module RailsConnector

  # The permissions assigned to an Obj.
  class Permission < CmsBaseModel
    belongs_to :object, :class_name => 'Obj', :foreign_key => 'object_id'

    # Returns the Array of the names of the user groups to which read permission has been granted.
    def self.read
      user_groups_for_permission_type(1)
    end

    # Returns the Array of the names of the user groups to which write permission has been granted
    def self.write
      user_groups_for_permission_type(2)
    end

    # Returns the Array of the names of the user groups to which root permission has been granted
    def self.root
      user_groups_for_permission_type(3)
    end

    # Returns the Array of the names of the user groups to which the children creation permission has been granted.
    def self.create_children
      user_groups_for_permission_type(4)
    end

    # Returns the Array of the names of the user groups to which live read permission has been granted.
    def self.live
      user_groups_for_permission_type(5)
    end

    private

    def self.user_groups_for_permission_type(permission_type)
      # Field name "user_login" is a legacy from CM tables.
      # Actually the field contains the user group.
      select(:user_login).where(:permission_type => permission_type).map(&:user_login)
    end
  end

end