Module: GraphQL::StaticValidation::VariableDefaultValuesAreCorrectlyTyped

Defined in:
lib/graphql/static_validation/rules/variable_default_values_are_correctly_typed.rb

Instance Method Summary collapse

Instance Method Details

#on_variable_definition(node, parent) ⇒ Object 



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# File 'lib/graphql/static_validation/rules/variable_default_values_are_correctly_typed.rb', line 5

def on_variable_definition(node, parent)
  if !node.default_value.nil?
    value = node.default_value
    if node.type.is_a?(GraphQL::Language::Nodes::NonNullType)
      add_error(GraphQL::StaticValidation::VariableDefaultValuesAreCorrectlyTypedError.new(
        "Non-null variable $#{node.name} can't have a default value",
        nodes: node,
        name: node.name,
        error_type: VariableDefaultValuesAreCorrectlyTypedError::VIOLATIONS[:INVALID_ON_NON_NULL]
      ))
    else
      type = context.schema.type_from_ast(node.type, context: context)
      if type.nil?
        # This is handled by another validator
      else
        validation_result = context.validate_literal(value, type)

        if !validation_result.valid?
          problems = validation_result.problems
          first_problem = problems && problems.first
          if first_problem
            error_message = first_problem["explanation"]
          end

          error_message ||= "Default value for $#{node.name} doesn't match type #{type.to_type_signature}"
          add_error(GraphQL::StaticValidation::VariableDefaultValuesAreCorrectlyTypedError.new(
            error_message,
            nodes: node,
            name: node.name,
            type: type.to_type_signature,
            error_type: VariableDefaultValuesAreCorrectlyTypedError::VIOLATIONS[:INVALID_TYPE],
          ))
        end
      end
    end
  end

  super
end