francois-blanchard/scope_no_associations.md

## scope_no_associations.md

      
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              scope_no_associations.md
            
          
    Scope for get objects with no association

class User < ActiveRecord::Base
  has_many :messages
  scope :without_messages, -> { where.not(id: Message.select(:user_id).uniq.compact) }
end

class Message < ActiveRecord::Base
  belongs_to :user
end