<commit_before>class Attendance < ActiveRecord::Base
  belongs_to  :user
  belongs_to  :event
end<commit_msg>Validate uniqueness of attendance user_id/event_id combination<commit_after>class Attendance < ActiveRecord::Base
  belongs_to  :user
  belongs_to  :event
  validates_uniqueness_of :user_id, scope: :event_id
end
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