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Merge pull request #28912 from kaspth/getting-started-form-with

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[ci skip] form_with in the getting started guide.
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Kasper Timm Hansen 2017-08-21 19:18:59 +02:00 committed by GitHub
commit 39e6eea9e5
2 changed files with 100 additions and 67 deletions
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30
actionview/lib/action_view/helpers/form_helper.rb
View file

@ -543,6 +543,36 @@ module ActionView
# and adds an authenticity token needed for cross site request forgery
# protection.
#
# === Resource-oriented style
#
# In many of the examples just shown, the +:model+ passed to +form_with+
# is a _resource_. It corresponds to a set of RESTful routes, most likely
# defined via +resources+ in <tt>config/routes.rb</tt>.
#
# So when passing such a model record, Rails infers the URL and method.
#
# <%= form_with model: @post do |form| %>
# ...
# <% end %>
#
# is then equivalent to something like:
#
# <%= form_with scope: :post, url: post_path(@post), method: :patch do |form| %>
# ...
# <% end %>
#
# And for a new record
#
# <%= form_with model: Post.new do |form| %>
# ...
# <% end %>
#
# is equivalent to something like:
#
# <%= form_with scope: :post, url: posts_path do |form| %>
# ...
# <% end %>
#
# ==== +form_with+ options
#
# * <tt>:url</tt> - The URL the form submits to. Akin to values passed to

137
guides/source/getting_started.md
View file

@ -509,23 +509,23 @@ harmoniously! It's time to create the form for a new article.
To create a form within this template, you will use a *form
builder*. The primary form builder for Rails is provided by a helper
method called `form_for`. To use this method, add this code into
method called `form_with`. To use this method, add this code into
`app/views/articles/new.html.erb`:
```html+erb
<%= form_for :article do |f| %>
<%= form_with scope: :article, local: true do |form| %>
<p>
<%= f.label :title %><br>
<%= f.text_field :title %>
<%= form.label :title %><br>
<%= form.text_field :title %>
</p>
<p>
<%= f.label :text %><br>
<%= f.text_area :text %>
<%= form.label :text %><br>
<%= form.text_area :text %>
</p>
<p>
<%= f.submit %>
<%= form.submit %>
</p>
<% end %>
```
@ -533,12 +533,12 @@ method called `form_for`. To use this method, add this code into
If you refresh the page now, you'll see the exact same form from our example above.
Building forms in Rails is really just that easy!
When you call `form_for`, you pass it an identifying object for this
form. In this case, it's the symbol `:article`. This tells the `form_for`
When you call `form_with`, you pass it an identifying scope for this
form. In this case, it's the symbol `:article`. This tells the `form_with`
helper what this form is for. Inside the block for this method, the
`FormBuilder` object - represented by `f` - is used to build two labels and two
`FormBuilder` object - represented by `form` - is used to build two labels and two
text fields, one each for the title and text of an article. Finally, a call to
`submit` on the `f` object will create a submit button for the form.
`submit` on the `form` object will create a submit button for the form.
There's one problem with this form though. If you inspect the HTML that is
generated, by viewing the source of the page, you will see that the `action`
@ -547,15 +547,15 @@ this route goes to the very page that you're on right at the moment, and that
route should only be used to display the form for a new article.
The form needs to use a different URL in order to go somewhere else.
This can be done quite simply with the `:url` option of `form_for`.
This can be done quite simply with the `:url` option of `form_with`.
Typically in Rails, the action that is used for new form submissions
like this is called "create", and so the form should be pointed to that action.
Edit the `form_for` line inside `app/views/articles/new.html.erb` to look like
Edit the `form_with` line inside `app/views/articles/new.html.erb` to look like
this:
```html+erb
<%= form_for :article, url: articles_path do |f| %>
<%= form_with scope: :article, url: articles_path, local: true do |form| %>
```
In this example, the `articles_path` helper is passed to the `:url` option.
@ -592,6 +592,10 @@ familiar error:
You now need to create the `create` action within the `ArticlesController` for
this to work.
NOTE: by default `form_with` submits forms using Ajax thereby skipping full page
redirects. To make this guide easier to get into we've disabled that with
`local: true` for now.
### Creating articles
To make the "Unknown action" go away, you can define a `create` action within
@ -956,7 +960,7 @@ Now, add another link in `app/views/articles/new.html.erb`, underneath the
form, to go back to the `index` action:
```erb
<%= form_for :article, url: articles_path do |f| %>
<%= form_with scope: :article, url: articles_path, local: true do |form| %>
...
<% end %>
@ -1067,7 +1071,7 @@ something went wrong. To do that, you'll modify
`app/views/articles/new.html.erb` to check for error messages:
```html+erb
<%= form_for :article, url: articles_path do |f| %>
<%= form_with scope: :article, url: articles_path, local: true do |form| %>
<% if @article.errors.any? %>
<div id="error_explanation">
@ -1084,17 +1088,17 @@ something went wrong. To do that, you'll modify
<% end %>
<p>
<%= f.label :title %><br>
<%= f.text_field :title %>
<%= form.label :title %><br>
<%= form.text_field :title %>
</p>
<p>
<%= f.label :text %><br>
<%= f.text_area :text %>
<%= form.label :text %><br>
<%= form.text_area :text %>
</p>
<p>
<%= f.submit %>
<%= form.submit %>
</p>
<% end %>
@ -1159,7 +1163,7 @@ it look as follows:
```html+erb
<h1>Edit article</h1>
<%= form_for(@article) do |f| %>
<%= form_with(model: @article) do |form| %>
<% if @article.errors.any? %>
<div id="error_explanation">
@ -1176,17 +1180,17 @@ it look as follows:
<% end %>
<p>
<%= f.label :title %><br>
<%= f.text_field :title %>
<%= form.label :title %><br>
<%= form.text_field :title %>
</p>
<p>
<%= f.label :text %><br>
<%= f.text_area :text %>
<%= form.label :text %><br>
<%= form.text_area :text %>
</p>
<p>
<%= f.submit %>
<%= form.submit %>
</p>
<% end %>
@ -1202,12 +1206,11 @@ This option tells Rails that we want this form to be submitted
via the `PATCH` HTTP method which is the HTTP method you're expected to use to
**update** resources according to the REST protocol.
The first parameter of `form_for` can be an object, say, `@article` which would
The arguments to `form_with` could be model objects, say, `model: @article` which would
cause the helper to fill in the form with the fields of the object. Passing in a
symbol (`:article`) with the same name as the instance variable (`@article`)
also automagically leads to the same behavior.
More details can be found in [form_for documentation]
(http://api.rubyonrails.org/classes/ActionView/Helpers/FormHelper.html#method-i-form_for).
symbol scope (`scope: :article`) just creates the fields but without anything filled into them.
More details can be found in [form_with documentation]
(http://api.rubyonrails.org/classes/ActionView/Helpers/FormHelper.html#method-i-form_with).
Next, we need to create the `update` action in
`app/controllers/articles_controller.rb`.
@ -1304,7 +1307,7 @@ Create a new file `app/views/articles/_form.html.erb` with the following
content:
```html+erb
<%= form_for @article do |f| %>
<%= form_with model: @article, local: true do |form| %>
<% if @article.errors.any? %>
<div id="error_explanation">
@ -1321,29 +1324,29 @@ content:
<% end %>
<p>
<%= f.label :title %><br>
<%= f.text_field :title %>
<%= form.label :title %><br>
<%= form.text_field :title %>
</p>
<p>
<%= f.label :text %><br>
<%= f.text_area :text %>
<%= form.label :text %><br>
<%= form.text_area :text %>
</p>
<p>
<%= f.submit %>
<%= form.submit %>
</p>
<% end %>
```
Everything except for the `form_for` declaration remained the same.
The reason we can use this shorter, simpler `form_for` declaration
Everything except for the `form_with` declaration remained the same.
The reason we can use this shorter, simpler `form_with` declaration
to stand in for either of the other forms is that `@article` is a *resource*
corresponding to a full set of RESTful routes, and Rails is able to infer
which URI and method to use.
For more information about this use of `form_for`, see [Resource-oriented style]
(http://api.rubyonrails.org/classes/ActionView/Helpers/FormHelper.html#method-i-form_for-label-Resource-oriented+style).
For more information about this use of `form_with`, see [Resource-oriented style]
(http://api.rubyonrails.org/classes/ActionView/Helpers/FormHelper.html#method-i-form_with-label-Resource-oriented+style).
Now, let's update the `app/views/articles/new.html.erb` view to use this new
partial, rewriting it completely:
@ -1682,17 +1685,17 @@ So first, we'll wire up the Article show template
</p>
<h2>Add a comment:</h2>
<%= form_for([@article, @article.comments.build]) do |f| %>
<%= form_with(model: [ @article, @article.comments.build ], local: true) do |form| %>
<p>
<%= f.label :commenter %><br>
<%= f.text_field :commenter %>
<%= form.label :commenter %><br>
<%= form.text_field :commenter %>
</p>
<p>
<%= f.label :body %><br>
<%= f.text_area :body %>
<%= form.label :body %><br>
<%= form.text_area :body %>
</p>
<p>
<%= f.submit %>
<%= form.submit %>
</p>
<% end %>
@ -1701,7 +1704,7 @@ So first, we'll wire up the Article show template
```
This adds a form on the `Article` show page that creates a new comment by
calling the `CommentsController` `create` action. The `form_for` call here uses
calling the `CommentsController` `create` action. The `form_with` call here uses
an array, which will build a nested route, such as `/articles/1/comments`.
Let's wire up the `create` in `app/controllers/comments_controller.rb`:
@ -1763,17 +1766,17 @@ add that to the `app/views/articles/show.html.erb`.
<% end %>
<h2>Add a comment:</h2>
<%= form_for([@article, @article.comments.build]) do |f| %>
<%= form_with(model: [ @article, @article.comments.build ]) do |form| %>
<p>
<%= f.label :commenter %><br>
<%= f.text_field :commenter %>
<%= form.label :commenter %><br>
<%= form.text_field :commenter %>
</p>
<p>
<%= f.label :body %><br>
<%= f.text_area :body %>
<%= form.label :body %><br>
<%= form.text_area :body %>
</p>
<p>
<%= f.submit %>
<%= form.submit %>
</p>
<% end %>
@ -1829,17 +1832,17 @@ following:
<%= render @article.comments %>
<h2>Add a comment:</h2>
<%= form_for([@article, @article.comments.build]) do |f| %>
<%= form_with(model: [ @article, @article.comments.build ]) do |form| %>
<p>
<%= f.label :commenter %><br>
<%= f.text_field :commenter %>
<%= form.label :commenter %><br>
<%= form.text_field :commenter %>
</p>
<p>
<%= f.label :body %><br>
<%= f.text_area :body %>
<%= form.label :body %><br>
<%= form.text_area :body %>
</p>
<p>
<%= f.submit %>
<%= form.submit %>
</p>
<% end %>
@ -1859,17 +1862,17 @@ Let us also move that new comment section out to its own partial. Again, you
create a file `app/views/comments/_form.html.erb` containing:
```html+erb
<%= form_for([@article, @article.comments.build]) do |f| %>
<%= form_with(model: [ @article, @article.comments.build ]) do |form| %>
<p>
<%= f.label :commenter %><br>
<%= f.text_field :commenter %>
<%= form.label :commenter %><br>
<%= form.text_field :commenter %>
</p>
<p>
<%= f.label :body %><br>
<%= f.text_area :body %>
<%= form.label :body %><br>
<%= form.text_area :body %>
</p>
<p>
<%= f.submit %>
<%= form.submit %>
</p>
<% end %>
```