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 | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/actionview/lib/action_view/helpers/form_options_helper.rb b/actionview/lib/action_view/helpers/form_options_helper.rb index 728e633bbf..430051379d 100644 --- a/actionview/lib/action_view/helpers/form_options_helper.rb +++ b/actionview/lib/action_view/helpers/form_options_helper.rb @@ -548,7 +548,7 @@ module ActionView 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 @@ -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 |