Add association between repository rows & my modules

app/models/repository_row_my_module.rb

@@ -0,0 +1,12 @@
+class RepositoryRowMyModule < ActiveRecord::Base
+  validates :repository_row, :my_module, presence: true
+
+  # One row can only be assigned once to a specific module
+  validates_uniqueness_of :repository_row_id, :scope => :my_module_id
+
+  belongs_to :assigned_by, foreign_key: 'assigned_by_id', class_name: 'User'
+  belongs_to :repository_row,
+    inverse_of: :repository_row_my_modules
+  belongs_to :my_module,
+    inverse_of: :repository_row_my_modules
+end

db/migrate/20170530150200_add_repository_row_my_modules.rb

@@ -0,0 +1,12 @@
+class AddRepositoryRowMyModules < ActiveRecord::Migration
+  def change
+    create_table :repository_row_my_modules do |t|
+      t.belongs_to :repository_row, index: true
+      t.belongs_to :my_module, index: true
+      t.integer :assigned_by_id, null: false
+      t.timestamps null: true
+    end
+
+    add_foreign_key :repository_row_my_modules, :users, column: :assigned_by_id
+  end
+end