diff options
Diffstat (limited to 'actionview/lib/action_view/helpers/form_options_helper.rb')
| -rw-r--r-- | actionview/lib/action_view/helpers/form_options_helper.rb | 63 |
1 files changed, 51 insertions, 12 deletions
diff --git a/actionview/lib/action_view/helpers/form_options_helper.rb b/actionview/lib/action_view/helpers/form_options_helper.rb index d3deee0df3..430051379d 100644 --- a/actionview/lib/action_view/helpers/form_options_helper.rb +++ b/actionview/lib/action_view/helpers/form_options_helper.rb @@ -35,8 +35,8 @@ module ActionView # <select name="post[person_id]" id="post_person_id"> # <option value="">None</option> # <option value="1">David</option> - # <option value="2" selected="selected">Sam</option> - # <option value="3">Tobias</option> + # <option value="2" selected="selected">Eileen</option> + # <option value="3">Rafael</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. @@ -48,8 +48,8 @@ module ActionView # <select name="post[person_id]" id="post_person_id"> # <option value="">Select Person</option> # <option value="1">David</option> - # <option value="2">Sam</option> - # <option value="3">Tobias</option> + # <option value="2">Eileen</option> + # <option value="3">Rafael</option> # </select> # # * <tt>:index</tt> - 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 @@ -112,8 +112,8 @@ module ActionView # <select name="post[person_id]" id="post_person_id"> # <option value=""></option> # <option value="1" selected="selected">David</option> - # <option value="2">Sam</option> - # <option value="3">Tobias</option> + # <option value="2">Eileen</option> + # <option value="3">Rafael</option> # </select> # # assuming the associated person has ID 1. @@ -456,7 +456,7 @@ module ActionView 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)) + content_tag("optgroup".freeze, option_tags, label: group.send(group_label_method)) end.join.html_safe end @@ -528,7 +528,7 @@ module ActionView body = "".html_safe if prompt - body.safe_concat content_tag(:option, prompt_text(prompt), value: "") + body.safe_concat content_tag("option".freeze, prompt_text(prompt), value: "") end grouped_options.each do |container| @@ -541,14 +541,14 @@ module ActionView end html_attributes = { label: label }.merge!(html_attributes) - body.safe_concat content_tag(:optgroup, options_for_select(container, selected_key), html_attributes) + body.safe_concat content_tag("optgroup".freeze, options_for_select(container, selected_key), html_attributes) 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 + # world. Supply an 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 @@ -556,7 +556,7 @@ module ActionView # 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. + # an ActiveSupport::TimeZone. # # By default, +model+ is the ActiveSupport::TimeZone constant (which can # be obtained in Active Record as a value object). The only requirement @@ -577,7 +577,7 @@ module ActionView end zone_options.safe_concat options_for_select(convert_zones[priority_zones], selected) - zone_options.safe_concat content_tag(:option, '-------------', value: '', disabled: true) + zone_options.safe_concat content_tag("option".freeze, '-------------', value: '', disabled: true) zone_options.safe_concat "\n" zones = zones - priority_zones @@ -644,6 +644,24 @@ module ActionView # 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 + # + # ==== Gotcha + # + # The HTML specification says when nothing is select on a collection of radio buttons + # web browsers do not send any value to server. + # Unfortunately this introduces a gotcha: + # if a +User+ model has a +category_id+ field, and in the form none category is selected no +category_id+ parameter is sent. So, + # any strong parameters idiom like + # + # params.require(:user).permit(...) + # + # will raise an error since no +{user: ...}+ will be present. + # + # To prevent this the helper generates an auxiliary hidden field before + # every collection of radio buttons. The hidden field has the same name as collection radio button and blank value. + # + # In case if you don't want the helper to generate this hidden field you can specify + # <tt>include_hidden: false</tt> option. 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 @@ -707,6 +725,27 @@ module ActionView # 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 + # + # ==== Gotcha + # + # When no selection is made for a collection of checkboxes most + # web browsers will not send any value. + # + # For example, if we have a +User+ model with +category_ids+ field and we + # have the following code in our update action: + # + # @user.update(params[:user]) + # + # If no +category_ids+ are selected then we can safely assume this field + # will not be updated. + # + # This is possible thanks to a hidden field generated by the helper method + # for every collection of checkboxes. + # This hidden field is given the same field name as the checkboxes with a + # blank value. + # + # In the rare case you don't want this hidden field, you can pass the + # <tt>include_hidden: false</tt> option to the helper method. 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 |