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< title > Introduction - graphql-php< / title >
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< a class = "" href = ".." > About< / a >
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< a class = "" href = "../getting-started/" > Getting Started< / a >
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< span class = "caption-text" > Type System< / span >
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< a class = "current" href = "./" > Introduction< / a >
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< li class = "toctree-l3" > < a href = "#type-system" > Type System< / a > < / li >
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< li class = "toctree-l3" > < a href = "#type-definition-styles" > Type Definition Styles< / a > < / li >
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< li class = "toctree-l3" > < a href = "#type-registry" > Type Registry< / a > < / li >
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< a class = "" href = "object-types/" > Object Types< / a >
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< a class = "" href = "scalar-types/" > Scalar Types< / a >
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< a class = "" href = "enum-types/" > Enumeration Types< / a >
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< a class = "" href = "lists-and-nonnulls/" > Lists and Non-Null< / a >
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< a class = "" href = "interfaces/" > Interfaces< / a >
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< a class = "" href = "unions/" > Unions< / a >
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< a class = "" href = "input-types/" > Input Types< / a >
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< a class = "" href = "directives/" > Directives< / a >
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< a class = "" href = "schema/" > Schema< / a >
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< a class = "" href = "../executing-queries/" > Executing Queries< / a >
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< h1 id = "type-system" > Type System< / h1 >
< p > To start using GraphQL you are expected to implement a type hierarchy and expose it as < a href = "../type-system/schema/" > Schema< / a > . < / p >
< p > In < strong > graphql-php< / strong > < code > type< / code > is an instance of internal class from
< code > GraphQL\Type\Definition< / code > namespace: < code > ScalarType< / code > , < code > ObjectType< / code > , < code > InterfaceType< / code > ,
< code > UnionType< / code > , < code > InputObjectType< / code > (or one of it's subclasses).< / p >
< p > But most of the types in your schema will be < a href = "../type-system/object-types/" > object types< / a > .< / p >
< h1 id = "type-definition-styles" > Type Definition Styles< / h1 >
< p > Several styles of type definitions are supported depending on your preferences.< / p >
< p > Inline definitions:< / p >
< pre > < code class = "php" > < ?php
namespace MyApp;
use GraphQL\Type\Definition\ObjectType;
use GraphQL\Type\Definition\Type;
$myType = new ObjectType([
'name' => 'MyType',
'fields' => [
'id' => Type::id()
]
]);
< / code > < / pre >
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< p > Class per type:< / p >
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< pre > < code class = "php" > < ?php
namespace MyApp;
use GraphQL\Type\Definition\ObjectType;
use GraphQL\Type\Definition\Type;
class MyType extends ObjectType
{
public function __construct()
{
$config = [
// Note: 'name' is not needed in this form:
// it will be inferred from class name by omitting namespace and dropping " Type" suffix
'fields' => [
'id' => Type::id()
]
];
parent::__construct($config);
}
}
< / code > < / pre >
< p > You can also mix-and-match styles for convenience. For example:< / p >
< pre > < code class = "php" > < ?php
namespace MyApp;
use GraphQL\Type\Definition\ObjectType;
use GraphQL\Type\Definition\Type;
class BlogPostType extends ObjectType
{
public function __construct()
{
$config = [
'fields' => [
'body' => new ObjectType([
'name' => 'BlogPostBody',
'fields' => [
'html' => Type::string(),
'text' => Type::string(),
]
])
]
];
parent::__construct($config);
}
}
< / code > < / pre >
< h1 id = "type-registry" > Type Registry< / h1 >
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< p > Every type must be presented in Schema by single instance (< strong > graphql-php< / strong >
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throws when it discovers several instances with the same < code > name< / code > in schema).< / p >
< p > Therefore if you define your type as separate PHP class you must ensure that only one
instance of that class is added to schema.< / p >
< p > Typical way to do this is to create registry of your types:< / p >
< pre > < code class = "php" > < ?php
namespace MyApp;
class TypeRegistry
{
private $myAType;
private $myBType;
public function myAType()
{
return $this-> myAType ?: ($this-> myAType = new MyAType($this));
}
public function myBType()
{
return $this-> myBType ?: ($this-> myBType = new MyBType($this));
}
}
< / code > < / pre >
< p > And use this registry in type definition:< / p >
< pre > < code class = "php" > < ?php
namespace MyApp;
use GraphQL\Type\Definition\ObjectType;
class MyAType extends ObjectType
{
public function __construct(TypeRegistry $types)
{
parent::__construct([
'fields' => [
'b' => $types-> myBType()
]
]);
}
}
< / code > < / pre >
< p > Obviously you can automate this registry as you wish to reduce boilerplate or even
introduce Dependency Injection Container if your types have other dependencies.< / p >
< p > Alternatively all methods of registry could be static if you prefer - then there is no need
to pass it in constructor - instead just use use < code > TypeRegistry::myAType()< / code > in your type definitions.< / p >
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