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Ruby Tips - How to figure out where a method is defined

The other day when I was dabbling with the huge codebase, I was wondering where a particular method was being declared for a specific method. I wanted to know this because my greps didn't turn out to volatile and didn't return any results



The Solution

The Ruby interpreter has certain methods that can be used for identifying under which module or class, the particular method is being defined. See the example below.


So using the .source_location you will be able to figure which file it has been declared.

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Rails Engine - How To Keep Your Engine Migrations Abstracted From Your Host Rails App

Have you ever worked on building a Rails Engine and wanted to keep the models, the migrations and everything inside the engine rather than using a generator to copy paste them into your host Rails App? That's a problem everybody faces one time or the other when building Rails Engines to abstract out your huge Rails App. I have found one such solutions that can be helpful for you to keep them separate. Here is a solution for it.
Problem Statement: Instead of using

    rails g my_engine:install
to copy paste the migrations from engine to your rails app, you want to just keep the migrations inside the Rails Engine and do not bother about it.
Solution:  Add the following lines to your engine, so that your engine's migration files are added to the rails app as well.

Now you can do the following from your rails app to run your migrations as you always do:

rake db:migrate
Hope it helps you! If it does help you, give me a shoutout below!

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