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Explain what the interceptor is used for and how to remove it.
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Use a preview interceptor to search for inline cid: urls in src
attributes and convert them to data urls.
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Adds `config.action_mailer.preview_enabled`
This allows mail previewing to be enabled easily in non-development
environments such as staging. The default is set to true for development
so no changes should be required to existing Rails applications.
The mail preview path can still be configured using the existing
`config.action_mailer.preview_path` configuration option.
Adding this avoids devs from having to do stuff like:
https://gist.github.com/lengarvey/fa2c9bd6cdbeba96526a
Update actionmailer/CHANGELOG with new configuration.
Update configuring guide with new configuratation.
Add `config.action_mailer.preview_path` to configuring guide.
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Since preview_path is read from ActionMailer::Base when previewing, subclasses
can’t change it so don’t there's no need for the extra overhead imposed by using it.
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To support the ability for tools like CSS style inliners to operate on emails
being previewed this commit adds a hook in a similar fashion to the existing
delivery interceptor hook, e.g:
class CSSInlineStyler
def self.previewing_email(message)
# inline CSS styles
end
end
ActionMailer::Base.register_preview_interceptor CSSInlineStyler
Fixes #13622.
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Only config.autoload_paths is frozen, so add the preview_path
to ActiveSupport::Dependencies.autoload_paths directly in an
after_initialize block. Also protect against a blank preview_path
being added to autoload_paths which can cause a serious slowdown
as Dir[] tries to load all *_preview.rb files under /
Fixes #13372
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