transferred Code Ocean from original repository to GitHub

app/models/concerns/creation.rb

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+module Creation
+  extend ActiveSupport::Concern
+
+  included do
+    belongs_to :user, polymorphic: true
+    alias_method :author, :user
+    alias_method :creator, :user
+
+    validates :user_id, presence: true
+    validates :user_type, presence: true
+  end
+end