What are Active Record associations in Rails?

What are Active Record associations in Rails?

Active Record associations are a way to set up relationships between different models in Ruby on Rails, allowing you to easily connect and query related data.

Can you explain the different types of associations?

Sure! The main types of associations are: belongs_to, has_many, has_one, and has_many :through. Each serves a different purpose in defining relationships.

How do I set up a has_many association?

To set up a has_many association, you would define it in the model like this: class User < ApplicationRecord; has_many :posts; end. Then, in the Post model, you would use belongs_to :user.

What about polymorphic associations?

Polymorphic associations allow a model to belong to more than one other model on a single association. For example, a Comment model can belong to both Post and Photo models.