Move actionpack/lib/action_view* into actionview/lib

1 files changed, 832 insertions, 0 deletions

diff --git a/actionview/lib/action_view/helpers/form_options_helper.rb b/actionview/lib/action_view/helpers/form_options_helper.rb
new file mode 100644
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+++ b/actionview/lib/action_view/helpers/form_options_helper.rb
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+require 'cgi'
+require 'erb'
+require 'action_view/helpers/form_helper'
+require 'active_support/core_ext/string/output_safety'
+require 'active_support/core_ext/array/extract_options'
+require 'active_support/core_ext/array/wrap'
+
+module ActionView
+  # = Action View Form Option Helpers
+  module Helpers
+    # Provides a number of methods for turning different kinds of containers into a set of option tags.
+    #
+    # The <tt>collection_select</tt>, <tt>select</tt> and <tt>time_zone_select</tt> methods take an <tt>options</tt> parameter, a hash:
+    #
+    # * <tt>:include_blank</tt> - set to true or a prompt string if the first option element of the select element is a blank. Useful if there is not a default value required for the select element.
+    #
+    #   select("post", "category", Post::CATEGORIES, {include_blank: true})
+    #
+    # could become:
+    #
+    #   <select name="post[category]">
+    #     <option></option>
+    #     <option>joke</option>
+    #     <option>poem</option>
+    #   </select>
+    #
+    # Another common case is a select tag for a <tt>belongs_to</tt>-associated object.
+    #
+    # Example with @post.person_id => 2:
+    #
+    #   select("post", "person_id", Person.all.collect {|p| [ p.name, p.id ] }, {include_blank: 'None'})
+    #
+    # could become:
+    #
+    #   <select name="post[person_id]">
+    #     <option value="">None</option>
+    #     <option value="1">David</option>
+    #     <option value="2" selected="selected">Sam</option>
+    #     <option value="3">Tobias</option>
+    #   </select>
+    #
+    # * <tt>:prompt</tt> - set to true or a prompt string. When the select element doesn't have a value yet, this prepends an option with a generic prompt -- "Please select" -- or the given prompt string.
+    #
+    #   select("post", "person_id", Person.all.collect {|p| [ p.name, p.id ] }, {prompt: 'Select Person'})
+    #
+    # could become:
+    #
+    #   <select name="post[person_id]">
+    #     <option value="">Select Person</option>
+    #     <option value="1">David</option>
+    #     <option value="2">Sam</option>
+    #     <option value="3">Tobias</option>
+    #   </select>
+    #
+    # Like the other form helpers, +select+ can accept an <tt>:index</tt> option to manually set the ID used in the resulting output. Unlike other helpers, +select+ expects this
+    # option to be in the +html_options+ parameter.
+    #
+    #   select("album[]", "genre", %w[rap rock country], {}, { index: nil })
+    #
+    # becomes:
+    #
+    #   <select name="album[][genre]" id="album__genre">
+    #     <option value="rap">rap</option>
+    #     <option value="rock">rock</option>
+    #     <option value="country">country</option>
+    #   </select>
+    #
+    # * <tt>:disabled</tt> - can be a single value or an array of values that will be disabled options in the final output.
+    #
+    #   select("post", "category", Post::CATEGORIES, {disabled: 'restricted'})
+    #
+    # could become:
+    #
+    #   <select name="post[category]">
+    #     <option></option>
+    #     <option>joke</option>
+    #     <option>poem</option>
+    #     <option disabled="disabled">restricted</option>
+    #   </select>
+    #
+    # When used with the <tt>collection_select</tt> helper, <tt>:disabled</tt> can also be a Proc that identifies those options that should be disabled.
+    #
+    #   collection_select(:post, :category_id, Category.all, :id, :name, {disabled: lambda{|category| category.archived? }})
+    #
+    # If the categories "2008 stuff" and "Christmas" return true when the method <tt>archived?</tt> is called, this would return:
+    #   <select name="post[category_id]">
+    #     <option value="1" disabled="disabled">2008 stuff</option>
+    #     <option value="2" disabled="disabled">Christmas</option>
+    #     <option value="3">Jokes</option>
+    #     <option value="4">Poems</option>
+    #   </select>
+    #
+    module FormOptionsHelper
+      # ERB::Util can mask some helpers like textilize. Make sure to include them.
+      include TextHelper
+
+      # Create a select tag and a series of contained option tags for the provided object and method.
+      # The option currently held by the object will be selected, provided that the object is available.
+      #
+      # There are two possible formats for the choices parameter, corresponding to other helpers' output:
+      #   * A flat collection: see options_for_select
+      #   * A nested collection: see grouped_options_for_select
+      #
+      # Example with @post.person_id => 1:
+      #   select("post", "person_id", Person.all.collect {|p| [ p.name, p.id ] }, { include_blank: true })
+      #
+      # could become:
+      #
+      #   <select name="post[person_id]">
+      #     <option value=""></option>
+      #     <option value="1" selected="selected">David</option>
+      #     <option value="2">Sam</option>
+      #     <option value="3">Tobias</option>
+      #   </select>
+      #
+      # This can be used to provide a default set of options in the standard way: before rendering the create form, a
+      # new model instance is assigned the default options and bound to @model_name. Usually this model is not saved
+      # to the database. Instead, a second model object is created when the create request is received.
+      # This allows the user to submit a form page more than once with the expected results of creating multiple records.
+      # In addition, this allows a single partial to be used to generate form inputs for both edit and create forms.
+      #
+      # By default, <tt>post.person_id</tt> is the selected option. Specify <tt>selected: value</tt> to use a different selection
+      # or <tt>selected: nil</tt> to leave all options unselected. Similarly, you can specify values to be disabled in the option
+      # tags by specifying the <tt>:disabled</tt> option. This can either be a single value or an array of values to be disabled.
+      #
+      # ==== Gotcha
+      #
+      # The HTML specification says when +multiple+ parameter passed to select and all options got deselected
+      # web browsers do not send any value to server. Unfortunately this introduces a gotcha:
+      # if an +User+ model has many +roles+ and have +role_ids+ accessor, and in the form that edits roles of the user
+      # the user deselects all roles from +role_ids+ multiple select box, no +role_ids+ parameter is sent. So,
+      # any mass-assignment idiom like
+      #
+      #   @user.update(params[:user])
+      #
+      # wouldn't update roles.
+      #
+      # To prevent this the helper generates an auxiliary hidden field before
+      # every multiple select. The hidden field has the same name as multiple select and blank value.
+      #
+      # This way, the client either sends only the hidden field (representing
+      # the deselected multiple select box), 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.
+      #
+      # In case if you don't want the helper to generate this hidden field you can specify
+      # <tt>include_hidden: false</tt> option.
+      #
+      def select(object, method, choices, options = {}, html_options = {})
+        Tags::Select.new(object, method, self, choices, options, html_options).render
+      end
+
+      # Returns <tt><select></tt> and <tt><option></tt> tags for the collection of existing return values of
+      # +method+ for +object+'s class. The value returned from calling +method+ on the instance +object+ will
+      # be selected. If calling +method+ returns +nil+, no selection is made without including <tt>:prompt</tt>
+      # or <tt>:include_blank</tt> in the +options+ hash.
+      #
+      # The <tt>:value_method</tt> and <tt>:text_method</tt> parameters are methods to be called on each member
+      # of +collection+. The return values are used as the +value+ attribute and contents of each
+      # <tt><option></tt> tag, respectively. They can also be any object that responds to +call+, such
+      # as a +proc+, that will be called for each member of the +collection+ to
+      # retrieve the value/text.
+      #
+      # Example object structure for use with this method:
+      #
+      #   class Post < ActiveRecord::Base
+      #     belongs_to :author
+      #   end
+      #
+      #   class Author < ActiveRecord::Base
+      #     has_many :posts
+      #     def name_with_initial
+      #       "#{first_name.first}. #{last_name}"
+      #     end
+      #   end
+      #
+      # Sample usage (selecting the associated Author for an instance of Post, <tt>@post</tt>):
+      #
+      #   collection_select(:post, :author_id, Author.all, :id, :name_with_initial, prompt: true)
+      #
+      # If <tt>@post.author_id</tt> is already <tt>1</tt>, this would return:
+      #   <select name="post[author_id]">
+      #     <option value="">Please select</option>
+      #     <option value="1" selected="selected">D. Heinemeier Hansson</option>
+      #     <option value="2">D. Thomas</option>
+      #     <option value="3">M. Clark</option>
+      #   </select>
+      def collection_select(object, method, collection, value_method, text_method, options = {}, html_options = {})
+        Tags::CollectionSelect.new(object, method, self, collection, value_method, text_method, options, html_options).render
+      end
+
+      # Returns <tt><select></tt>, <tt><optgroup></tt> and <tt><option></tt> tags for the collection of existing return values of
+      # +method+ for +object+'s class. The value returned from calling +method+ on the instance +object+ will
+      # be selected. If calling +method+ returns +nil+, no selection is made without including <tt>:prompt</tt>
+      # or <tt>:include_blank</tt> in the +options+ hash.
+      #
+      # Parameters:
+      # * +object+ - The instance of the class to be used for the select tag
+      # * +method+ - The attribute of +object+ corresponding to the select tag
+      # * +collection+ - An array of objects representing the <tt><optgroup></tt> tags.
+      # * +group_method+ - The name of a method which, when called on a member of +collection+, returns an
+      #   array of child objects representing the <tt><option></tt> tags.
+      # * +group_label_method+ - The name of a method which, when called on a member of +collection+, returns a
+      #   string to be used as the +label+ attribute for its <tt><optgroup></tt> tag.
+      # * +option_key_method+ - The name of a method which, when called on a child object of a member of
+      #   +collection+, returns a value to be used as the +value+ attribute for its <tt><option></tt> tag.
+      # * +option_value_method+ - The name of a method which, when called on a child object of a member of
+      #   +collection+, returns a value to be used as the contents of its <tt><option></tt> tag.
+      #
+      # Example object structure for use with this method:
+      #
+      #   class Continent < ActiveRecord::Base
+      #     has_many :countries
+      #     # attribs: id, name
+      #   end
+      #
+      #   class Country < ActiveRecord::Base
+      #     belongs_to :continent
+      #     # attribs: id, name, continent_id
+      #   end
+      #
+      #   class City < ActiveRecord::Base
+      #     belongs_to :country
+      #     # attribs: id, name, country_id
+      #   end
+      #
+      # Sample usage:
+      #
+      #   grouped_collection_select(:city, :country_id, @continents, :countries, :name, :id, :name)
+      #
+      # Possible output:
+      #
+      #   <select name="city[country_id]">
+      #     <optgroup label="Africa">
+      #       <option value="1">South Africa</option>
+      #       <option value="3">Somalia</option>
+      #     </optgroup>
+      #     <optgroup label="Europe">
+      #       <option value="7" selected="selected">Denmark</option>
+      #       <option value="2">Ireland</option>
+      #     </optgroup>
+      #   </select>
+      #
+      def grouped_collection_select(object, method, collection, group_method, group_label_method, option_key_method, option_value_method, options = {}, html_options = {})
+        Tags::GroupedCollectionSelect.new(object, method, self, collection, group_method, group_label_method, option_key_method, option_value_method, options, html_options).render
+      end
+
+      # Return select and option tags for the given object and method, using
+      # #time_zone_options_for_select to generate the list of option tags.
+      #
+      # In addition to the <tt>:include_blank</tt> option documented above,
+      # this method also supports a <tt>:model</tt> option, which defaults
+      # to ActiveSupport::TimeZone. This may be used by users to specify a
+      # different time zone model object. (See +time_zone_options_for_select+
+      # for more information.)
+      #
+      # You can also supply an array of ActiveSupport::TimeZone objects
+      # as +priority_zones+, so that they will be listed above the rest of the
+      # (long) list. (You can use ActiveSupport::TimeZone.us_zones as a convenience
+      # for obtaining a list of the US time zones, or a Regexp to select the zones
+      # of your choice)
+      #
+      # Finally, this method supports a <tt>:default</tt> option, which selects
+      # a default ActiveSupport::TimeZone if the object's time zone is +nil+.
+      #
+      #   time_zone_select( "user", "time_zone", nil, include_blank: true)
+      #
+      #   time_zone_select( "user", "time_zone", nil, default: "Pacific Time (US & Canada)" )
+      #
+      #   time_zone_select( "user", 'time_zone', ActiveSupport::TimeZone.us_zones, default: "Pacific Time (US & Canada)")
+      #
+      #   time_zone_select( "user", 'time_zone', [ ActiveSupport::TimeZone['Alaska'], ActiveSupport::TimeZone['Hawaii'] ])
+      #
+      #   time_zone_select( "user", 'time_zone', /Australia/)
+      #
+      #   time_zone_select( "user", "time_zone", ActiveSupport::TimeZone.all.sort, model: ActiveSupport::TimeZone)
+      def time_zone_select(object, method, priority_zones = nil, options = {}, html_options = {})
+        Tags::TimeZoneSelect.new(object, method, self, priority_zones, options, html_options).render
+      end
+
+      # Accepts a container (hash, array, enumerable, your type) and returns a string of option tags. Given a container
+      # where the elements respond to first and last (such as a two-element array), the "lasts" serve as option values and
+      # the "firsts" as option text. Hashes are turned into this form automatically, so the keys become "firsts" and values
+      # become lasts. If +selected+ is specified, the matching "last" or element will get the selected option-tag. +selected+
+      # may also be an array of values to be selected when using a multiple select.
+      #
+      #   options_for_select([["Dollar", "$"], ["Kroner", "DKK"]])
+      #   # => <option value="$">Dollar</option>
+      #   # => <option value="DKK">Kroner</option>
+      #
+      #   options_for_select([ "VISA", "MasterCard" ], "MasterCard")
+      #   # => <option>VISA</option>
+      #   # => <option selected="selected">MasterCard</option>
+      #
+      #   options_for_select({ "Basic" => "$20", "Plus" => "$40" }, "$40")
+      #   # => <option value="$20">Basic</option>
+      #   # => <option value="$40" selected="selected">Plus</option>
+      #
+      #   options_for_select([ "VISA", "MasterCard", "Discover" ], ["VISA", "Discover"])
+      #   # => <option selected="selected">VISA</option>
+      #   # => <option>MasterCard</option>
+      #   # => <option selected="selected">Discover</option>
+      #
+      # You can optionally provide html attributes as the last element of the array.
+      #
+      #   options_for_select([ "Denmark", ["USA", {class: 'bold'}], "Sweden" ], ["USA", "Sweden"])
+      #   # => <option value="Denmark">Denmark</option>
+      #   # => <option value="USA" class="bold" selected="selected">USA</option>
+      #   # => <option value="Sweden" selected="selected">Sweden</option>
+      #
+      #   options_for_select([["Dollar", "$", {class: "bold"}], ["Kroner", "DKK", {onclick: "alert('HI');"}]])
+      #   # => <option value="$" class="bold">Dollar</option>
+      #   # => <option value="DKK" onclick="alert('HI');">Kroner</option>
+      #
+      # If you wish to specify disabled option tags, set +selected+ to be a hash, with <tt>:disabled</tt> being either a value
+      # or array of values to be disabled. In this case, you can use <tt>:selected</tt> to specify selected option tags.
+      #
+      #   options_for_select(["Free", "Basic", "Advanced", "Super Platinum"], disabled: "Super Platinum")
+      #   # => <option value="Free">Free</option>
+      #   # => <option value="Basic">Basic</option>
+      #   # => <option value="Advanced">Advanced</option>
+      #   # => <option value="Super Platinum" disabled="disabled">Super Platinum</option>
+      #
+      #   options_for_select(["Free", "Basic", "Advanced", "Super Platinum"], disabled: ["Advanced", "Super Platinum"])
+      #   # => <option value="Free">Free</option>
+      #   # => <option value="Basic">Basic</option>
+      #   # => <option value="Advanced" disabled="disabled">Advanced</option>
+      #   # => <option value="Super Platinum" disabled="disabled">Super Platinum</option>
+      #
+      #   options_for_select(["Free", "Basic", "Advanced", "Super Platinum"], selected: "Free", disabled: "Super Platinum")
+      #   # => <option value="Free" selected="selected">Free</option>
+      #   # => <option value="Basic">Basic</option>
+      #   # => <option value="Advanced">Advanced</option>
+      #   # => <option value="Super Platinum" disabled="disabled">Super Platinum</option>
+      #
+      # NOTE: Only the option tags are returned, you have to wrap this call in a regular HTML select tag.
+      def options_for_select(container, selected = nil)
+        return container if String === container
+
+        selected, disabled = extract_selected_and_disabled(selected).map do |r|
+          Array(r).map { |item| item.to_s }
+        end
+
+        container.map do |element|
+          html_attributes = option_html_attributes(element)
+          text, value = option_text_and_value(element).map { |item| item.to_s }
+
+          html_attributes[:selected] = 'selected' if option_value_selected?(value, selected)
+          html_attributes[:disabled] = 'disabled' if disabled && option_value_selected?(value, disabled)
+          html_attributes[:value] = value
+
+          content_tag_string(:option, text, html_attributes)
+        end.join("\n").html_safe
+      end
+
+      # Returns a string of option tags that have been compiled by iterating over the +collection+ and assigning
+      # the result of a call to the +value_method+ as the option value and the +text_method+ as the option text.
+      #
+      #   options_from_collection_for_select(@people, 'id', 'name')
+      #   # => <option value="#{person.id}">#{person.name}</option>
+      #
+      # This is more often than not used inside a #select_tag like this example:
+      #
+      #   select_tag 'person', options_from_collection_for_select(@people, 'id', 'name')
+      #
+      # If +selected+ is specified as a value or array of values, the element(s) returning a match on +value_method+
+      # will be selected option tag(s).
+      #
+      # If +selected+ is specified as a Proc, those members of the collection that return true for the anonymous
+      # function are the selected values.
+      #
+      # +selected+ can also be a hash, specifying both <tt>:selected</tt> and/or <tt>:disabled</tt> values as required.
+      #
+      # Be sure to specify the same class as the +value_method+ when specifying selected or disabled options.
+      # Failure to do this will produce undesired results. Example:
+      #   options_from_collection_for_select(@people, 'id', 'name', '1')
+      # Will not select a person with the id of 1 because 1 (an Integer) is not the same as '1' (a string)
+      #   options_from_collection_for_select(@people, 'id', 'name', 1)
+      # should produce the desired results.
+      def options_from_collection_for_select(collection, value_method, text_method, selected = nil)
+        options = collection.map do |element|
+          [value_for_collection(element, text_method), value_for_collection(element, value_method), option_html_attributes(element)]
+        end
+        selected, disabled = extract_selected_and_disabled(selected)
+        select_deselect = {
+          :selected => extract_values_from_collection(collection, value_method, selected),
+          :disabled => extract_values_from_collection(collection, value_method, disabled)
+        }
+
+        options_for_select(options, select_deselect)
+      end
+
+      # Returns a string of <tt><option></tt> tags, like <tt>options_from_collection_for_select</tt>, but
+      # groups them by <tt><optgroup></tt> tags based on the object relationships of the arguments.
+      #
+      # Parameters:
+      # * +collection+ - An array of objects representing the <tt><optgroup></tt> tags.
+      # * +group_method+ - The name of a method which, when called on a member of +collection+, returns an
+      #   array of child objects representing the <tt><option></tt> tags.
+      # * group_label_method+ - The name of a method which, when called on a member of +collection+, returns a
+      #   string to be used as the +label+ attribute for its <tt><optgroup></tt> tag.
+      # * +option_key_method+ - The name of a method which, when called on a child object of a member of
+      #   +collection+, returns a value to be used as the +value+ attribute for its <tt><option></tt> tag.
+      # * +option_value_method+ - The name of a method which, when called on a child object of a member of
+      #   +collection+, returns a value to be used as the contents of its <tt><option></tt> tag.
+      # * +selected_key+ - A value equal to the +value+ attribute for one of the <tt><option></tt> tags,
+      #   which will have the +selected+ attribute set. Corresponds to the return value of one of the calls
+      #   to +option_key_method+. If +nil+, no selection is made. Can also be a hash if disabled values are
+      #   to be specified.
+      #
+      # Example object structure for use with this method:
+      #
+      #   class Continent < ActiveRecord::Base
+      #     has_many :countries
+      #     # attribs: id, name
+      #   end
+      #
+      #   class Country < ActiveRecord::Base
+      #     belongs_to :continent
+      #     # attribs: id, name, continent_id
+      #   end
+      #
+      # Sample usage:
+      #   option_groups_from_collection_for_select(@continents, :countries, :name, :id, :name, 3)
+      #
+      # Possible output:
+      #   <optgroup label="Africa">
+      #     <option value="1">Egypt</option>
+      #     <option value="4">Rwanda</option>
+      #     ...
+      #   </optgroup>
+      #   <optgroup label="Asia">
+      #     <option value="3" selected="selected">China</option>
+      #     <option value="12">India</option>
+      #     <option value="5">Japan</option>
+      #     ...
+      #   </optgroup>
+      #
+      # <b>Note:</b> Only the <tt><optgroup></tt> and <tt><option></tt> tags are returned, so you still have to
+      # wrap the output in an appropriate <tt><select></tt> tag.
+      def option_groups_from_collection_for_select(collection, group_method, group_label_method, option_key_method, option_value_method, selected_key = nil)
+        collection.map do |group|
+          option_tags = options_from_collection_for_select(
+            group.send(group_method), option_key_method, option_value_method, selected_key)
+
+          content_tag(:optgroup, option_tags, :label => group.send(group_label_method))
+        end.join.html_safe
+      end
+
+      # Returns a string of <tt><option></tt> tags, like <tt>options_for_select</tt>, but
+      # wraps them with <tt><optgroup></tt> tags.
+      #
+      # Parameters:
+      # * +grouped_options+ - Accepts a nested array or hash of strings. The first value serves as the
+      #   <tt><optgroup></tt> label while the second value must be an array of options. The second value can be a
+      #   nested array of text-value pairs. See <tt>options_for_select</tt> for more info.
+      #    Ex. ["North America",[["United States","US"],["Canada","CA"]]]
+      # * +selected_key+ - A value equal to the +value+ attribute for one of the <tt><option></tt> tags,
+      #   which will have the +selected+ attribute set. Note: It is possible for this value to match multiple options
+      #   as you might have the same option in multiple groups. Each will then get <tt>selected="selected"</tt>.
+      #
+      # Options:
+      # * <tt>:prompt</tt> - set to true or a prompt string. When the select element doesn't have a value yet, this
+      #   prepends an option with a generic prompt - "Please select" - or the given prompt string.
+      # * <tt>:divider</tt> - the divider for the options groups.
+      #
+      #   grouped_options = [
+      #    ['North America',
+      #      [['United States','US'],'Canada']],
+      #    ['Europe',
+      #      ['Denmark','Germany','France']]
+      #   ]
+      #   grouped_options_for_select(grouped_options)
+      #
+      #   grouped_options = {
+      #     'North America' => [['United States','US'], 'Canada'],
+      #     'Europe' => ['Denmark','Germany','France']
+      #   }
+      #   grouped_options_for_select(grouped_options)
+      #
+      # Possible output:
+      #   <optgroup label="North America">
+      #     <option value="US">United States</option>
+      #     <option value="Canada">Canada</option>
+      #   </optgroup>
+      #   <optgroup label="Europe">
+      #     <option value="Denmark">Denmark</option>
+      #     <option value="Germany">Germany</option>
+      #     <option value="France">France</option>
+      #   </optgroup>
+      #
+      #   grouped_options = [
+      #     [['United States','US'], 'Canada'],
+      #     ['Denmark','Germany','France']
+      #   ]
+      #   grouped_options_for_select(grouped_options, nil, divider: '---------')
+      #
+      # Possible output:
+      #   <optgroup label="---------">
+      #     <option value="US">United States</option>
+      #     <option value="Canada">Canada</option>
+      #   </optgroup>
+      #   <optgroup label="---------">
+      #     <option value="Denmark">Denmark</option>
+      #     <option value="Germany">Germany</option>
+      #     <option value="France">France</option>
+      #   </optgroup>
+      #
+      # <b>Note:</b> Only the <tt><optgroup></tt> and <tt><option></tt> tags are returned, so you still have to
+      # wrap the output in an appropriate <tt><select></tt> tag.
+      def grouped_options_for_select(grouped_options, selected_key = nil, options = {})
+        if options.is_a?(Hash)
+          prompt  = options[:prompt]
+          divider = options[:divider]
+        else
+          prompt  = options
+          message = "Passing the prompt to grouped_options_for_select as an argument is deprecated. " \
+                    "Please use an options hash like `{ prompt: #{prompt.inspect} }`."
+          ActiveSupport::Deprecation.warn message
+        end
+
+        body = "".html_safe
+
+        if prompt
+          body.safe_concat content_tag(:option, prompt_text(prompt), :value => "")
+        end
+
+        grouped_options.each do |container|
+          if divider
+            label = divider
+          else
+            label, container = container
+          end
+          body.safe_concat content_tag(:optgroup, options_for_select(container, selected_key), :label => label)
+        end
+
+        body
+      end
+
+      # Returns a string of option tags for pretty much any time zone in the
+      # world. Supply a ActiveSupport::TimeZone name as +selected+ to have it
+      # marked as the selected option tag. You can also supply an array of
+      # ActiveSupport::TimeZone objects as +priority_zones+, so that they will
+      # be listed above the rest of the (long) list. (You can use
+      # ActiveSupport::TimeZone.us_zones as a convenience for obtaining a list
+      # of the US time zones, or a Regexp to select the zones of your choice)
+      #
+      # The +selected+ parameter must be either +nil+, or a string that names
+      # a ActiveSupport::TimeZone.
+      #
+      # By default, +model+ is the ActiveSupport::TimeZone constant (which can
+      # be obtained in Active Record as a value object). The only requirement
+      # is that the +model+ parameter be an object that responds to +all+, and
+      # returns an array of objects that represent time zones.
+      #
+      # NOTE: Only the option tags are returned, you have to wrap this call in
+      # a regular HTML select tag.
+      def time_zone_options_for_select(selected = nil, priority_zones = nil, model = ::ActiveSupport::TimeZone)
+        zone_options = "".html_safe
+
+        zones = model.all
+        convert_zones = lambda { |list| list.map { |z| [ z.to_s, z.name ] } }
+
+        if priority_zones
+          if priority_zones.is_a?(Regexp)
+            priority_zones = zones.select { |z| z =~ priority_zones }
+          end
+
+          zone_options.safe_concat options_for_select(convert_zones[priority_zones], selected)
+          zone_options.safe_concat content_tag(:option, '-------------', :value => '', :disabled => 'disabled')
+          zone_options.safe_concat "\n"
+
+          zones = zones - priority_zones
+        end
+
+        zone_options.safe_concat options_for_select(convert_zones[zones], selected)
+      end
+
+      # Returns radio button tags for the collection of existing return values
+      # of +method+ for +object+'s class. The value returned from calling
+      # +method+ on the instance +object+ will be selected. If calling +method+
+      # returns +nil+, no selection is made.
+      #
+      # The <tt>:value_method</tt> and <tt>:text_method</tt> parameters are
+      # methods to be called on each member of +collection+. The return values
+      # are used as the +value+ attribute and contents of each radio button tag,
+      # respectively. They can also be any object that responds to +call+, such
+      # as a +proc+, that will be called for each member of the +collection+ to
+      # retrieve the value/text.
+      #
+      # Example object structure for use with this method:
+      #   class Post < ActiveRecord::Base
+      #     belongs_to :author
+      #   end
+      #   class Author < ActiveRecord::Base
+      #     has_many :posts
+      #     def name_with_initial
+      #       "#{first_name.first}. #{last_name}"
+      #     end
+      #   end
+      #
+      # Sample usage (selecting the associated Author for an instance of Post, <tt>@post</tt>):
+      #   collection_radio_buttons(:post, :author_id, Author.all, :id, :name_with_initial)
+      #
+      # If <tt>@post.author_id</tt> is already <tt>1</tt>, this would return:
+      #   <input id="post_author_id_1" name="post[author_id]" type="radio" value="1" checked="checked" />
+      #   <label for="post_author_id_1">D. Heinemeier Hansson</label>
+      #   <input id="post_author_id_2" name="post[author_id]" type="radio" value="2" />
+      #   <label for="post_author_id_2">D. Thomas</label>
+      #   <input id="post_author_id_3" name="post[author_id]" type="radio" value="3" />
+      #   <label for="post_author_id_3">M. Clark</label>
+      #
+      # It is also possible to customize the way the elements will be shown by
+      # giving a block to the method:
+      #   collection_radio_buttons(:post, :author_id, Author.all, :id, :name_with_initial) do |b|
+      #     b.label { b.radio_button }
+      #   end
+      #
+      # The argument passed to the block is a special kind of builder for this
+      # collection, which has the ability to generate the label and radio button
+      # for the current item in the collection, with proper text and value.
+      # Using it, you can change the label and radio button display order or
+      # even use the label as wrapper, as in the example above.
+      #
+      # The builder methods <tt>label</tt> and <tt>radio_button</tt> also accept
+      # extra html options:
+      #   collection_radio_buttons(:post, :author_id, Author.all, :id, :name_with_initial) do |b|
+      #     b.label(class: "radio_button") { b.radio_button(class: "radio_button") }
+      #   end
+      #
+      # There are also three special methods available: <tt>object</tt>, <tt>text</tt> and
+      # <tt>value</tt>, which are the current item being rendered, its text and value methods,
+      # respectively. You can use them like this:
+      #   collection_radio_buttons(:post, :author_id, Author.all, :id, :name_with_initial) do |b|
+      #      b.label(:"data-value" => b.value) { b.radio_button + b.text }
+      #   end
+      def collection_radio_buttons(object, method, collection, value_method, text_method, options = {}, html_options = {}, &block)
+        Tags::CollectionRadioButtons.new(object, method, self, collection, value_method, text_method, options, html_options).render(&block)
+      end
+
+      # Returns check box tags for the collection of existing return values of
+      # +method+ for +object+'s class. The value returned from calling +method+
+      # on the instance +object+ will be selected. If calling +method+ returns
+      # +nil+, no selection is made.
+      #
+      # The <tt>:value_method</tt> and <tt>:text_method</tt> parameters are
+      # methods to be called on each member of +collection+. The return values
+      # are used as the +value+ attribute and contents of each check box tag,
+      # respectively. They can also be any object that responds to +call+, such
+      # as a +proc+, that will be called for each member of the +collection+ to
+      # retrieve the value/text.
+      #
+      # Example object structure for use with this method:
+      #   class Post < ActiveRecord::Base
+      #     has_and_belongs_to_many :author
+      #   end
+      #   class Author < ActiveRecord::Base
+      #     has_and_belongs_to_many :posts
+      #     def name_with_initial
+      #       "#{first_name.first}. #{last_name}"
+      #     end
+      #   end
+      #
+      # Sample usage (selecting the associated Author for an instance of Post, <tt>@post</tt>):
+      #   collection_check_boxes(:post, :author_ids, Author.all, :id, :name_with_initial)
+      #
+      # If <tt>@post.author_ids</tt> is already <tt>[1]</tt>, this would return:
+      #   <input id="post_author_ids_1" name="post[author_ids][]" type="checkbox" value="1" checked="checked" />
+      #   <label for="post_author_ids_1">D. Heinemeier Hansson</label>
+      #   <input id="post_author_ids_2" name="post[author_ids][]" type="checkbox" value="2" />
+      #   <label for="post_author_ids_2">D. Thomas</label>
+      #   <input id="post_author_ids_3" name="post[author_ids][]" type="checkbox" value="3" />
+      #   <label for="post_author_ids_3">M. Clark</label>
+      #   <input name="post[author_ids][]" type="hidden" value="" />
+      #
+      # It is also possible to customize the way the elements will be shown by
+      # giving a block to the method:
+      #   collection_check_boxes(:post, :author_ids, Author.all, :id, :name_with_initial) do |b|
+      #     b.label { b.check_box }
+      #   end
+      #
+      # The argument passed to the block is a special kind of builder for this
+      # collection, which has the ability to generate the label and check box
+      # for the current item in the collection, with proper text and value.
+      # Using it, you can change the label and check box display order or even
+      # use the label as wrapper, as in the example above.
+      #
+      # The builder methods <tt>label</tt> and <tt>check_box</tt> also accept
+      # extra html options:
+      #   collection_check_boxes(:post, :author_ids, Author.all, :id, :name_with_initial) do |b|
+      #     b.label(class: "check_box") { b.check_box(class: "check_box") }
+      #   end
+      #
+      # There are also three special methods available: <tt>object</tt>, <tt>text</tt> and
+      # <tt>value</tt>, which are the current item being rendered, its text and value methods,
+      # respectively. You can use them like this:
+      #   collection_check_boxes(:post, :author_ids, Author.all, :id, :name_with_initial) do |b|
+      #      b.label(:"data-value" => b.value) { b.check_box + b.text }
+      #   end
+      def collection_check_boxes(object, method, collection, value_method, text_method, options = {}, html_options = {}, &block)
+        Tags::CollectionCheckBoxes.new(object, method, self, collection, value_method, text_method, options, html_options).render(&block)
+      end
+
+      private
+        def option_html_attributes(element)
+          if Array === element
+            element.select { |e| Hash === e }.reduce({}, :merge!)
+          else
+            {}
+          end
+        end
+
+        def option_text_and_value(option)
+          # Options are [text, value] pairs or strings used for both.
+          if !option.is_a?(String) && option.respond_to?(:first) && option.respond_to?(:last)
+            option = option.reject { |e| Hash === e } if Array === option
+            [option.first, option.last]
+          else
+            [option, option]
+          end
+        end
+
+        def option_value_selected?(value, selected)
+          Array(selected).include? value
+        end
+
+        def extract_selected_and_disabled(selected)
+          if selected.is_a?(Proc)
+            [selected, nil]
+          else
+            selected = Array.wrap(selected)
+            options = selected.extract_options!.symbolize_keys
+            selected_items = options.fetch(:selected, selected)
+            [selected_items, options[:disabled]]
+          end
+        end
+
+        def extract_values_from_collection(collection, value_method, selected)
+          if selected.is_a?(Proc)
+            collection.map do |element|
+              element.send(value_method) if selected.call(element)
+            end.compact
+          else
+            selected
+          end
+        end
+
+        def value_for_collection(item, value)
+          value.respond_to?(:call) ? value.call(item) : item.send(value)
+        end
+
+        def prompt_text(prompt)
+          prompt.kind_of?(String) ? prompt : I18n.translate('helpers.select.prompt', :default => 'Please select')
+        end
+    end
+
+    class FormBuilder
+      # Wraps ActionView::Helpers::FormOptionsHelper#select for form builders:
+      #
+      #   <%= form_for @post do |f| %>
+      #     <%= f.select :person_id, Person.all.collect {|p| [ p.name, p.id ] }, { include_blank: true }) %>
+      #     <%= f.submit %>
+      #   <% end %>
+      #
+      # Please refer to the documentation of the base helper for details.
+      def select(method, choices, options = {}, html_options = {})
+        @template.select(@object_name, method, choices, objectify_options(options), @default_options.merge(html_options))
+      end
+
+      # Wraps ActionView::Helpers::FormOptionsHelper#collection_select for form builders:
+      #
+      #   <%= form_for @post do |f| %>
+      #     <%= f.collection_select :person_id, Author.all, :id, :name_with_initial, prompt: true %>
+      #     <%= f.submit %>
+      #   <% end %>
+      #
+      # Please refer to the documentation of the base helper for details.
+      def collection_select(method, collection, value_method, text_method, options = {}, html_options = {})
+        @template.collection_select(@object_name, method, collection, value_method, text_method, objectify_options(options), @default_options.merge(html_options))
+      end
+
+      # Wraps ActionView::Helpers::FormOptionsHelper#grouped_collection_select for form builders:
+      #
+      #   <%= form_for @city do |f| %>
+      #     <%= f.grouped_collection_select :country_id, :country_id, @continents, :countries, :name, :id, :name %>
+      #     <%= f.submit %>
+      #   <% end %>
+      #
+      # Please refer to the documentation of the base helper for details.
+      def grouped_collection_select(method, collection, group_method, group_label_method, option_key_method, option_value_method, options = {}, html_options = {})
+        @template.grouped_collection_select(@object_name, method, collection, group_method, group_label_method, option_key_method, option_value_method, objectify_options(options), @default_options.merge(html_options))
+      end
+
+      # Wraps ActionView::Helpers::FormOptionsHelper#time_zone_select for form builders:
+      #
+      #   <%= form_for @user do |f| %>
+      #     <%= f.time_zone_select :time_zone, nil, include_blank: true %>
+      #     <%= f.submit %>
+      #   <% end %>
+      #
+      # Please refer to the documentation of the base helper for details.
+      def time_zone_select(method, priority_zones = nil, options = {}, html_options = {})
+        @template.time_zone_select(@object_name, method, priority_zones, objectify_options(options), @default_options.merge(html_options))
+      end
+
+      # Wraps ActionView::Helpers::FormOptionsHelper#collection_check_boxes for form builders:
+      #
+      #   <%= form_for @post do |f| %>
+      #     <%= f.collection_check_boxes :author_ids, Author.all, :id, :name_with_initial %>
+      #     <%= f.submit %>
+      #   <% end %>
+      #
+      # Please refer to the documentation of the base helper for details.
+      def collection_check_boxes(method, collection, value_method, text_method, options = {}, html_options = {}, &block)
+        @template.collection_check_boxes(@object_name, method, collection, value_method, text_method, objectify_options(options), @default_options.merge(html_options), &block)
+      end
+
+      # Wraps ActionView::Helpers::FormOptionsHelper#collection_radio_buttons for form builders:
+      #
+      #   <%= form_for @post do |f| %>
+      #     <%= f.collection_radio_buttons :author_id, Author.all, :id, :name_with_initial %>
+      #     <%= f.submit %>
+      #   <% end %>
+      #
+      # Please refer to the documentation of the base helper for details.
+      def collection_radio_buttons(method, collection, value_method, text_method, options = {}, html_options = {}, &block)
+        @template.collection_radio_buttons(@object_name, method, collection, value_method, text_method, objectify_options(options), @default_options.merge(html_options), &block)
+      end
+    end
+  end
+end