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Diffstat (limited to 'guides/source/layouts_and_rendering.md')
| -rw-r--r-- | guides/source/layouts_and_rendering.md | 46 |
1 files changed, 43 insertions, 3 deletions
diff --git a/guides/source/layouts_and_rendering.md b/guides/source/layouts_and_rendering.md index eb3c188d38..329d501ce0 100644 --- a/guides/source/layouts_and_rendering.md +++ b/guides/source/layouts_and_rendering.md @@ -316,12 +316,13 @@ NOTE: Unless overridden, your response returned from this render option will be #### Options for `render` -Calls to the `render` method generally accept four options: +Calls to the `render` method generally accept five options: * `:content_type` * `:layout` * `:location` * `:status` +* `:formats` ##### The `:content_type` Option @@ -430,6 +431,15 @@ Rails understands both numeric status codes and the corresponding symbols shown NOTE: If you try to render content along with a non-content status code (100-199, 204, 205 or 304), it will be dropped from the response. +##### The `:formats` Option + +Rails uses the format specified in request (or `:html` by default). You can change this adding the `:formats` option with a symbol or an array: + +```ruby +render formats: :xml +render formats: [:json, :xml] +``` + #### Finding Layouts To find the current layout, Rails first looks for a file in `app/views/layouts` with the same base name as the controller. For example, rendering actions from the `PhotosController` class will use `app/views/layouts/photos.html.erb` (or `app/views/layouts/photos.builder`). If there is no such controller-specific layout, Rails will use `app/views/layouts/application.html.erb` or `app/views/layouts/application.builder`. If there is no `.erb` layout, Rails will use a `.builder` layout if one exists. Rails also provides several ways to more precisely assign specific layouts to individual controllers and actions. @@ -1039,7 +1049,7 @@ As you already could see from the previous sections of this guide, `yield` is a <p> Name contains: <%= f.text_field :name_contains %> </p> - <%= end %> + <% end %> ``` * `roles/index.html.erb` @@ -1049,7 +1059,7 @@ As you already could see from the previous sections of this guide, `yield` is a <p> Title contains: <%= f.text_field :title_contains %> </p> - <%= end %> + <% end %> ``` * `shared/_search_filters.html.erb` @@ -1114,6 +1124,36 @@ You can also pass local variables into partials, making them even more powerful Although the same partial will be rendered into both views, Action View's submit helper will return "Create Zone" for the new action and "Update Zone" for the edit action. +To pass a local variable to a partial in only specific cases use the `local_assigns`. + +* `index.html.erb` + + ```erb + <%= render user.articles %> + ``` + +* `show.html.erb` + + ```erb + <%= render article, full: true %> + ``` + +* `_articles.html.erb` + + ```erb + <%= content_tag_for :article, article do |article| %> + <h2><%= article.title %></h2> + + <% if local_assigns[:full] %> + <%= simple_format article.body %> + <% else %> + <%= truncate article.body %> + <% end %> + <% end %> + ``` + +This way it is possible to use the partial without the need to declare all local variables. + Every partial also has a local variable with the same name as the partial (minus the underscore). You can pass an object in to this local variable via the `:object` option: ```erb |