transferred Code Ocean from original repository to GitHub

app/models/concerns/user.rb

@@ -0,0 +1,30 @@
+module User
+  extend ActiveSupport::Concern
+
+  ROLES = %w[admin teacher]
+
+  included do
+    belongs_to :consumer
+    has_many :exercises, as: :user
+    has_many :file_types, as: :user
+    has_many :submissions, as: :user
+
+    scope :with_submissions, -> { where('id IN (SELECT user_id FROM submissions)') }
+  end
+
+  ROLES.each do |role|
+    define_method("#{role}?") { self.try(:role) == role }
+  end
+
+  def external?
+    is_a?(ExternalUser)
+  end
+
+  def internal?
+    is_a?(InternalUser)
+  end
+
+  def to_s
+    name
+  end
+end