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 PeopleController#new action, @person, and # pass it to +form_for+: # # <%= form_for @person do |f| %> # <%= f.label :first_name %>: # <%= f.text_field :first_name %>
# # <%= f.label :last_name %>: # <%= f.text_field :last_name %>
# # <%= f.submit %> # <% end %> # # The HTML generated for this would be (modulus formatting): # #
#
# #
# : #
# # : #
# # #
# # 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 params[:person] with the person attributes # set in the form. That hash is ready to be passed to Person.create: # # 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 @person is an existing record with name "John Smith" and ID 256, # the code above as is would yield instead: # #
#
# # #
# : #
# # : #
# # #
# # Note that the endpoint, default values, and submit button label are tailored for @person. # 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 params[:person], ready to be # passed to Person#update_attributes: # # 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 %>
# <%= f.label :author, 'Author' %>: # <%= f.text_field :author %>
# <%= 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 %>
# Last name : <%= f.text_field :last_name %>
# Biography : <%= f.text_area :biography %>
# Admin? : <%= f.check_box :admin %>
# <%= 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: # # * :url - 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. # * :html - 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 @post 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 post given that the routes are set correctly: # # <%= form_for([@document, @comment]) do |f| %> # ... # <% end %> # # Where @document = Document.find(params[:id]) and # @comment = Comment.new. # # === 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 # behaviour. The expected default behaviour is an XMLHttpRequest in the background instead of the regular # POST arrangement, but ultimately the behaviour 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 params). # # Example: # # <%= form_for(@post, :remote => true) do |f| %> # ... # <% end %> # # The HTML generated for this would be: # #
#
# #
# ... #
# # === 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 people/_labelling_form and the local # variable referencing the form builder is called # labelling_form. # # 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 :authenticity_token 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 false: # # <%= 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) 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('') 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 :address is called # address_attributes=. # # 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 # address reader method and responds to the # address_attributes= 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 :allow_destroy 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 _destroy 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 projects reader method and responds to the # projects_attributes= writer method: # # class Person # def projects # [@project1, @project2] # end # # def projects_attributes=(attributes) # # Process the attributes hash # end # end # # Note that the projects_attributes= writer method is in fact # required for fields_for to correctly identify :projects 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 :allow_destroy # 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 _destroy # 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..) 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 :value 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) # # => # # 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) # # => # # 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(:post, :title, "A short title") # # => # # label(:post, :title, "A short title", :class => "title_label") # # => # # label(:post, :privacy, "Public Post", :value => "public") # # => # # label(:post, :terms) do # 'Accept Terms.' # 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) # # => # # text_field(:post, :title, :class => "create_input") # # => # # text_field(:session, :user, :onchange => "if $('session[user]').value == 'admin' { alert('Your login can not be admin!'); }") # # => # # text_field(:snippet, :code, :size => 20, :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) # # => # # password_field(:account, :secret, :class => "form_input", :value => @account.secret) # # => # # password_field(:user, :password, :onchange => "if $('user[password]').length > 30 { alert('Your password needs to be shorter!'); }") # # => # # password_field(: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) # # => # # hidden_field(:post, :tag_list) # # => # # hidden_field(: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 multipart/form-data. # # ==== Examples # file_field(:user, :avatar) # # => # # file_field(:post, :attached, :accept => 'text/html') # # => # # file_field(: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) # # => # # text_area(:comment, :text, :size => "20x30") # # => # # text_area(:application, :notes, :cols => 40, :rows => 15, :class => 'app_input') # # => # # text_area(:entry, :body, :size => "20x20", :disabled => 'disabled') # # => 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") # # => # # # # # Let's say that @puppy.gooddog is "no": # check_box("puppy", "gooddog", {}, "yes", "no") # # => # # # # check_box("eula", "accepted", { :class => 'eula_check' }, "yes", "no") # # => # # # 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 :checked => true 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") # # => # # # # radio_button("user", "receive_newsletter", "yes") # radio_button("user", "receive_newsletter", "no") # # => # # 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 a text_field of 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". 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". 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". 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 = "" 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.model_name @model_name ||= Struct.new(:partial_path).new(name.demodulize.underscore.sub!(/_builder$/, '')) 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