class CreatePermissionPolicies < ActiveRecord::Migration[5.2]
  def up
    if !table_exists?(:permission_policies)
      create_table :permission_policies do |t|
        t.belongs_to :resource, polymorphic: true, index: false
        t.string :policy_type
        t.timestamps
      end
      add_index :permission_policies, [:resource_type, :resource_id], unique: true
    end
  end
end