上映会のし組み作り（#295） (#296)

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Co-authored-by: miteruzo <miteruzo@naver.com>
Reviewed-on: #296

backend/app/models/theatre_comment.rb

@@ -0,0 +1,8 @@
+class TheatreComment < ApplicationRecord
+  include MyDiscard
+
+  self.primary_key = :theatre_id, :no
+
+  belongs_to :theatre
+end
+