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Actionable errors let's you dispatch actions from Rails' error pages. This
can help you save time if you have a clear action for the resolution of
common development errors.
The de-facto example are pending migrations. Every time pending migrations
are found, a middleware raises an error. With actionable errors, you can
run the migrations right from the error page. Other examples include Rails
plugins that need to run a rake task to setup themselves. They can now
raise actionable errors to run the setup straight from the error pages.
Here is how to define an actionable error:
```ruby
class PendingMigrationError < MigrationError #:nodoc:
include ActiveSupport::ActionableError
action "Run pending migrations" do
ActiveRecord::Tasks::DatabaseTasks.migrate
end
end
```
To make an error actionable, include the `ActiveSupport::ActionableError`
module and invoke the `action` class macro to define the action. An action
needs a name and a procedure to execute. The name is shown as the name of a
button on the error pages. Once clicked, it will invoke the given
procedure.
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Long source lines cause line wrapping in the extracted
source section of the rescue handler page which can make
the line numbers not match up with the source lines.
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Provide the ability to extract the source code of the entire exception stack
trace, not just the frame raising the error. This improves debugging
capability of the error page, especially for framework-related errors.
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Using the white-space: pre-wrap adds extra line breaks to prevent the text from breaking out of the element's box. In this case single line output can be extremely long, breaking out the <body> element.
See for reference: http://www.quirksmode.org/css/whitespace.html
Before: http://link.olivierlacan.com/BVU4
After: http://link.olivierlacan.com/BUfM
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font choices for Mac users.
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middleware.
This commit breaks all exception catching plugins like ExceptionNotifier. These plugins should be rewritten as middleware instead overriding Controller#rescue_action_in_public.
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