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|@@ -308,6 +308,8 @@ form_for(@article)|
|Notice how the short-style `form_for` invocation is conveniently the same, regardless of the record being new or existing. Record identification is smart enough to figure out if the record is new by asking `record.new_record?`. It also selects the correct path to submit to and the name based on the class of the object.|
|+Rails will also automatically set the class and id of the form appropriately: a form creating an article would have id and class `new_article`. If you were editing the article with id 23 the class would be set to `edit_article` and the id to `edit_article_23`. The attributes will be omitted or brevity in the rest of this guide.|
|WARNING: When you're using STI (single-table inheritance) with your models, you can't rely on record identification on a subclass if only their parent class is declared a resource. You will have to specify the model name, `:url` and `:method` explicitly.|
|@@ -582,8 +584,22 @@ File upload form|
|Scoping out form controls with `fields_for`|
|-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:|
|+`fields_for` creates a form builder in exactly the same way as `form_for` but doesn't create the actual `<form>` tags. In that sense it creates a scope around a specific model object like `form_for`, which is useful for specifying additional model objects in the same form. For example we might a Person model with an associated ContactDetail model. We could create a form for editing both like so:|
|+<% form_for @person do |person_form| %>|
|+ <%= person_form.text_field :name %>|
|+ <% fields_for @person.contact_detail do |contact_details_form| %>|
|+ <%= contact_details_form.text_field :phone_number %>|
|+ <% end %>|
|+<% end %>|
|+which produces the following output:|
|+<form action="/people/1" class="edit_person" id="edit_person_1" method="post">|
|+ <input id="person_name" name="person[name]" size="30" type="text" />|
|+ <input id="contact_detail_phone_number" name="contact_detail[phone_number]" size="30" type="text" />|
|Making custom form builders|