Class: GraphQL::Stitching::Composer::ValidateInterfaces

Inherits:
BaseValidator
  • Object
show all
Defined in:
lib/graphql/stitching/composer/validate_interfaces.rb

Instance Method Summary collapse

Instance Method Details

#perform(supergraph, composer) ⇒ Object

For each composed interface, check the interface against each possible type to assure that intersecting fields have compatible types, structures, and nullability. Verifies compatibility of types that inherit interface contracts through merging.



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# File 'lib/graphql/stitching/composer/validate_interfaces.rb', line 9

def perform(supergraph, composer)
  supergraph.schema.types.each do |type_name, interface_type|
    next unless interface_type.kind.interface?

    supergraph.schema.possible_types(interface_type).each do |possible_type|
      interface_type.fields.each do |field_name, interface_field|
        # graphql-ruby will dynamically apply interface fields on a type implementation,
        # so check the delegation map to assure that all materialized fields have resolver locations.
        unless supergraph.locations_by_type_and_field[possible_type.graphql_name][field_name]&.any?
          raise ValidationError, "Type #{possible_type.graphql_name} does not implement a `#{field_name}` field in any location, "\
            "which is required by interface #{interface_type.graphql_name}."
        end

        intersecting_field = possible_type.fields[field_name]
        interface_type_structure = Util.flatten_type_structure(interface_field.type)
        possible_type_structure = Util.flatten_type_structure(intersecting_field.type)

        if possible_type_structure.length != interface_type_structure.length
          raise ValidationError, "Incompatible list structures between field #{possible_type.graphql_name}.#{field_name} of type "\
            "#{intersecting_field.type.to_type_signature} and interface #{interface_type.graphql_name}.#{field_name} of type #{interface_field.type.to_type_signature}."
        end

        interface_type_structure.each_with_index do |interface_struct, index|
          possible_struct = possible_type_structure[index]

          if possible_struct.name != interface_struct.name
            raise ValidationError, "Incompatible named types between field #{possible_type.graphql_name}.#{field_name} of type "\
              "#{intersecting_field.type.to_type_signature} and interface #{interface_type.graphql_name}.#{field_name} of type #{interface_field.type.to_type_signature}."
          end

          if possible_struct.null? && interface_struct.non_null?
            raise ValidationError, "Incompatible nullability between field #{possible_type.graphql_name}.#{field_name} of type "\
              "#{intersecting_field.type.to_type_signature} and interface #{interface_type.graphql_name}.#{field_name} of type #{interface_field.type.to_type_signature}."
          end
        end
      end
    end
  end
end