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launchkit-codes/habtm_scope.rb

Created December 17, 2014 15:48
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Using scope with HABTM
Raw
habtm_scope.rb
class Category < ActiveRecord::Base
has_and_belongs_to_many :products
end
class Product < ActiveRecord::Base
has_and_belongs_to_many :categories
# :c can be an array of categories.
scope :by_categories, ->(c) { includes(:categories).where(categories: {id: c}) }
end
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