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How does after_touch callback work in Rails? Is it called whenever an object is updated or only when a new object is created?
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Guideline #2: Asynchronous by defaultWhenever we add a callback, that is code that will execute before we can respond to a request. If a class defines 20 callbacks, that's 20 blocks of code that must execute before we can respond to the user.
Abstract Controller Callbacks Abstract Controller provides hooks during the life cycle of a controller action. Callbacks allow you to trigger logic during this cycle. Available callbacks are: after_action. append_after_action.
What is ActiveRecord? ActiveRecord is an ORM. It's a layer of Ruby code that runs between your database and your logic code. When you need to make changes to the database, you'll write Ruby code, and then run "migrations" which makes the actual changes to the database.
after_commit is a type of active record callback.
It'll be called only if the object is touched:
object.touch # after_touch will be called
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