# File lib/data_mapper/constraints/adapters/do_adapter.rb, line 85
        def destroy_relationship_constraint(relationship)
          return false unless valid_relationship_for_constraint?(relationship)

          storage_name    = relationship.source_model.storage_name(name)
          constraint_name = constraint_name(storage_name, relationship.name)

          return false unless constraint_exists?(storage_name, constraint_name)

          destroy_constraints_statement =
            destroy_constraints_statement(storage_name, constraint_name)

          execute(destroy_constraints_statement)
        end