NAME

SYNOPSIS

  package GraphQL::Plugin::Type::DateTime;
  use Moo;
  extends qw(GraphQL::Plugin::Type);
  my $iso8601 = DateTime::Format::ISO8601->new;
  GraphQL::Plugin::Type->register(
    GraphQL::Type::Scalar->new(
      name => 'DateTime',
      serialize => sub { return if !defined $_[0]; $_[0].'' },
      parse_value => sub { return if !defined $_[0]; $iso8601->parse_datetime(@_); },
    )
  );
  1;

  package main;
  use GraphQL::Schema;
  use GraphQL::Plugin::Type::DateTime;
  use GraphQL::Execution qw(execute);
  my $schema = GraphQL::Schema->from_doc(<<'EOF');
  type Query { dateTimeNow: DateTime }
  EOF
  post '/graphql' => sub {
    send_as JSON => execute(
      $schema,
      body_parameters->{query},
      { dateTimeNow => sub { DateTime->now } },
      undef,
      body_parameters->{variables},
      body_parameters->{operationName},
      undef,
    );
  };

DESCRIPTION

The author considers this is only worth doing for scalars, and indeed this scheme is (now) how the non-standard "DateTime" is implemented in graphql-perl. If one wants to create other types (GraphQL::Type::Object, GraphQL::Type::InputObject, etc), then the Schema Definition Language is already available. However, any type can be registered with the "register" method, and will be automatically available to GraphQL::Schema objects with no additional code.

METHODS