Custom model callbacks in RubyOnRails

RubyOnRails provides us with many model callbacks around the object's lifecycle when object is being created, updated or destroyed. For example: before_create, after_create, before_update, after_destroy etc. We use them to write & run our code around the object's lifecycle by defining a method and associating them as one of the callbacks.

But then how can we make a piece of code execute as a callback for any another defined method except create, update, save and destroy? For example, let's say we have a model Article and we want to execute something just before and after an article is being published without hooking into model's before_save and after_save callbacks?

RubyOnRails or more precisely ActiveRecord provides us with a module ActiveModel::Callbacks, which allows us to define and register custom callbacks using define_model_callbacks method. Lets have a look at the snippet below for the above scenario:
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