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app/models/mark_file.rb

@@ -0,0 +1,5 @@
+class MarkFile < ApplicationRecord
+  belongs_to :pull_request
+
+
+end

app/models/pull_request.rb

@@ -43,6 +43,7 @@ class PullRequest < ApplicationRecord
   has_many :reviews, dependent: :destroy
   has_many :pull_requests_reviewers, dependent: :destroy
   has_many :reviewers, through: :pull_requests_reviewers
+  has_many :mark_files, dependent: :destroy
 
   scope :merged_and_closed, ->{where.not(status: 0)}
   scope :opening, -> {where(status: 0)}