diff options
Diffstat (limited to 'actionpack/lib')
| -rw-r--r-- | actionpack/lib/action_view/helpers/form_helper.rb | 25 |
1 files changed, 18 insertions, 7 deletions
diff --git a/actionpack/lib/action_view/helpers/form_helper.rb b/actionpack/lib/action_view/helpers/form_helper.rb index 6de53bbb95..865914c1b7 100644 --- a/actionpack/lib/action_view/helpers/form_helper.rb +++ b/actionpack/lib/action_view/helpers/form_helper.rb @@ -16,17 +16,28 @@ module ActionView # Form helpers are designed to make working with resources much easier # compared to using vanilla HTML. # - # Forms for models are created with +form_for+. That method yields a form - # builder that knows the model the form is about. The form builder is thus - # able to generate default values for input fields that correspond to model - # attributes, and also convenient names, and IDs, etc. + # Typically, a form designed to create or update a resource reflects the + # identity of the resource in several ways: (i) the url that the form is + # sent to (the form element's +action+ attribute) should result in a request + # being routed to the appropriate controller action (with the appropriate <tt>:id</tt> + # parameter in the case of an existing resource), and (ii) input fields should + # be named in such a way that in the controller their values appear in the + # appropriate places within the +params+ hash. Also for an existing record, + # when the form is initially displayed, input fields corresponding to attributes + # of the resource should show the current values of those attributes. # - # Conventions in the generated field names allow controllers to receive form - # data nicely structured in +params+ with no effort on your side. + # In Rails, this is usually achieved by creating the form using +form_for+ and + # a number of related helper methods. +form_for+ generates an appropriate <tt>form</tt> + # tag and yields a form builder object that knows the model the form is about. + # Input fields are created by calling methods defined on the form builder, which + # means they are able to generate the appropriate names and default values + # corresponding to the model attributes, as well as convenient IDs, etc. + # Conventions in the generated field names allow controllers to receive form data + # nicely structured in +params+ with no effort on your side. # # For example, to create a new person you typically set up a new instance of # +Person+ in the <tt>PeopleController#new</tt> action, <tt>@person</tt>, and - # pass it to +form_for+: + # in the view template pass that object to +form_for+: # # <%= form_for @person do |f| %> # <%= f.label :first_name %>: |