require 'cgi' require 'action_view/helpers/date_helper' require 'action_view/helpers/tag_helper' require 'action_view/helpers/form_tag_helper' module ActionView module Helpers # Form helpers are designed to make working with models much easier # compared to using just standard HTML elements by providing a set of # methods for creating forms based on your models. This helper generates # the HTML for forms, providing a method for each sort of input # (e.g., text, password, select, and so on). When the form is submitted # (i.e., when the user hits the submit button or form.submit is # called via JavaScript), the form inputs will be bundled into the # params object and passed back to the controller. # # There are two types of form helpers: those that specifically work with # model attributes and those that don't. This helper deals with those that # work with model attributes; to see an example of form helpers that don't # work with model attributes, check the ActionView::Helpers::FormTagHelper # documentation. # # The core method of this helper, form_for, gives you the ability to create # a form for a model instance; for example, let's say that you have a model # Person and want to create a new instance of it: # # # Note: a @person variable will have been created in the controller. # # For example: @person = Person.new # <% form_for :person, @person, :url => { :action => "create" } do |f| %> # <%= f.text_field :first_name %> # <%= f.text_field :last_name %> # <%= submit_tag 'Create' %> # <% end %> # # The HTML generated for this would be: # #
# # # #
# # If you are using a partial for your form fields, you can use this shortcut: # # <% form_for :person, @person, :url => { :action => "create" } do |f| %> # <%= render :partial => f %> # <%= submit_tag 'Create' %> # <% end %> # # This example will render the people/_form partial, setting a # local variable called form which references the yielded # FormBuilder. The params object created when this form is # submitted would look like: # # {"action"=>"create", "controller"=>"persons", "person"=>{"first_name"=>"William", "last_name"=>"Smith"}} # # The params hash has a nested person value, which can therefore # be accessed with params[:person] in the controller. If were # editing/updating an instance (e.g., Person.find(1) rather than # Person.new in the controller), the objects attribute values are # filled into the form (e.g., the person_first_name field would # have that person's first name in it). # # If the object name contains square brackets the id for the object will be # inserted. For example: # # <%= text_field "person[]", "name" %> # # ...will generate the following ERb. # # # # If the helper is being used to generate a repetitive sequence of similar # form elements, for example in a partial used by # render_collection_of_partials, the index option may # come in handy. Example: # # <%= text_field "person", "name", "index" => 1 %> # # ...becomes... # # # # An index option may also be passed to form_for and # fields_for. This automatically applies the index to # all the nested fields. # # There are also methods for helping to build form tags in # link:classes/ActionView/Helpers/FormOptionsHelper.html, # link:classes/ActionView/Helpers/DateHelper.html, and # link:classes/ActionView/Helpers/ActiveRecordHelper.html module FormHelper # 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 %>
# <% 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, :url => { :action => "update" } do |f| %> # <%= f.error_messages %> # First name: <%= f.text_field :first_name %>
# Last name : <%= f.text_field :last_name %>
# Biography : <%= f.text_area :biography %>
# Admin? : <%= f.check_box :admin %>
# <% end %> # # There, the first argument is a symbol or string with the name of the # object the form is about, and also the name of the instance variable # the object is stored in. # # 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 %> # # If the instance variable is not @person you can pass the actual # record as the second argument: # # <% form_for :person, person, :url => { :action => "update" } do |f| %> # ... # <% end %> # # In that case you can think # # <%= f.text_field :first_name %> # # gets expanded to # # <%= text_field :person, :first_name, :object => person %> # # You can even display error messages of the wrapped model this way: # # <%= f.error_messages %> # # In any of its variants, 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. # # Worth noting is that the +form_for+ tag is called in a ERb evaluation # block, not an ERb output block. So that's <% %>, not # <%= %>. # # 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, @person, :url => { :action => "update" } 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? %> # <% 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, @post, :url => post_path(@post), :html => { :method => :put, :class => "edit_post", :id => "edit_post_45" } do |f| %> # ... # <% end %> # # And for new records # # <% form_for(Post.new) do |f| %> # ... # <% end %> # # expands to # # <% form_for :post, Post.new, :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_post_path(@post)) do |f| %> # ... # <% end %> # # And for namespaced routes, like +admin_post_url+: # # <% form_for([:admin, @post]) do |f| %> # ... # <% 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, @person, :url => { :action => "update" }, :builder => LabellingFormBuilder do |f| %> # <%= f.text_field :first_name %> # <%= f.text_field :last_name %> # <%= text_area :person, :biography %> # <%= check_box_tag "person[admin]", @person.company.admin? %> # <% end %> # # In this case, if you use this: # # <%= render :partial => 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 explicitely 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. def form_for(record_or_name_or_array, *args, &proc) raise ArgumentError, "Missing block" unless block_given? options = args.extract_options! case record_or_name_or_array when String, Symbol object_name = record_or_name_or_array when Array object = record_or_name_or_array.last object_name = ActionController::RecordIdentifier.singular_class_name(object) apply_form_for_options!(record_or_name_or_array, options) args.unshift object else object = record_or_name_or_array object_name = ActionController::RecordIdentifier.singular_class_name(object) apply_form_for_options!([object], options) args.unshift object end concat(form_tag(options.delete(:url) || {}, options.delete(:html) || {})) fields_for(object_name, *(args << options), &proc) concat(''.html_safe) 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 html_options = if object.respond_to?(:new_record?) && object.new_record? { :class => dom_class(object, :new), :id => dom_id(object), :method => :post } else { :class => dom_class(object, :edit), :id => dom_id(object, :edit), :method => :put } end options[:html] ||= {} options[:html].reverse_merge!(html_options) options[:url] ||= polymorphic_path(object_or_array) end # 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, :url => { :action => "update" } 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 %> # <% 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, :url => { :action => "update" } 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, :url => { :action => "update" } 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 # # 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, :url => { :action => "update" } 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, :url => { :action => "update" } 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, :url => { :action => "update" } 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, :url => { :action => "update" } do |person_form| %> # ... # <% person_form.fields_for :projects do |project_fields| %> # Delete: <%= project_fields.check_box :_destroy %> # <% end %> # <% end %> def fields_for(record_or_name_or_array, *args, &block) raise ArgumentError, "Missing block" unless block_given? options = args.extract_options! case record_or_name_or_array when String, Symbol object_name = record_or_name_or_array object = args.first else object = record_or_name_or_array object_name = ActionController::RecordIdentifier.singular_class_name(object) end builder = options[:builder] || ActionView::Base.default_form_builder yield builder.new(object_name, object, self, options, block) 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 views.labels..) 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) # # views: # labels: # 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 like this: # # activerecord: # attribute: # 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") # # => # def label(object_name, method, text = nil, options = {}) InstanceTag.new(object_name, method, self, options.delete(:object)).to_label_tag(text, options) 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") # # => # # 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", 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 an 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. # # ==== 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) 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 a hidden field with the same name as # the checkbox after the very check box. So, 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 Rails parameters extraction always # gets the first occurrence of any given key, that works in 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. # # ==== 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 end class InstanceTag #:nodoc: include Helpers::TagHelper, Helpers::FormTagHelper attr_reader :method_name, :object_name DEFAULT_FIELD_OPTIONS = { "size" => 30 }.freeze unless const_defined?(:DEFAULT_FIELD_OPTIONS) DEFAULT_RADIO_OPTIONS = { }.freeze unless const_defined?(:DEFAULT_RADIO_OPTIONS) DEFAULT_TEXT_AREA_OPTIONS = { "cols" => 40, "rows" => 20 }.freeze unless const_defined?(:DEFAULT_TEXT_AREA_OPTIONS) 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 = object if @object_name.sub!(/\[\]$/,"") || @object_name.sub!(/\[\]\]$/,"]") if (object ||= @template_object.instance_variable_get("@#{Regexp.last_match.pre_match}")) && 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 end def to_label_tag(text = nil, options = {}) options = options.stringify_keys tag_value = options.delete("value") name_and_id = options.dup name_and_id["id"] = name_and_id["for"] add_default_name_and_id_for_value(tag_value, name_and_id) options.delete("index") options["for"] ||= name_and_id["id"] content = if text.blank? i18n_label = I18n.t("helpers.label.#{object_name}.#{method_name}", :default => "") i18n_label if i18n_label.present? 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 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"] ||= value_before_type_cast(object) unless field_type == "file" options["value"] &&= html_escape(options["value"]) add_default_name_and_id(options) tag("input", 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", 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 add_default_name_and_id(options) 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 object @object || @template_object.instance_variable_get("@#{@object_name}") rescue NameError # As @object_name may contain the nested syntax (item[subobject]) we # need to fallback to nil. nil 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 unless object.nil? 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}" unless specified_id 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"] ||= tag_id_with_index(options["index"]) options.delete("index") elsif defined?(@auto_index) options["name"] ||= tag_name_with_index(@auto_index) options["id"] ||= tag_id_with_index(@auto_index) else options["name"] ||= tag_name + (options.has_key?('multiple') ? '[]' : '') options["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 #:nodoc: # The methods which wrap a form helper call. class_inheritable_accessor :field_helpers self.field_helpers = (FormHelper.instance_methods - ['form_for']) attr_accessor :object_name, :object, :options def initialize(object_name, object, template, options, proc) @nested_child_index = {} @object_name, @object, @template, @options, @proc = object_name, object, template, options, proc @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 end (field_helpers - %w(label check_box radio_button fields_for hidden_field)).each do |selector| src, line = <<-end_src, __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 end_src class_eval src, __FILE__, line end def fields_for(record_or_name_or_array, *args, &block) if options.has_key?(:index) index = "[#{options[:index]}]" elsif defined?(@auto_index) self.object_name = @object_name.to_s.sub(/\[\]$/,"") index = "[#{@auto_index}]" else index = "" end if options[:builder] args << {} unless args.last.is_a?(Hash) args.last[:builder] ||= options[:builder] end case record_or_name_or_array when String, Symbol if nested_attributes_association?(record_or_name_or_array) return fields_for_with_nested_attributes(record_or_name_or_array, args, block) else name = "#{object_name}#{index}[#{record_or_name_or_array}]" end when Array object = record_or_name_or_array.last name = "#{object_name}#{index}[#{ActionController::RecordIdentifier.singular_class_name(object)}]" args.unshift(object) else object = record_or_name_or_array name = "#{object_name}#{index}[#{ActionController::RecordIdentifier.singular_class_name(object)}]" args.unshift(object) end @template.fields_for(name, *args, &block) end def label(method, text = nil, options = {}) @template.label(@object_name, method, text, objectify_options(options)) 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 error_message_on(method, *args) @template.error_message_on(@object || @object_name, method, *args) end def error_messages(options = {}) @template.error_messages_for(@object_name, objectify_options(options)) end def submit(value = "Save changes", options = {}) @template.submit_tag(value, options.reverse_merge(:id => "#{object_name}_submit")) end def emitted_hidden_id? @emitted_hidden_id end private def objectify_options(options) @default_options.merge(options.merge(:object => @object)) end def nested_attributes_association?(association_name) @object.respond_to?("#{association_name}_attributes=") end def fields_for_with_nested_attributes(association_name, args, block) name = "#{object_name}[#{association_name}_attributes]" association = args.first if association.respond_to?(:new_record?) association = [association] if @object.send(association_name).is_a?(Array) elsif !association.is_a?(Array) association = @object.send(association_name) end if association.is_a?(Array) explicit_child_index = args.last[:child_index] if args.last.is_a?(Hash) association.map do |child| fields_for_nested_model("#{name}[#{explicit_child_index || nested_child_index(name)}]", child, args, block) end.join elsif association fields_for_nested_model(name, association, args, block) end end def fields_for_nested_model(name, object, args, block) if object.new_record? @template.fields_for(name, object, *args, &block) else @template.fields_for(name, object, *args) do |builder| block.call(builder) @template.concat builder.hidden_field(:id) unless builder.emitted_hidden_id? end end end def nested_child_index(name) @nested_child_index[name] ||= -1 @nested_child_index[name] += 1 end end end class Base cattr_accessor :default_form_builder self.default_form_builder = ::ActionView::Helpers::FormBuilder end end