In Rails you use class-level declarations such as has_many, belongs_to, and other so-called “macros” all the time. Developers often assume these are magic. They're not! It's just Ruby code.
In this short video tutorial we recreate a simplified version of the has_many declaration from scratch so you understand how to apply this same powerful technique in your own Ruby code!
To see more and get the source code, go to:
https://pragmaticstudio.com/tutorials/ruby-macros
