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.\"
.IX Title "GraphQL::Plugin::Type 3pm"
.TH GraphQL::Plugin::Type 3pm "2022-03-27" "perl v5.34.0" "User Contributed Perl Documentation"
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.SH "NAME"
GraphQL::Plugin::Type \- GraphQL plugins implementing types
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 12
\&  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 => \*(AqDateTime\*(Aq,
\&      serialize => sub { return if !defined $_[0]; $_[0].\*(Aq\*(Aq },
\&      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(<<\*(AqEOF\*(Aq);
\&  type Query { dateTimeNow: DateTime }
\&  EOF
\&  post \*(Aq/graphql\*(Aq => sub {
\&    send_as JSON => execute(
\&      $schema,
\&      body_parameters\->{query},
\&      { dateTimeNow => sub { DateTime\->now } },
\&      undef,
\&      body_parameters\->{variables},
\&      body_parameters\->{operationName},
\&      undef,
\&    );
\&  };
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
Class implementing the scheme by which additional GraphQL type classes
can be implemented.
.PP
The author considers this is only worth doing for scalars, and
indeed this scheme is (now) how the non-standard \f(CW\*(C`DateTime\*(C'\fR is
implemented in graphql-perl. If one wants to create other types
(GraphQL::Type::Object, GraphQL::Type::InputObject, etc), then
the Schema Definition Language is already
available. However, any type can be registered with the \*(L"register\*(R"
method, and will be automatically available to GraphQL::Schema
objects with no additional code.
.SH "METHODS"
.IX Header "METHODS"
.SS "register($graphql_type)"
.IX Subsection "register($graphql_type)"
When called with a GraphQL::Type subclass, will register it,
otherwise dies.
.SS "registered"
.IX Subsection "registered"
Returns a list of registered classes.