transferred Code Ocean from original repository to GitHub

app/models/concerns/context.rb

@@ -0,0 +1,20 @@
+module Context
+  extend ActiveSupport::Concern
+
+  included do
+    has_many :files, as: :context, class: CodeOcean::File
+    accepts_nested_attributes_for :files
+  end
+
+  def add_file(file_attributes)
+    file = files.create(file_attributes)
+    save
+    file
+  end
+
+  def add_file!(file_attributes)
+    file = files.create!(file_attributes)
+    save!
+    file
+  end
+end

app/models/concerns/creation.rb

@@ -0,0 +1,12 @@
+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

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