Ruby on Rails - has_and_belongs_to_many association in ruby on rails - ruby on rails tutorial - rails guides - rails tutorial - ruby rails

A has_and_belongs_to_many association creates a direct many-to-many connection with another model, with no intervening model.

Example

if our application includes assemblies and parts, with each assembly having many parts and each part appearing in many assemblies.
We could declare the models this way:

class Assembly < ApplicationRecord
  has_and_belongs_to_many :parts
end

class Part < ApplicationRecord
  has_and_belongs_to_many :assemblies
end

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Ruby on Rails - has_and_belongs_to_many association in ruby on rails - ruby on rails tutorial - rails guides - rails tutorial - ruby rails

Example

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