How does ruby on rails dynamically define `find_by_id`, `find_by_name` methods?

Question

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?

Possible duplicate of define_method: How to dynamically create methods with arguments — Bhojendra Rauniyar
– Bhojendra Rauniyar, Commented Nov 2, 2018 at 7:28

Vincent Rolea · Accepted Answer · 2018-11-02 10:00:57Z

2

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.

answered Nov 2, 2018 at 10:00

Vincent Rolea

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