require 'cgi'
require 'action_view/helpers/date_helper'
require 'action_view/helpers/tag_helper'
require 'action_view/helpers/form_tag_helper'
require 'active_support/core_ext/class/attribute'
require 'active_support/core_ext/hash/slice'
require 'active_support/core_ext/module/method_names'
require 'active_support/core_ext/object/blank'
require 'active_support/core_ext/string/output_safety'
require 'active_support/core_ext/array/extract_options'
module ActionView
# = Action View Form Helpers
module Helpers
# Form helpers are designed to make working with resources much easier
# compared to using vanilla HTML.
#
# Forms for models are created with +form_for+. That method yields a form
# builder that knows the model the form is about. The form builder is thus
# able to generate default values for input fields that correspond to model
# attributes, and also convenient names, IDs, endpoints, etc.
#
# Conventions in the generated field names allow controllers to receive form
# data nicely structured in +params+ with no effort on your side.
#
# For example, to create a new person you typically set up a new instance of
# +Person+ in the <tt>PeopleController#new</tt> action, <tt>@person</tt>, and
# pass it to +form_for+:
#
# <%= form_for @person do |f| %>
# <%= f.label :first_name %>:
# <%= f.text_field :first_name %><br />
#
# <%= f.label :last_name %>:
# <%= f.text_field :last_name %><br />
#
# <%= f.submit %>
# <% end %>
#
# The HTML generated for this would be (modulus formatting):
#
# <form action="/people" class="new_person" id="new_person" method="post">
# <div style="margin:0;padding:0;display:inline">
# <input name="authenticity_token" type="hidden" value="NrOp5bsjoLRuK8IW5+dQEYjKGUJDe7TQoZVvq95Wteg=" />
# </div>
# <label for="person_first_name">First name</label>:
# <input id="person_first_name" name="person[first_name]" size="30" type="text" /><br />
#
# <label for="person_last_name">Last name</label>:
# <input id="person_last_name" name="person[last_name]" size="30" type="text" /><br />
#
# <input name="commit" type="submit" value="Create Person" />
# </form>
#
# As you see, the HTML reflects knowledge about the resource in several spots,
# like the path the form should be submitted to, or the names of the input fields.
#
# In particular, thanks to the conventions followed in the generated field names, the
# controller gets a nested hash <tt>params[:person]</tt> with the person attributes
# set in the form. That hash is ready to be passed to <tt>Person.create</tt>:
#
# if @person = Person.create(params[:person])
# # success
# else
# # error handling
# end
#
# Interestingly, the exact same view code in the previous example can be used to edit
# a person. If <tt>@person</tt> is an existing record with name "John Smith" and ID 256,
# the code above as is would yield instead:
#
# <form action="/people/256" class="edit_person" id="edit_person_256" method="post">
# <div style="margin:0;padding:0;display:inline">
# <input name="_method" type="hidden" value="put" />
# <input name="authenticity_token" type="hidden" value="NrOp5bsjoLRuK8IW5+dQEYjKGUJDe7TQoZVvq95Wteg=" />
# </div>
# <label for="person_first_name">First name</label>:
# <input id="person_first_name" name="person[first_name]" size="30" type="text" value="John" /><br />
#
# <label for="person_last_name">Last name</label>:
# <input id="person_last_name" name="person[last_name]" size="30" type="text" value="Smith" /><br />
#
# <input name="commit" type="submit" value="Update Person" />
# </form>
#
# Note that the endpoint, default values, and submit button label are tailored for <tt>@person</tt>.
# That works that way because the involved helpers know whether the resource is a new record or not,
# and generate HTML accordingly.
#
# The controller would receive the form data again in <tt>params[:person]</tt>, ready to be
# passed to <tt>Person#update_attributes</tt>:
#
# if @person.update_attributes(params[:person])
# # success
# else
# # error handling
# end
#
# That's how you typically work with resources.
module FormHelper
extend ActiveSupport::Concern
include FormTagHelper
include UrlHelper
# Converts the given object to an ActiveModel compliant one.
def convert_to_model(object)
object.respond_to?(:to_model) ? object.to_model : object
end
# Creates a form and a scope around a specific model object that is used
# as a base for questioning about values for the fields.
#
# Rails provides succinct resource-oriented form generation with +form_for+
# like this:
#
# <%= form_for @offer do |f| %>
# <%= f.label :version, 'Version' %>:
# <%= f.text_field :version %><br />
# <%= f.label :author, 'Author' %>:
# <%= f.text_field :author %><br />
# <%= f.submit %>
# <% end %>
#
# There, +form_for+ is able to generate the rest of RESTful form
# parameters based on introspection on the record, but to understand what
# it does we need to dig first into the alternative generic usage it is
# based upon.
#
# === Generic form_for
#
# The generic way to call +form_for+ yields a form builder around a
# model:
#
# <%= form_for :person do |f| %>
# First name: <%= f.text_field :first_name %><br />
# Last name : <%= f.text_field :last_name %><br />
# Biography : <%= f.text_area :biography %><br />
# Admin? : <%= f.check_box :admin %><br />
# <%= f.submit %>
# <% end %>
#
# There, the argument is a symbol or string with the name of the
# object the form is about.
#
# The form builder acts as a regular form helper that somehow carries the
# model. Thus, the idea is that
#
# <%= f.text_field :first_name %>
#
# gets expanded to
#
# <%= text_field :person, :first_name %>
#
# The rightmost argument to +form_for+ is an
# optional hash of options:
#
# * <tt>:url</tt> - The URL the form is submitted to. It takes the same
# fields you pass to +url_for+ or +link_to+. In particular you may pass
# here a named route directly as well. Defaults to the current action.
# * <tt>:html</tt> - Optional HTML attributes for the form tag.
#
# Also note that +form_for+ doesn't create an exclusive scope. It's still
# possible to use both the stand-alone FormHelper methods and methods
# from FormTagHelper. For example:
#
# <%= form_for @person do |f| %>
# First name: <%= f.text_field :first_name %>
# Last name : <%= f.text_field :last_name %>
# Biography : <%= text_area :person, :biography %>
# Admin? : <%= check_box_tag "person[admin]", @person.company.admin? %>
# <%= f.submit %>
# <% end %>
#
# This also works for the methods in FormOptionHelper and DateHelper that
# are designed to work with an object as base, like
# FormOptionHelper#collection_select and DateHelper#datetime_select.
#
# === Resource-oriented style
#
# As we said above, in addition to manually configuring the +form_for+
# call, you can rely on automated resource identification, which will use
# the conventions and named routes of that approach. This is the
# preferred way to use +form_for+ nowadays.
#
# For example, if <tt>@post</tt> is an existing record you want to edit
#
# <%= form_for @post do |f| %>
# ...
# <% end %>
#
# is equivalent to something like:
#
# <%= form_for @post, :as => :post, :url => post_path(@post), :method => :put, :html => { :class => "edit_post", :id => "edit_post_45" } do |f| %>
# ...
# <% end %>
#
# And for new records
#
# <%= form_for(Post.new) do |f| %>
# ...
# <% end %>
#
# is equivalent to something like:
#
# <%= form_for @post, :as => :post, :url => posts_path, :html => { :class => "new_post", :id => "new_post" } do |f| %>
# ...
# <% end %>
#
# You can also overwrite the individual conventions, like this:
#
# <%= form_for(@post, :url => super_posts_path) do |f| %>
# ...
# <% end %>
#
# You can also set the answer format, like this:
#
# <%= form_for(@post, :format => :json) do |f| %>
# ...
# <% end %>
#
# If you have an object that needs to be represented as a different
# parameter, like a Person that acts as a Client:
#
# <%= form_for(@person, :as => :client) do |f| %>
# ...
# <% end %>
#
# For namespaced routes, like +admin_post_url+:
#
# <%= form_for([:admin, @post]) do |f| %>
# ...
# <% end %>
#
# If your resource has associations defined, for example, you want to add comments
# to the document given that the routes are set correctly:
#
# <%= form_for([@document, @comment]) do |f| %>
# ...
# <% end %>
#
# Where <tt>@document = Document.find(params[:id])</tt> and
# <tt>@comment = Comment.new</tt>.
#
# === Setting the method
#
# You can force the form to use the full array of HTTP verbs by setting
#
# :method => (:get|:post|:put|:delete)
#
# in the options hash. If the verb is not GET or POST, which are natively supported by HTML forms, the
# form will be set to POST and a hidden input called _method will carry the intended verb for the server
# to interpret.
#
# === Unobtrusive JavaScript
#
# Specifying:
#
# :remote => true
#
# in the options hash creates a form that will allow the unobtrusive JavaScript drivers to modify its
# behavior. The expected default behavior is an XMLHttpRequest in the background instead of the regular
# POST arrangement, but ultimately the behavior is the choice of the JavaScript driver implementor.
# Even though it's using JavaScript to serialize the form elements, the form submission will work just like
# a regular submission as viewed by the receiving side (all elements available in <tt>params</tt>).
#
# Example:
#
# <%= form_for(@post, :remote => true) do |f| %>
# ...
# <% end %>
#
# The HTML generated for this would be:
#
# <form action='http://www.example.com' method='post' data-remote='true'>
# <div style='margin:0;padding:0;display:inline'>
# <input name='_method' type='hidden' value='put' />
# </div>
# ...
# </form>
#
# === Removing hidden model id's
#
# The form_for method automatically includes the model id as a hidden field in the form.
# This is used to maintain the correlation between the form data and its associated model.
# Some ORM systems do not use IDs on nested models so in this case you want to be able
# to disable the hidden id.
#
# In the following example the Post model has many Comments stored within it in a NoSQL database,
# thus there is no primary key for comments.
#
# Example:
#
# <%= form_for(@post) do |f| %>
# <% f.fields_for(:comments, :include_id => false) do |cf| %>
# ...
# <% end %>
# <% end %>
#
# === Customized form builders
#
# You can also build forms using a customized FormBuilder class. Subclass
# FormBuilder and override or define some more helpers, then use your
# custom builder. For example, let's say you made a helper to
# automatically add labels to form inputs.
#
# <%= form_for @person, :url => { :action => "create" }, :builder => LabellingFormBuilder do |f| %>
# <%= f.text_field :first_name %>
# <%= f.text_field :last_name %>
# <%= f.text_area :biography %>
# <%= f.check_box :admin %>
# <%= f.submit %>
# <% end %>
#
# In this case, if you use this:
#
# <%= render f %>
#
# The rendered template is <tt>people/_labelling_form</tt> and the local
# variable referencing the form builder is called
# <tt>labelling_form</tt>.
#
# The custom FormBuilder class is automatically merged with the options
# of a nested fields_for call, unless it's explicitly set.
#
# In many cases you will want to wrap the above in another helper, so you
# could do something like the following:
#
# def labelled_form_for(record_or_name_or_array, *args, &proc)
# options = args.extract_options!
# form_for(record_or_name_or_array, *(args << options.merge(:builder => LabellingFormBuilder)), &proc)
# end
#
# If you don't need to attach a form to a model instance, then check out
# FormTagHelper#form_tag.
#
# === Form to external resources
#
# When you build forms to external resources sometimes you need to set an authenticity token or just render a form
# without it, for example when you submit data to a payment gateway number and types of fields could be limited.
#
# To set an authenticity token you need to pass an <tt>:authenticity_token</tt> parameter
#
# <%= form_for @invoice, :url => external_url, :authenticity_token => 'external_token' do |f|
# ...
# <% end %>
#
# If you don't want to an authenticity token field be rendered at all just pass <tt>false</tt>:
#
# <%= form_for @invoice, :url => external_url, :authenticity_token => false do |f|
# ...
# <% end %>
def form_for(record, options = {}, &proc)
raise ArgumentError, "Missing block" unless block_given?
options[:html] ||= {}
case record
when String, Symbol
object_name = record
object = nil
else
object = record.is_a?(Array) ? record.last : record
object_name = options[:as] || ActiveModel::Naming.param_key(object)
apply_form_for_options!(record, options)
end
options[:html][:remote] = options.delete(:remote) if options.has_key?(:remote)
options[:html][:method] = options.delete(:method) if options.has_key?(:method)
options[:html][:authenticity_token] = options.delete(:authenticity_token)
builder = options[:parent_builder] = instantiate_builder(object_name, object, options, &proc)
fields_for = fields_for(object_name, object, options, &proc)
default_options = builder.multipart? ? { :multipart => true } : {}
output = form_tag(options.delete(:url) || {}, default_options.merge!(options.delete(:html)))
output << fields_for
output.safe_concat('</form>')
end
def apply_form_for_options!(object_or_array, options) #:nodoc:
object = object_or_array.is_a?(Array) ? object_or_array.last : object_or_array
object = convert_to_model(object)
as = options[:as]
action, method = object.respond_to?(:persisted?) && object.persisted? ? [:edit, :put] : [:new, :post]
options[:html].reverse_merge!(
:class => as ? "#{as}_#{action}" : dom_class(object, action),
:id => as ? "#{as}_#{action}" : dom_id(object, action),
:method => method
)
options[:url] ||= polymorphic_path(object_or_array, :format => options.delete(:format))
end
private :apply_form_for_options!
# Creates a scope around a specific model object like form_for, but
# doesn't create the form tags themselves. This makes fields_for suitable
# for specifying additional model objects in the same form.
#
# === Generic Examples
#
# <%= form_for @person do |person_form| %>
# First name: <%= person_form.text_field :first_name %>
# Last name : <%= person_form.text_field :last_name %>
#
# <%= fields_for @person.permission do |permission_fields| %>
# Admin? : <%= permission_fields.check_box :admin %>
# <% end %>
#
# <%= f.submit %>
# <% end %>
#
# ...or if you have an object that needs to be represented as a different
# parameter, like a Client that acts as a Person:
#
# <%= fields_for :person, @client do |permission_fields| %>
# Admin?: <%= permission_fields.check_box :admin %>
# <% end %>
#
# ...or if you don't have an object, just a name of the parameter:
#
# <%= fields_for :person do |permission_fields| %>
# Admin?: <%= permission_fields.check_box :admin %>
# <% end %>
#
# Note: This also works for the methods in FormOptionHelper and
# DateHelper that are designed to work with an object as base, like
# FormOptionHelper#collection_select and DateHelper#datetime_select.
#
# === Nested Attributes Examples
#
# When the object belonging to the current scope has a nested attribute
# writer for a certain attribute, fields_for will yield a new scope
# for that attribute. This allows you to create forms that set or change
# the attributes of a parent object and its associations in one go.
#
# Nested attribute writers are normal setter methods named after an
# association. The most common way of defining these writers is either
# with +accepts_nested_attributes_for+ in a model definition or by
# defining a method with the proper name. For example: the attribute
# writer for the association <tt>:address</tt> is called
# <tt>address_attributes=</tt>.
#
# Whether a one-to-one or one-to-many style form builder will be yielded
# depends on whether the normal reader method returns a _single_ object
# or an _array_ of objects.
#
# ==== One-to-one
#
# Consider a Person class which returns a _single_ Address from the
# <tt>address</tt> reader method and responds to the
# <tt>address_attributes=</tt> writer method:
#
# class Person
# def address
# @address
# end
#
# def address_attributes=(attributes)
# # Process the attributes hash
# end
# end
#
# This model can now be used with a nested fields_for, like so:
#
# <%= form_for @person do |person_form| %>
# ...
# <%= person_form.fields_for :address do |address_fields| %>
# Street : <%= address_fields.text_field :street %>
# Zip code: <%= address_fields.text_field :zip_code %>
# <% end %>
# ...
# <% end %>
#
# When address is already an association on a Person you can use
# +accepts_nested_attributes_for+ to define the writer method for you:
#
# class Person < ActiveRecord::Base
# has_one :address
# accepts_nested_attributes_for :address
# end
#
# If you want to destroy the associated model through the form, you have
# to enable it first using the <tt>:allow_destroy</tt> option for
# +accepts_nested_attributes_for+:
#
# class Person < ActiveRecord::Base
# has_one :address
# accepts_nested_attributes_for :address, :allow_destroy => true
# end
#
# Now, when you use a form element with the <tt>_destroy</tt> parameter,
# with a value that evaluates to +true+, you will destroy the associated
# model (eg. 1, '1', true, or 'true'):
#
# <%= form_for @person do |person_form| %>
# ...
# <%= person_form.fields_for :address do |address_fields| %>
# ...
# Delete: <%= address_fields.check_box :_destroy %>
# <% end %>
# ...
# <% end %>
#
# ==== One-to-many
#
# Consider a Person class which returns an _array_ of Project instances
# from the <tt>projects</tt> reader method and responds to the
# <tt>projects_attributes=</tt> writer method:
#
# class Person
# def projects
# [@project1, @project2]
# end
#
# def projects_attributes=(attributes)
# # Process the attributes hash
# end
# end
#
# Note that the <tt>projects_attributes=</tt> writer method is in fact
# required for fields_for to correctly identify <tt>:projects</tt> as a
# collection, and the correct indices to be set in the form markup.
#
# When projects is already an association on Person you can use
# +accepts_nested_attributes_for+ to define the writer method for you:
#
# class Person < ActiveRecord::Base
# has_many :projects
# accepts_nested_attributes_for :projects
# end
#
# This model can now be used with a nested fields_for. The block given to
# the nested fields_for call will be repeated for each instance in the
# collection:
#
# <%= form_for @person do |person_form| %>
# ...
# <%= person_form.fields_for :projects do |project_fields| %>
# <% if project_fields.object.active? %>
# Name: <%= project_fields.text_field :name %>
# <% end %>
# <% end %>
# ...
# <% end %>
#
# It's also possible to specify the instance to be used:
#
# <%= form_for @person do |person_form| %>
# ...
# <% @person.projects.each do |project| %>
# <% if project.active? %>
# <%= person_form.fields_for :projects, project do |project_fields| %>
# Name: <%= project_fields.text_field :name %>
# <% end %>
# <% end %>
# <% end %>
# ...
# <% end %>
#
# Or a collection to be used:
#
# <%= form_for @person do |person_form| %>
# ...
# <%= person_form.fields_for :projects, @active_projects do |project_fields| %>
# Name: <%= project_fields.text_field :name %>
# <% end %>
# ...
# <% end %>
#
# When projects is already an association on Person you can use
# +accepts_nested_attributes_for+ to define the writer method for you:
#
# class Person < ActiveRecord::Base
# has_many :projects
# accepts_nested_attributes_for :projects
# end
#
# If you want to destroy any of the associated models through the
# form, you have to enable it first using the <tt>:allow_destroy</tt>
# option for +accepts_nested_attributes_for+:
#
# class Person < ActiveRecord::Base
# has_many :projects
# accepts_nested_attributes_for :projects, :allow_destroy => true
# end
#
# This will allow you to specify which models to destroy in the
# attributes hash by adding a form element for the <tt>_destroy</tt>
# parameter with a value that evaluates to +true+
# (eg. 1, '1', true, or 'true'):
#
# <%= form_for @person do |person_form| %>
# ...
# <%= person_form.fields_for :projects do |project_fields| %>
# Delete: <%= project_fields.check_box :_destroy %>
# <% end %>
# ...
# <% end %>
def fields_for(record_name, record_object = nil, options = {}, &block)
builder = instantiate_builder(record_name, record_object, options, &block)
output = capture(builder, &block)
output.concat builder.hidden_field(:id) if output && options[:hidden_field_id] && !builder.emitted_hidden_id?
output
end
# Returns a label tag tailored for labelling an input field for a specified attribute (identified by +method+) on an object
# assigned to the template (identified by +object+). The text of label will default to the attribute name unless a translation
# is found in the current I18n locale (through helpers.label.<modelname>.<attribute>) or you specify it explicitly.
# Additional options on the label tag can be passed as a hash with +options+. These options will be tagged
# onto the HTML as an HTML element attribute as in the example shown, except for the <tt>:value</tt> option, which is designed to
# target labels for radio_button tags (where the value is used in the ID of the input tag).
#
# ==== Examples
# label(:post, :title)
# # => <label for="post_title">Title</label>
#
# You can localize your labels based on model and attribute names.
# For example you can define the following in your locale (e.g. en.yml)
#
# helpers:
# label:
# post:
# body: "Write your entire text here"
#
# Which then will result in
#
# label(:post, :body)
# # => <label for="post_body">Write your entire text here</label>
#
# Localization can also be based purely on the translation of the attribute-name
# (if you are using ActiveRecord):
#
# activerecord:
# attributes:
# post:
# cost: "Total cost"
#
# label(:post, :cost)
# # => <label for="post_cost">Total cost</label>
#
# label(:post, :title, "A short title")
# # => <label for="post_title">A short title</label>
#
# label(:post, :title, "A short title", :class => "title_label")
# # => <label for="post_title" class="title_label">A short title</label>
#
# label(:post, :privacy, "Public Post", :value => "public")
# # => <label for="post_privacy_public">Public Post</label>
#
# label(:post, :terms) do
# 'Accept <a href="/terms">Terms</a>.'
# end
def label(object_name, method, content_or_options = nil, options = nil, &block)
content_is_options = content_or_options.is_a?(Hash)
if content_is_options || block_given?
options = content_or_options if content_is_options
text = nil
else
text = content_or_options
end
options ||= {}
InstanceTag.new(object_name, method, self, options.delete(:object)).to_label_tag(text, options, &block)
end
# Returns an input tag of the "text" type tailored for accessing a specified attribute (identified by +method+) on an object
# assigned to the template (identified by +object+). Additional options on the input tag can be passed as a
# hash with +options+. These options will be tagged onto the HTML as an HTML element attribute as in the example
# shown.
#
# ==== Examples
# text_field(:post, :title, :size => 20)
# # => <input type="text" id="post_title" name="post[title]" size="20" value="#{@post.title}" />
#
# text_field(:post, :title, :class => "create_input")
# # => <input type="text" id="post_title" name="post[title]" value="#{@post.title}" class="create_input" />
#
# text_field(:session, :user, :onchange => "if $('session[user]').value == 'admin' { alert('Your login can not be admin!'); }")
# # => <input type="text" id="session_user" name="session[user]" value="#{@session.user}" onchange = "if $('session[user]').value == 'admin' { alert('Your login can not be admin!'); }"/>
#
# text_field(:snippet, :code, :size => 20, :class => 'code_input')
# # => <input type="text" id="snippet_code" name="snippet[code]" size="20" value="#{@snippet.code}" class="code_input" />
#
def text_field(object_name, method, options = {})
InstanceTag.new(object_name, method, self, options.delete(:object)).to_input_field_tag("text", options)
end
# Returns an input tag of the "password" type tailored for accessing a specified attribute (identified by +method+) on an object
# assigned to the template (identified by +object+). Additional options on the input tag can be passed as a
# hash with +options+. These options will be tagged onto the HTML as an HTML element attribute as in the example
# shown.
#
# ==== Examples
# password_field(:login, :pass, :size => 20)
# # => <input type="password" id="login_pass" name="login[pass]" size="20" />
#
# password_field(:account, :secret, :class => "form_input", :value => @account.secret)
# # => <input type="password" id="account_secret" name="account[secret]" value="#{@account.secret}" class="form_input" />
#
# password_field(:user, :password, :onchange => "if $('user[password]').length > 30 { alert('Your password needs to be shorter!'); }")
# # => <input type="password" id="user_password" name="user[password]" onchange = "if $('user[password]').length > 30 { alert('Your password needs to be shorter!'); }"/>
#
# password_field(:account, :pin, :size => 20, :class => 'form_input')
# # => <input type="password" id="account_pin" name="account[pin]" size="20" class="form_input" />
#
def password_field(object_name, method, options = {})
InstanceTag.new(object_name, method, self, options.delete(:object)).to_input_field_tag("password", { :value => nil }.merge!(options))
end
# Returns a hidden input tag tailored for accessing a specified attribute (identified by +method+) on an object
# assigned to the template (identified by +object+). Additional options on the input tag can be passed as a
# hash with +options+. These options will be tagged onto the HTML as an HTML element attribute as in the example
# shown.
#
# ==== Examples
# hidden_field(:signup, :pass_confirm)
# # => <input type="hidden" id="signup_pass_confirm" name="signup[pass_confirm]" value="#{@signup.pass_confirm}" />
#
# hidden_field(:post, :tag_list)
# # => <input type="hidden" id="post_tag_list" name="post[tag_list]" value="#{@post.tag_list}" />
#
# hidden_field(:user, :token)
# # => <input type="hidden" id="user_token" name="user[token]" value="#{@user.token}" />
def hidden_field(object_name, method, options = {})
InstanceTag.new(object_name, method, self, options.delete(:object)).to_input_field_tag("hidden", options)
end
# Returns a file upload input tag tailored for accessing a specified attribute (identified by +method+) on an object
# assigned to the template (identified by +object+). Additional options on the input tag can be passed as a
# hash with +options+. These options will be tagged onto the HTML as an HTML element attribute as in the example
# shown.
#
# Using this method inside a +form_for+ block will set the enclosing form's encoding to <tt>multipart/form-data</tt>.
#
# ==== Examples
# file_field(:user, :avatar)
# # => <input type="file" id="user_avatar" name="user[avatar]" />
#
# file_field(:post, :attached, :accept => 'text/html')
# # => <input type="file" id="post_attached" name="post[attached]" />
#
# file_field(:attachment, :file, :class => 'file_input')
# # => <input type="file" id="attachment_file" name="attachment[file]" class="file_input" />
#
def file_field(object_name, method, options = {})
InstanceTag.new(object_name, method, self, options.delete(:object)).to_input_field_tag("file", options.update({:size => nil}))
end
# Returns a textarea opening and closing tag set tailored for accessing a specified attribute (identified by +method+)
# on an object assigned to the template (identified by +object+). Additional options on the input tag can be passed as a
# hash with +options+.
#
# ==== Examples
# text_area(:post, :body, :cols => 20, :rows => 40)
# # => <textarea cols="20" rows="40" id="post_body" name="post[body]">
# # #{@post.body}
# # </textarea>
#
# text_area(:comment, :text, :size => "20x30")
# # => <textarea cols="20" rows="30" id="comment_text" name="comment[text]">
# # #{@comment.text}
# # </textarea>
#
# text_area(:application, :notes, :cols => 40, :rows => 15, :class => 'app_input')
# # => <textarea cols="40" rows="15" id="application_notes" name="application[notes]" class="app_input">
# # #{@application.notes}
# # </textarea>
#
# text_area(:entry, :body, :size => "20x20", :disabled => 'disabled')
# # => <textarea cols="20" rows="20" id="entry_body" name="entry[body]" disabled="disabled">
# # #{@entry.body}
# # </textarea>
def text_area(object_name, method, options = {})
InstanceTag.new(object_name, method, self, options.delete(:object)).to_text_area_tag(options)
end
# Returns a checkbox tag tailored for accessing a specified attribute (identified by +method+) on an object
# assigned to the template (identified by +object+). This object must be an instance object (@object) and not a local object.
# It's intended that +method+ returns an integer and if that integer is above zero, then the checkbox is checked.
# Additional options on the input tag can be passed as a hash with +options+. The +checked_value+ defaults to 1
# while the default +unchecked_value+ is set to 0 which is convenient for boolean values.
#
# ==== Gotcha
#
# The HTML specification says unchecked check boxes are not successful, and
# thus web browsers do not send them. Unfortunately this introduces a gotcha:
# if an +Invoice+ model has a +paid+ flag, and in the form that edits a paid
# invoice the user unchecks its check box, no +paid+ parameter is sent. So,
# any mass-assignment idiom like
#
# @invoice.update_attributes(params[:invoice])
#
# wouldn't update the flag.
#
# To prevent this the helper generates an auxiliary hidden field before
# the very check box. The hidden field has the same name and its
# attributes mimic an unchecked check box.
#
# This way, the client either sends only the hidden field (representing
# the check box is unchecked), or both fields. Since the HTML specification
# says key/value pairs have to be sent in the same order they appear in the
# form, and parameters extraction gets the last occurrence of any repeated
# key in the query string, that works for ordinary forms.
#
# Unfortunately that workaround does not work when the check box goes
# within an array-like parameter, as in
#
# <%= fields_for "project[invoice_attributes][]", invoice, :index => nil do |form| %>
# <%= form.check_box :paid %>
# ...
# <% end %>
#
# because parameter name repetition is precisely what Rails seeks to distinguish
# the elements of the array. For each item with a checked check box you
# get an extra ghost item with only that attribute, assigned to "0".
#
# In that case it is preferable to either use +check_box_tag+ or to use
# hashes instead of arrays.
#
# ==== Examples
# # Let's say that @post.validated? is 1:
# check_box("post", "validated")
# # => <input name="post[validated]" type="hidden" value="0" />
# # <input type="checkbox" id="post_validated" name="post[validated]" value="1" />
#
# # Let's say that @puppy.gooddog is "no":
# check_box("puppy", "gooddog", {}, "yes", "no")
# # => <input name="puppy[gooddog]" type="hidden" value="no" />
# # <input type="checkbox" id="puppy_gooddog" name="puppy[gooddog]" value="yes" />
#
# check_box("eula", "accepted", { :class => 'eula_check' }, "yes", "no")
# # => <input name="eula[accepted]" type="hidden" value="no" />
# # <input type="checkbox" class="eula_check" id="eula_accepted" name="eula[accepted]" value="yes" />
#
def check_box(object_name, method, options = {}, checked_value = "1", unchecked_value = "0")
InstanceTag.new(object_name, method, self, options.delete(:object)).to_check_box_tag(options, checked_value, unchecked_value)
end
# Returns a radio button tag for accessing a specified attribute (identified by +method+) on an object
# assigned to the template (identified by +object+). If the current value of +method+ is +tag_value+ the
# radio button will be checked.
#
# To force the radio button to be checked pass <tt>:checked => true</tt> in the
# +options+ hash. You may pass HTML options there as well.
#
# ==== Examples
# # Let's say that @post.category returns "rails":
# radio_button("post", "category", "rails")
# radio_button("post", "category", "java")
# # => <input type="radio" id="post_category_rails" name="post[category]" value="rails" checked="checked" />
# # <input type="radio" id="post_category_java" name="post[category]" value="java" />
#
# radio_button("user", "receive_newsletter", "yes")
# radio_button("user", "receive_newsletter", "no")
# # => <input type="radio" id="user_receive_newsletter_yes" name="user[receive_newsletter]" value="yes" />
# # <input type="radio" id="user_receive_newsletter_no" name="user[receive_newsletter]" value="no" checked="checked" />
def radio_button(object_name, method, tag_value, options = {})
InstanceTag.new(object_name, method, self, options.delete(:object)).to_radio_button_tag(tag_value, options)
end
# Returns an input of type "search" for accessing a specified attribute (identified by +method+) on an object
# assigned to the template (identified by +object_name+). Inputs of type "search" may be styled differently by
# some browsers.
#
# ==== Examples
#
# search_field(:user, :name)
# # => <input id="user_name" name="user[name]" size="30" type="search" />
# search_field(:user, :name, :autosave => false)
# # => <input autosave="false" id="user_name" name="user[name]" size="30" type="search" />
# search_field(:user, :name, :results => 3)
# # => <input id="user_name" name="user[name]" results="3" size="30" type="search" />
# # Assume request.host returns "www.example.com"
# search_field(:user, :name, :autosave => true)
# # => <input autosave="com.example.www" id="user_name" name="user[name]" results="10" size="30" type="search" />
# search_field(:user, :name, :onsearch => true)
# # => <input id="user_name" incremental="true" name="user[name]" onsearch="true" size="30" type="search" />
# search_field(:user, :name, :autosave => false, :onsearch => true)
# # => <input autosave="false" id="user_name" incremental="true" name="user[name]" onsearch="true" size="30" type="search" />
# search_field(:user, :name, :autosave => true, :onsearch => true)
# # => <input autosave="com.example.www" id="user_name" incremental="true" name="user[name]" onsearch="true" results="10" size="30" type="search" />
#
def search_field(object_name, method, options = {})
options = options.stringify_keys
if options["autosave"]
if options["autosave"] == true
options["autosave"] = request.host.split(".").reverse.join(".")
end
options["results"] ||= 10
end
if options["onsearch"]
options["incremental"] = true unless options.has_key?("incremental")
end
InstanceTag.new(object_name, method, self, options.delete("object")).to_input_field_tag("search", options)
end
# Returns a text_field of type "tel".
#
# telephone_field("user", "phone")
# # => <input id="user_phone" name="user[phone]" size="30" type="tel" />
#
def telephone_field(object_name, method, options = {})
InstanceTag.new(object_name, method, self, options.delete(:object)).to_input_field_tag("tel", options)
end
alias phone_field telephone_field
# Returns a text_field of type "url".
#
# url_field("user", "homepage")
# # => <input id="user_homepage" size="30" name="user[homepage]" type="url" />
#
def url_field(object_name, method, options = {})
InstanceTag.new(object_name, method, self, options.delete(:object)).to_input_field_tag("url", options)
end
# Returns a text_field of type "email".
#
# email_field("user", "address")
# # => <input id="user_address" size="30" name="user[address]" type="email" />
#
def email_field(object_name, method, options = {})
InstanceTag.new(object_name, method, self, options.delete(:object)).to_input_field_tag("email", options)
end
# Returns an input tag of type "number".
#
# ==== Options
# * Accepts same options as number_field_tag
def number_field(object_name, method, options = {})
InstanceTag.new(object_name, method, self, options.delete(:object)).to_number_field_tag("number", options)
end
# Returns an input tag of type "range".
#
# ==== Options
# * Accepts same options as range_field_tag
def range_field(object_name, method, options = {})
InstanceTag.new(object_name, method, self, options.delete(:object)).to_number_field_tag("range", options)
end
private
def instantiate_builder(record_name, record_object, options, &block)
case record_name
when String, Symbol
object = record_object
object_name = record_name
else
object = record_name
object_name = ActiveModel::Naming.param_key(object)
end
builder = options[:builder] || ActionView::Base.default_form_builder
builder.new(object_name, object, self, options, block)
end
end
class InstanceTag
include Helpers::CaptureHelper, Context, Helpers::TagHelper, Helpers::FormTagHelper
attr_reader :object, :method_name, :object_name
DEFAULT_FIELD_OPTIONS = { "size" => 30 }
DEFAULT_RADIO_OPTIONS = { }
DEFAULT_TEXT_AREA_OPTIONS = { "cols" => 40, "rows" => 20 }
def initialize(object_name, method_name, template_object, object = nil)
@object_name, @method_name = object_name.to_s.dup, method_name.to_s.dup
@template_object = template_object
@object_name.sub!(/\[\]$/,"") || @object_name.sub!(/\[\]\]$/,"]")
@object = retrieve_object(object)
@auto_index = retrieve_autoindex(Regexp.last_match.pre_match) if Regexp.last_match
end
def to_label_tag(text = nil, options = {}, &block)
options = options.stringify_keys
tag_value = options.delete("value")
name_and_id = options.dup
if name_and_id["for"]
name_and_id["id"] = name_and_id["for"]
else
name_and_id.delete("id")
end
add_default_name_and_id_for_value(tag_value, name_and_id)
options.delete("index")
options["for"] ||= name_and_id["id"]
if block_given?
label_tag(name_and_id["id"], options, &block)
else
content = if text.blank?
method_and_value = tag_value.present? ? "#{method_name}.#{tag_value}" : method_name
I18n.t("helpers.label.#{object_name}.#{method_and_value}", :default => "").presence
else
text.to_s
end
content ||= if object && object.class.respond_to?(:human_attribute_name)
object.class.human_attribute_name(method_name)
end
content ||= method_name.humanize
label_tag(name_and_id["id"], content, options)
end
end
def to_input_field_tag(field_type, options = {})
options = options.stringify_keys
options["size"] = options["maxlength"] || DEFAULT_FIELD_OPTIONS["size"] unless options.key?("size")
options = DEFAULT_FIELD_OPTIONS.merge(options)
if field_type == "hidden"
options.delete("size")
end
options["type"] ||= field_type
options["value"] = options.fetch("value"){ value_before_type_cast(object) } unless field_type == "file"
options["value"] &&= ERB::Util.html_escape(options["value"])
add_default_name_and_id(options)
tag("input", options)
end
def to_number_field_tag(field_type, options = {})
options = options.stringify_keys
if range = options.delete("in") || options.delete("within")
options.update("min" => range.min, "max" => range.max)
end
to_input_field_tag(field_type, options)
end
def to_radio_button_tag(tag_value, options = {})
options = DEFAULT_RADIO_OPTIONS.merge(options.stringify_keys)
options["type"] = "radio"
options["value"] = tag_value
if options.has_key?("checked")
cv = options.delete "checked"
checked = cv == true || cv == "checked"
else
checked = self.class.radio_button_checked?(value(object), tag_value)
end
options["checked"] = "checked" if checked
add_default_name_and_id_for_value(tag_value, options)
tag("input", options)
end
def to_text_area_tag(options = {})
options = DEFAULT_TEXT_AREA_OPTIONS.merge(options.stringify_keys)
add_default_name_and_id(options)
if size = options.delete("size")
options["cols"], options["rows"] = size.split("x") if size.respond_to?(:split)
end
content_tag("textarea", ERB::Util.html_escape(options.delete('value') || value_before_type_cast(object)), options)
end
def to_check_box_tag(options = {}, checked_value = "1", unchecked_value = "0")
options = options.stringify_keys
options["type"] = "checkbox"
options["value"] = checked_value
if options.has_key?("checked")
cv = options.delete "checked"
checked = cv == true || cv == "checked"
else
checked = self.class.check_box_checked?(value(object), checked_value)
end
options["checked"] = "checked" if checked
if options["multiple"]
add_default_name_and_id_for_value(checked_value, options)
options.delete("multiple")
else
add_default_name_and_id(options)
end
hidden = tag("input", "name" => options["name"], "type" => "hidden", "value" => options['disabled'] && checked ? checked_value : unchecked_value)
checkbox = tag("input", options)
(hidden + checkbox).html_safe
end
def to_boolean_select_tag(options = {})
options = options.stringify_keys
add_default_name_and_id(options)
value = value(object)
tag_text = "<select"
tag_text << tag_options(options)
tag_text << "><option value=\"false\""
tag_text << " selected" if value == false
tag_text << ">False</option><option value=\"true\""
tag_text << " selected" if value
tag_text << ">True</option></select>"
end
def to_content_tag(tag_name, options = {})
content_tag(tag_name, value(object), options)
end
def retrieve_object(object)
if object
object
elsif @template_object.instance_variable_defined?("@#{@object_name}")
@template_object.instance_variable_get("@#{@object_name}")
end
rescue NameError
# As @object_name may contain the nested syntax (item[subobject]) we need to fallback to nil.
nil
end
def retrieve_autoindex(pre_match)
object = self.object || @template_object.instance_variable_get("@#{pre_match}")
if object && object.respond_to?(:to_param)
object.to_param
else
raise ArgumentError, "object[] naming but object param and @object var don't exist or don't respond to to_param: #{object.inspect}"
end
end
def value(object)
self.class.value(object, @method_name)
end
def value_before_type_cast(object)
self.class.value_before_type_cast(object, @method_name)
end
class << self
def value(object, method_name)
object.send method_name if object
end
def value_before_type_cast(object, method_name)
unless object.nil?
object.respond_to?(method_name + "_before_type_cast") ?
object.send(method_name + "_before_type_cast") :
object.send(method_name)
end
end
def check_box_checked?(value, checked_value)
case value
when TrueClass, FalseClass
value
when NilClass
false
when Integer
value != 0
when String
value == checked_value
when Array
value.include?(checked_value)
else
value.to_i != 0
end
end
def radio_button_checked?(value, checked_value)
value.to_s == checked_value.to_s
end
end
private
def add_default_name_and_id_for_value(tag_value, options)
unless tag_value.nil?
pretty_tag_value = tag_value.to_s.gsub(/\s/, "_").gsub(/[^-\w]/, "").downcase
specified_id = options["id"]
add_default_name_and_id(options)
options["id"] += "_#{pretty_tag_value}" if specified_id.blank? && options["id"].present?
else
add_default_name_and_id(options)
end
end
def add_default_name_and_id(options)
if options.has_key?("index")
options["name"] ||= tag_name_with_index(options["index"])
options["id"] = options.fetch("id"){ tag_id_with_index(options["index"]) }
options.delete("index")
elsif defined?(@auto_index)
options["name"] ||= tag_name_with_index(@auto_index)
options["id"] = options.fetch("id"){ tag_id_with_index(@auto_index) }
else
options["name"] ||= tag_name + (options['multiple'] ? '[]' : '')
options["id"] = options.fetch("id"){ tag_id }
end
end
def tag_name
"#{@object_name}[#{sanitized_method_name}]"
end
def tag_name_with_index(index)
"#{@object_name}[#{index}][#{sanitized_method_name}]"
end
def tag_id
"#{sanitized_object_name}_#{sanitized_method_name}"
end
def tag_id_with_index(index)
"#{sanitized_object_name}_#{index}_#{sanitized_method_name}"
end
def sanitized_object_name
@sanitized_object_name ||= @object_name.gsub(/\]\[|[^-a-zA-Z0-9:.]/, "_").sub(/_$/, "")
end
def sanitized_method_name
@sanitized_method_name ||= @method_name.sub(/\?$/,"")
end
end
class FormBuilder
# The methods which wrap a form helper call.
class_attribute :field_helpers
self.field_helpers = FormHelper.instance_method_names - %w(form_for convert_to_model)
attr_accessor :object_name, :object, :options
attr_reader :multipart, :parent_builder
alias :multipart? :multipart
def multipart=(multipart)
@multipart = multipart
parent_builder.multipart = multipart if parent_builder
end
def self._to_partial_path
@_to_partial_path ||= name.demodulize.underscore.sub!(/_builder$/, '')
end
def to_partial_path
self.class._to_partial_path
end
def to_model
self
end
def initialize(object_name, object, template, options, proc)
@nested_child_index = {}
@object_name, @object, @template, @options, @proc = object_name, object, template, options, proc
@parent_builder = options[:parent_builder]
@default_options = @options ? @options.slice(:index) : {}
if @object_name.to_s.match(/\[\]$/)
if object ||= @template.instance_variable_get("@#{Regexp.last_match.pre_match}") and object.respond_to?(:to_param)
@auto_index = object.to_param
else
raise ArgumentError, "object[] naming but object param and @object var don't exist or don't respond to to_param: #{object.inspect}"
end
end
@multipart = nil
end
(field_helpers - %w(label check_box radio_button fields_for hidden_field file_field)).each do |selector|
class_eval <<-RUBY_EVAL, __FILE__, __LINE__ + 1
def #{selector}(method, options = {}) # def text_field(method, options = {})
@template.send( # @template.send(
#{selector.inspect}, # "text_field",
@object_name, # @object_name,
method, # method,
objectify_options(options)) # objectify_options(options))
end # end
RUBY_EVAL
end
def fields_for(record_name, record_object = nil, fields_options = {}, &block)
fields_options, record_object = record_object, nil if record_object.is_a?(Hash) && record_object.extractable_options?
fields_options[:builder] ||= options[:builder]
fields_options[:parent_builder] = self
case record_name
when String, Symbol
if nested_attributes_association?(record_name)
return fields_for_with_nested_attributes(record_name, record_object, fields_options, block)
end
else
record_object = record_name.is_a?(Array) ? record_name.last : record_name
record_name = ActiveModel::Naming.param_key(record_object)
end
index = if options.has_key?(:index)
"[#{options[:index]}]"
elsif defined?(@auto_index)
self.object_name = @object_name.to_s.sub(/\[\]$/,"")
"[#{@auto_index}]"
end
record_name = "#{object_name}#{index}[#{record_name}]"
@template.fields_for(record_name, record_object, fields_options, &block)
end
def label(method, text = nil, options = {}, &block)
@template.label(@object_name, method, text, objectify_options(options), &block)
end
def check_box(method, options = {}, checked_value = "1", unchecked_value = "0")
@template.check_box(@object_name, method, objectify_options(options), checked_value, unchecked_value)
end
def radio_button(method, tag_value, options = {})
@template.radio_button(@object_name, method, tag_value, objectify_options(options))
end
def hidden_field(method, options = {})
@emitted_hidden_id = true if method == :id
@template.hidden_field(@object_name, method, objectify_options(options))
end
def file_field(method, options = {})
self.multipart = true
@template.file_field(@object_name, method, objectify_options(options))
end
# Add the submit button for the given form. When no value is given, it checks
# if the object is a new resource or not to create the proper label:
#
# <%= form_for @post do |f| %>
# <%= f.submit %>
# <% end %>
#
# In the example above, if @post is a new record, it will use "Create Post" as
# submit button label, otherwise, it uses "Update Post".
#
# Those labels can be customized using I18n, under the helpers.submit key and accept
# the %{model} as translation interpolation:
#
# en:
# helpers:
# submit:
# create: "Create a %{model}"
# update: "Confirm changes to %{model}"
#
# It also searches for a key specific for the given object:
#
# en:
# helpers:
# submit:
# post:
# create: "Add %{model}"
#
def submit(value=nil, options={})
value, options = nil, value if value.is_a?(Hash)
value ||= submit_default_value
@template.submit_tag(value, options)
end
def emitted_hidden_id?
@emitted_hidden_id ||= nil
end
private
def objectify_options(options)
@default_options.merge(options.merge(:object => @object))
end
def submit_default_value
object = convert_to_model(@object)
key = object ? (object.persisted? ? :update : :create) : :submit
model = if object.class.respond_to?(:model_name)
object.class.model_name.human
else
@object_name.to_s.humanize
end
defaults = []
defaults << :"helpers.submit.#{object_name}.#{key}"
defaults << :"helpers.submit.#{key}"
defaults << "#{key.to_s.humanize} #{model}"
I18n.t(defaults.shift, :model => model, :default => defaults)
end
def nested_attributes_association?(association_name)
@object.respond_to?("#{association_name}_attributes=")
end
def fields_for_with_nested_attributes(association_name, association, options, block)
name = "#{object_name}[#{association_name}_attributes]"
association = convert_to_model(association)
if association.respond_to?(:persisted?)
association = [association] if @object.send(association_name).is_a?(Array)
elsif !association.respond_to?(:to_ary)
association = @object.send(association_name)
end
if association.respond_to?(:to_ary)
explicit_child_index = options[:child_index]
output = ActiveSupport::SafeBuffer.new
association.each do |child|
output << fields_for_nested_model("#{name}[#{explicit_child_index || nested_child_index(name)}]", child, options, block)
end
output
elsif association
fields_for_nested_model(name, association, options, block)
end
end
def fields_for_nested_model(name, object, options, block)
object = convert_to_model(object)
parent_include_id = self.options.fetch(:include_id, true)
include_id = options.fetch(:include_id, parent_include_id)
options[:hidden_field_id] = object.persisted? && include_id
@template.fields_for(name, object, options, &block)
end
def nested_child_index(name)
@nested_child_index[name] ||= -1
@nested_child_index[name] += 1
end
def convert_to_model(object)
object.respond_to?(:to_model) ? object.to_model : object
end
end
end
ActiveSupport.on_load(:action_view) do
class ActionView::Base
cattr_accessor :default_form_builder
@@default_form_builder = ::ActionView::Helpers::FormBuilder
end
end
end
