require 'cgi'
require File.dirname(__FILE__) + '/form_helper'
module ActionView
class Base
@@field_error_proc = Proc.new{ |html_tag, instance| "
#{html_tag}
" }
cattr_accessor :field_error_proc
end
module Helpers
# The Active Record Helper makes it easier to create forms for records kept in instance variables. The most far-reaching is the form
# method that creates a complete form for all the basic content types of the record (not associations or aggregations, though). This
# is a great of making the record quickly available for editing, but likely to prove lackluster for a complicated real-world form.
# In that case, it's better to use the input method and the specialized form methods in link:classes/ActionView/Helpers/FormHelper.html
module ActiveRecordHelper
# Returns a default input tag for the type of object returned by the method. Example
# (title is a VARCHAR column and holds "Hello World"):
# input("post", "title") =>
#
def input(record_name, method, options = {})
InstanceTag.new(record_name, method, self).to_tag(options)
end
# Returns an entire form with input tags and everything for a specified Active Record object. Example
# (post is a new record that has a title using VARCHAR and a body using TEXT):
# form("post") =>
#
#
# It's possible to specialize the form builder by using a different action name and by supplying another
# block renderer. Example (entry is a new record that has a message attribute using VARCHAR):
#
# form("entry", :action => "sign", :input_block =>
# Proc.new { |record, column| "#{column.human_name}: #{input(record, column.name)} " }) =>
#
#
#
# It's also possible to add additional content to the form by giving it a block, such as:
#
# form("entry", :action => "sign") do |form|
# form << content_tag("b", "Department")
# form << collection_select("department", "id", @departments, "id", "name")
# end
def form(record_name, options = {})
record = instance_variable_get("@#{record_name}")
options = options.symbolize_keys
options[:action] ||= record.new_record? ? "create" : "update"
action = url_for(:action => options[:action], :id => record)
submit_value = options[:submit_value] || options[:action].gsub(/[^\w]/, '').capitalize
contents = ''
contents << hidden_field(record_name, :id) unless record.new_record?
contents << all_input_tags(record, record_name, options)
yield contents if block_given?
contents << submit_tag(submit_value)
content_tag('form', contents, :action => action, :method => 'post', :enctype => options[:multipart] ? 'multipart/form-data': nil)
end
# Returns a string containing the error message attached to the +method+ on the +object+, if one exists.
# This error message is wrapped in a DIV tag, which can be specialized to include both a +prepend_text+ and +append_text+
# to properly introduce the error and a +css_class+ to style it accordingly. Examples (post has an error message
# "can't be empty" on the title attribute):
#
# <%= error_message_on "post", "title" %> =>
#
def error_message_on(object, method, prepend_text = "", append_text = "", css_class = "formError")
if errors = instance_variable_get("@#{object}").errors.on(method)
content_tag("div", "#{prepend_text}#{errors.is_a?(Array) ? errors.first : errors}#{append_text}", :class => css_class)
end
end
# Returns a string with a div containing all of the error messages for the objects located as instance variables by the names
# given. If more than one object is specified, the errors for the objects are displayed in the order that the object names are
# provided.
#
# This div can be tailored by the following options:
#
# * header_tag - Used for the header of the error div (default: h2)
# * id - The id of the error div (default: errorExplanation)
# * class - The class of the error div (default: errorExplanation)
# * object_name - The object name to use in the header, or
# any text that you prefer. If object_name is not set, the name of
# the first object will be used.
#
# Specifying one object:
#
# error_messages_for 'user'
#
# Specifying more than one object (and using the name 'user' in the
# header as the object_name instead of 'user_common'):
#
# error_messages_for 'user_common', 'user', :object_name => 'user'
#
# NOTE: This is a pre-packaged presentation of the errors with embedded strings and a certain HTML structure. If what
# you need is significantly different from the default presentation, it makes plenty of sense to access the object.errors
# instance yourself and set it up. View the source of this method to see how easy it is.
def error_messages_for(*params)
options = params.last.is_a?(Hash) ? params.pop.symbolize_keys : {}
objects = params.collect {|object_name| instance_variable_get("@#{object_name}") }.compact
count = objects.inject(0) {|sum, object| sum + object.errors.count }
unless count.zero?
html = {}
[:id, :class].each do |key|
if options.include?(key)
value = options[key]
html[key] = value unless value.blank?
else
html[key] = 'errorExplanation'
end
end
header_message = "#{pluralize(count, 'error')} prohibited this #{(options[:object_name] || params.first).to_s.gsub('_', ' ')} from being saved"
error_messages = objects.map {|object| object.errors.full_messages.map {|msg| content_tag(:li, msg) } }
content_tag(:div,
content_tag(options[:header_tag] || :h2, header_message) <<
content_tag(:p, 'There were problems with the following fields:') <<
content_tag(:ul, error_messages),
html
)
else
''
end
end
private
def all_input_tags(record, record_name, options)
input_block = options[:input_block] || default_input_block
record.class.content_columns.collect{ |column| input_block.call(record_name, column) }.join("\n")
end
def default_input_block
Proc.new { |record, column| %(
#{input(record, column.name)}
) }
end
end
class InstanceTag #:nodoc:
def to_tag(options = {})
case column_type
when :string
field_type = @method_name.include?("password") ? "password" : "text"
to_input_field_tag(field_type, options)
when :text
to_text_area_tag(options)
when :integer, :float
to_input_field_tag("text", options)
when :date
to_date_select_tag(options)
when :datetime, :timestamp
to_datetime_select_tag(options)
when :boolean
to_boolean_select_tag(options)
end
end
alias_method :tag_without_error_wrapping, :tag
def tag(name, options)
if object.respond_to?("errors") && object.errors.respond_to?("on")
error_wrapping(tag_without_error_wrapping(name, options), object.errors.on(@method_name))
else
tag_without_error_wrapping(name, options)
end
end
alias_method :content_tag_without_error_wrapping, :content_tag
def content_tag(name, value, options)
if object.respond_to?("errors") && object.errors.respond_to?("on")
error_wrapping(content_tag_without_error_wrapping(name, value, options), object.errors.on(@method_name))
else
content_tag_without_error_wrapping(name, value, options)
end
end
alias_method :to_date_select_tag_without_error_wrapping, :to_date_select_tag
def to_date_select_tag(options = {})
if object.respond_to?("errors") && object.errors.respond_to?("on")
error_wrapping(to_date_select_tag_without_error_wrapping(options), object.errors.on(@method_name))
else
to_date_select_tag_without_error_wrapping(options)
end
end
alias_method :to_datetime_select_tag_without_error_wrapping, :to_datetime_select_tag
def to_datetime_select_tag(options = {})
if object.respond_to?("errors") && object.errors.respond_to?("on")
error_wrapping(to_datetime_select_tag_without_error_wrapping(options), object.errors.on(@method_name))
else
to_datetime_select_tag_without_error_wrapping(options)
end
end
def error_wrapping(html_tag, has_error)
has_error ? Base.field_error_proc.call(html_tag, self) : html_tag
end
def error_message
object.errors.on(@method_name)
end
def column_type
object.send("column_for_attribute", @method_name).type
end
end
end
end