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I am interested in understanding how find_by_(column_name) works. How does Ruby on Rails dynamically define the method on calling find_by_id, find_by_name, etc?

sawa
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Harsimar Sandhu
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    Possible duplicate of [define\_method: How to dynamically create methods with arguments](https://stackoverflow.com/questions/38233060/define-method-how-to-dynamically-create-methods-with-arguments) – Bhojendra Rauniyar Nov 02 '18 at 07:28

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This is the power of meta programmation in Ruby, and more specifically the method_missing method: https://ruby-doc.org/core-2.1.0/BasicObject.html#method-i-method_missing

When you call a method on an instance of a Class that is not defined in that class, the method_missing catches it and you can handle it there.

Vincent Rolea
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