Module: ActiveRecord::Suppressor
Relationships & Source Files | |
Namespace Children | |
Modules:
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Extension / Inclusion / Inheritance Descendants | |
Included In:
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Super Chains via Extension / Inclusion / Inheritance | |
Class Chain:
self,
::ActiveSupport::Concern
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Defined in: | activerecord/lib/active_record/suppressor.rb |
Overview
Suppressor
prevents the receiver from being saved during a given block.
For example, here’s a pattern of creating notifications when new comments are posted. (The notification may in turn trigger an email, a push notification, or just appear in the UI somewhere):
class Comment < ActiveRecord::Base
belongs_to :commentable, polymorphic: true
after_create -> { Notification.create! comment: self,
recipients: commentable.recipients }
end
That’s what you want the bulk of the time. New comment creates a new Notification. But there may well be off cases, like copying a commentable and its comments, where you don’t want that. So you’d have a concern something like this:
module Copyable
def copy_to(destination)
Notification.suppress do
# Copy logic that creates new comments that we do not want
# triggering notifications.
end
end
end
Class Method Summary
::ActiveSupport::Concern
- Extended
class_methods | Define class methods from given block. |
included | Evaluate given block in context of base class, so that you can write class macros here. |
prepended | Evaluate given block in context of base class, so that you can write class macros here. |