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Update the rendering guide to match the current behavior

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In the latest security releases render with a trailing slash no more call
render :file.

Also add a note about the security implications of using it with user
parameters.
This commit is contained in:
Rafael Mendonça França 2016-03-05 20:07:27 -03:00
parent ddf4c953ae
commit 403c57aec0
1 changed files with 9 additions and 10 deletions
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17
guides/source/layouts_and_rendering.md
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@ -149,23 +149,22 @@ render template: "products/show"
#### Rendering an Arbitrary File #### Rendering an Arbitrary File
The `render` method can also use a view that's entirely outside of your application (perhaps you're sharing views between two Rails applications): The `render` method can also use a view that's entirely outside of your application:
```ruby
render "/u/apps/warehouse_app/current/app/views/products/show"
```
Rails determines that this is a file render because of the leading slash character. To be explicit, you can use the `:file` option (which was required on Rails 2.2 and earlier):
```ruby ```ruby
render file: "/u/apps/warehouse_app/current/app/views/products/show" render file: "/u/apps/warehouse_app/current/app/views/products/show"
``` ```
The `:file` option takes an absolute file-system path. Of course, you need to have rights to the view that you're using to render the content. The `:file` option takes an absolute file-system path. Of course, you need to have rights
to the view that you're using to render the content.
NOTE: Using the `:file` option in combination with users input can lead to security problems
since an attacker could use this action to access security sensitive files in your file system.
NOTE: By default, the file is rendered using the current layout. NOTE: By default, the file is rendered using the current layout.
TIP: If you're running Rails on Microsoft Windows, you should use the `:file` option to render a file, because Windows filenames do not have the same format as Unix filenames. TIP: If you're running Rails on Microsoft Windows, you should use the `:file` option to
render a file, because Windows filenames do not have the same format as Unix filenames.
#### Wrapping it up #### Wrapping it up