ResolveValidator::isValidValueForField() - Code Metrics - Inspection of "new logic to variables" - Youshido/GraphQL - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 9459ba...5c21ca )

by Portey

created 2016-10-05 10:04 UTC

ResolveValidator::isValidValueForField() B

↳ Parent: ResolveValidator

Complexity

Conditions	5
Paths	3

Size

Total Lines	19
Code Lines	11

Duplication

Lines	7
Ratio	36.84 %

Code Coverage

Tests	10
CRAP Score	5

Importance

Changes	3
Bugs	0	Features	0

Metric	Value
c	3
b	0
f	0
dl	7
loc	19
ccs	10
cts	10
cp	1
rs	8.8571
cc	5
eloc	11
nc	3
nop	2
crap	5

<?php
/**
 * Date: 01.12.15
 *
 * @author Portey Vasil <[email protected]>
 */

namespace Youshido\GraphQL\Validator\ResolveValidator;

use Youshido\GraphQL\Execution\Context\ExecutionContextInterface;
use Youshido\GraphQL\Execution\Request;
use Youshido\GraphQL\Field\FieldInterface;
use Youshido\GraphQL\Field\InputField;
use Youshido\GraphQL\Parser\Ast\Argument;
use Youshido\GraphQL\Parser\Ast\ArgumentValue\InputList;
use Youshido\GraphQL\Parser\Ast\ArgumentValue\InputObject;
use Youshido\GraphQL\Parser\Ast\ArgumentValue\Literal;
use Youshido\GraphQL\Parser\Ast\ArgumentValue\Variable;
use Youshido\GraphQL\Parser\Ast\Field as AstField;
use Youshido\GraphQL\Parser\Ast\Fragment;
use Youshido\GraphQL\Parser\Ast\FragmentReference;
use Youshido\GraphQL\Parser\Ast\Mutation;
use Youshido\GraphQL\Parser\Ast\Query;
use Youshido\GraphQL\Type\AbstractType;
use Youshido\GraphQL\Type\InputObject\AbstractInputObjectType;
use Youshido\GraphQL\Type\InterfaceType\AbstractInterfaceType;
use Youshido\GraphQL\Type\ListType\AbstractListType;
use Youshido\GraphQL\Type\Object\AbstractObjectType;
use Youshido\GraphQL\Type\TypeInterface;
use Youshido\GraphQL\Type\TypeMap;
use Youshido\GraphQL\Type\TypeService;
use Youshido\GraphQL\Type\Union\AbstractUnionType;
use Youshido\GraphQL\Validator\Exception\ResolveException;

class ResolveValidator implements ResolveValidatorInterface
{

    /** @var  ExecutionContextInterface */
    protected $executionContext;

    public function __construct(ExecutionContextInterface $executionContext)
    {
        $this->executionContext = $executionContext;
    }

    /**
     * @param AbstractObjectType      $objectType
     * @param Mutation|Query|AstField $field
     *
     * @return null
     */
    public function objectHasField($objectType, $field)
    {
        if (!(($objectType instanceof AbstractObjectType || $objectType instanceof AbstractInputObjectType)) || !$objectType->hasField($field->getName())) {
            $this->executionContext->addError(new ResolveException(sprintf('Field "%s" not found in type "%s"', $field->getName(), $objectType->getNamedType()->getName())));

            return false;
        }

        return true;
    }

    /**
     * @inheritdoc
     */
    public function validateArguments(FieldInterface $field, $query, Request $request)
    {
        $requiredArguments = array_filter($field->getArguments(), function (InputField $argument) {
            return $argument->getType()->getKind() == TypeMap::KIND_NON_NULL;
        });

        $withDefaultArguments = array_filter($field->getArguments(), function (InputField $argument) {
            return $argument->getConfig()->get('default') !== null;
        });

        foreach ($query->getArguments() as $argument) {
            if (!$field->hasArgument($argument->getName())) {

                $this->executionContext->addError(new ResolveException(sprintf('Unknown argument "%s" on field "%s"', $argument->getName(), $field->getName())));

                return false;
            }

            $originalArgumentType = $field->getArgument($argument->getName())->getType();
            $argumentType         = $originalArgumentType->getNullableType()->getNamedType();

            if ($argument->getValue() instanceof Variable) {
                if (!$this->processVariable($argument, $argumentType, $field, $request)) {
                    return false;
                }
            } elseif ($argumentType->getKind() == TypeMap::KIND_INPUT_OBJECT) {
                if ($originalArgumentType->getNullableType()->getKind() == TypeMap::KIND_LIST) {
                    if (!$argument->getValue() instanceof InputList) {
                        return false;
                    }

                    foreach ($argument->getValue()->getValue() as $item) {
                        if(!$this->processInputObject($item, $argumentType, $request)) {

                            return false;
                        }
                    }
                } else if (!$this->processInputObject($argument->getValue(), $argumentType, $request)) {

                    return false;
                }
            }

            $values = $argument->getValue()->getValue();
            if (!$originalArgumentType instanceof AbstractListType) {
                $values = [$values];
            }
            foreach ($values as $value) {
                if (!$argumentType->isValidValue($value)) {
                    $this->executionContext->addError(new ResolveException(sprintf('Not valid type for argument "%s" in query "%s"', $argument->getName(), $field->getName())));

                    return false;
                }
            }

            if (array_key_exists($argument->getName(), $requiredArguments)) {
                unset($requiredArguments[$argument->getName()]);
            }
            if (array_key_exists($argument->getName(), $withDefaultArguments)) {
                unset($withDefaultArguments[$argument->getName()]);
            }
        }

        if (count($requiredArguments)) {
            $this->executionContext->addError(new ResolveException(sprintf('Require "%s" arguments to query "%s"', implode(', ', array_keys($requiredArguments)), $query->getName())));

            return false;
        }

        if (count($withDefaultArguments)) {
            foreach ($withDefaultArguments as $name => $argument) {
                $query->addArgument(new Argument($name, new Literal($argument->getConfig()->get('default'))));
            }
        }

        return true;
    }

    private function processInputObject(InputObject $astObject, AbstractInputObjectType $inputObjectType, $request)
    {
        foreach ($astObject->getValue() as $name => $value) {
            $field = $inputObjectType->getField($name);

            if (!$field) {
                return false;
            }

            $argumentType = $field->getType()->getNullableType();

            if ($value instanceof Variable && !$this->processVariable(new Argument($name, $value), $argumentType, $field, $request)) {
                return false;
            }
        }

        return true;
    }

    private function processVariable(Argument $argument, TypeInterface $argumentType, FieldInterface $field, Request $request)
    {
        /** @var Variable $variable */
        $variable = $argument->getValue();

        //todo: here validate argument

        if ($variable->getTypeName() !== $argumentType->getName()) {
            $this->executionContext->addError(new ResolveException(sprintf('Invalid variable "%s" type, allowed type is "%s"', $variable->getName(), $argumentType->getName())));

            return false;
        }

        /** @var Variable $requestVariable */
        $requestVariable = $request->getVariable($variable->getName());
        if (null === $requestVariable) {

            $this->executionContext->addError(new ResolveException(sprintf('Variable "%s" does not exist for query "%s"', $argument->getName(), $field->getName())));

            return false;
        }

        $variable->setValue($requestVariable);

        return true;
    }

    public function assertTypeImplementsInterface(AbstractType $type, AbstractInterfaceType $interface)
    {
        if (!$interface->isValidValue($type)) {
            throw new ResolveException('Type ' . $type->getName() . ' does not implement ' . $interface->getName());
        }
    }

    public function assertTypeInUnionTypes(AbstractType $type, AbstractUnionType $unionType)
    {
        $unionTypes = $unionType->getTypes();
        $valid      = false;
        if (empty($unionTypes)) return false;

        foreach ($unionTypes as $unionType) {
            if ($unionType->getName() == $type->getName()) {
                $valid = true;

                break;
            }
        }

        if (!$valid) {
            throw new ResolveException('Type ' . $type->getName() . ' not exist in types of ' . $unionType->getName());
        }
    }

    /**
     * @param Fragment          $fragment
     * @param FragmentReference $fragmentReference
     * @param AbstractType      $queryType
     *
     * @throws \Exception
     */
    public function assertValidFragmentForField($fragment, FragmentReference $fragmentReference, AbstractType $queryType)
    {
        $innerType = $queryType;
        while ($innerType->isCompositeType()) {
            $innerType = $innerType->getTypeOf();
        }

        if (!$fragment instanceof Fragment || $fragment->getModel() !== $innerType->getName()) {
            throw new ResolveException(sprintf('Fragment reference "%s" not found on model "%s"', $fragmentReference->getName(), $queryType->getName()));
        }
    }

    public function hasArrayAccess($data)
    {
        return is_array($data) || $data instanceof \Traversable;
    }

    public function isValidValueForField(FieldInterface $field, $value)
    {
        $fieldType = $field->getType();
        if ($fieldType->getKind() == TypeMap::KIND_NON_NULL && is_null($value)) {

            $this->executionContext->addError(new ResolveException(sprintf('Cannot return null for non-nullable field %s', $field->getName())));

            return null;
        } else {
            $fieldType = $this->resolveTypeIfAbstract($fieldType->getNullableType(), $value);
        }

        if (!is_null($value) && !$fieldType->isValidValue($value)) {
            $this->executionContext->addError(new ResolveException(sprintf('Not valid value for %s field %s', $fieldType->getNullableType()->getKind(), $field->getName())));

            return null;
        }

        return true;
    }

    public function resolveTypeIfAbstract(AbstractType $type, $resolvedValue)
    {
        return TypeService::isAbstractType($type) ? $this->resolveAbstractType($type, $resolvedValue) : $type;
    }

    /**
     * @param AbstractType $type
     * @param              $resolvedValue
     *
     * @return AbstractObjectType
     * @throws ResolveException
     */
    public function resolveAbstractType(AbstractType $type, $resolvedValue)
    {
        /** @var AbstractInterfaceType $type */
        $resolvedType = $type->resolveType($resolvedValue);

        if (!$resolvedType) {
            $this->executionContext->addError(new \Exception('Cannot resolve type'));

            return $type;
class Author {
    private $name;

    public function __construct($name) {
        $this->name = $name;
    }

    public function getName() {
        return $this->name;
    }
}

abstract class Post {
    public function getAuthor() {
        return 'Johannes';
    }
}

class BlogPost extends Post {
    public function getAuthor() {
        return new Author('Johannes');
    }
}

class ForumPost extends Post { /* ... */ }

function my_function(Post $post) {
    echo strtoupper($post->getAuthor());
}
        }
        if ($type instanceof AbstractInterfaceType) {
            $this->assertTypeImplementsInterface($resolvedType, $type);
        } else {
            /** @var AbstractUnionType $type */
            $this->assertTypeInUnionTypes($resolvedType, $type);
        }

        return $resolvedType;
    }

    /**
     * @return ExecutionContextInterface
     */
    public function getExecutionContext()
    {
        return $this->executionContext;
    }

    /**
     * @param ExecutionContextInterface $executionContext
     */
    public function setExecutionContext($executionContext)
    {
        $this->executionContext = $executionContext;
    }

}


1			<?php
2			/**
3			* Date: 01.12.15
4			*
5			* @author Portey Vasil <[email protected]>
6			*/
7
8			namespace Youshido\GraphQL\Validator\ResolveValidator;
9
10			use Youshido\GraphQL\Execution\Context\ExecutionContextInterface;
11			use Youshido\GraphQL\Execution\Request;
12			use Youshido\GraphQL\Field\FieldInterface;
13			use Youshido\GraphQL\Field\InputField;
14			use Youshido\GraphQL\Parser\Ast\Argument;
15			use Youshido\GraphQL\Parser\Ast\ArgumentValue\InputList;
16			use Youshido\GraphQL\Parser\Ast\ArgumentValue\InputObject;
17			use Youshido\GraphQL\Parser\Ast\ArgumentValue\Literal;
18			use Youshido\GraphQL\Parser\Ast\ArgumentValue\Variable;
19			use Youshido\GraphQL\Parser\Ast\Field as AstField;
20			use Youshido\GraphQL\Parser\Ast\Fragment;
21			use Youshido\GraphQL\Parser\Ast\FragmentReference;
22			use Youshido\GraphQL\Parser\Ast\Mutation;
23			use Youshido\GraphQL\Parser\Ast\Query;
24			use Youshido\GraphQL\Type\AbstractType;
25			use Youshido\GraphQL\Type\InputObject\AbstractInputObjectType;
26			use Youshido\GraphQL\Type\InterfaceType\AbstractInterfaceType;
27			use Youshido\GraphQL\Type\ListType\AbstractListType;
28			use Youshido\GraphQL\Type\Object\AbstractObjectType;
29			use Youshido\GraphQL\Type\TypeInterface;
30			use Youshido\GraphQL\Type\TypeMap;
31			use Youshido\GraphQL\Type\TypeService;
32			use Youshido\GraphQL\Type\Union\AbstractUnionType;
33			use Youshido\GraphQL\Validator\Exception\ResolveException;
34
35			class ResolveValidator implements ResolveValidatorInterface
36			{
37
38			/** @var ExecutionContextInterface */
39			protected $executionContext;
40
41	37		public function __construct(ExecutionContextInterface $executionContext)
42			{
43	37		$this->executionContext = $executionContext;
44	37		}
45
46			/**
47			* @param AbstractObjectType $objectType
48			* @param Mutation\|Query\|AstField $field
49			*
50			* @return null
51			*/
52	29		public function objectHasField($objectType, $field)
53			{
54	29		if (!(($objectType instanceof AbstractObjectType \|\| $objectType instanceof AbstractInputObjectType)) \|\| !$objectType->hasField($field->getName())) {
55	2		$this->executionContext->addError(new ResolveException(sprintf('Field "%s" not found in type "%s"', $field->getName(), $objectType->getNamedType()->getName())));
56
57	2		return false;
58			}
59
60	29		return true;
61			}
62
63			/**
64			* @inheritdoc
65			*/
66	29		public function validateArguments(FieldInterface $field, $query, Request $request)
67			{
68			$requiredArguments = array_filter($field->getArguments(), function (InputField $argument) {
69	22		return $argument->getType()->getKind() == TypeMap::KIND_NON_NULL;
70	29		});
71
72	29		$withDefaultArguments = array_filter($field->getArguments(), function (InputField $argument) {
73	22		return $argument->getConfig()->get('default') !== null;
74	29		});
75
76	29		foreach ($query->getArguments() as $argument) {
77	18	View Code Duplication	if (!$field->hasArgument($argument->getName())) {
			0 ignored issues – show Duplication introduced 2016-05-21 01:18 UTC by Report Bug Copy Issue Report This code seems to be duplicated across your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
78	2		$this->executionContext->addError(new ResolveException(sprintf('Unknown argument "%s" on field "%s"', $argument->getName(), $field->getName())));
79
80	2		return false;
81			}
82
83	18		$originalArgumentType = $field->getArgument($argument->getName())->getType();
84	18		$argumentType = $originalArgumentType->getNullableType()->getNamedType();
85
86	18		if ($argument->getValue() instanceof Variable) {
87	4		if (!$this->processVariable($argument, $argumentType, $field, $request)) {
88	2		return false;
89			}
90	17		} elseif ($argumentType->getKind() == TypeMap::KIND_INPUT_OBJECT) {
91	2		if ($originalArgumentType->getNullableType()->getKind() == TypeMap::KIND_LIST) {
92	1		if (!$argument->getValue() instanceof InputList) {
93			return false;
94			}
95
96	1		foreach ($argument->getValue()->getValue() as $item) {
97	1		if(!$this->processInputObject($item, $argumentType, $request)) {
			0 ignored issues – show Compatibility introduced 2016-10-05 10:09 UTC by Report Bug Copy Issue Report `$argumentType` of type `object<Youshido\GraphQL\Type\AbstractType>` is not a sub-type of `object<Youshido\GraphQL\...bstractInputObjectType>`. It seems like you assume a child class of the class `Youshido\GraphQL\Type\AbstractType` to be always present. This check looks for parameters that are defined as one type in their type hint or doc comment but seem to be used as a narrower type, i.e an implementation of an interface or a subclass. Consider changing the type of the parameter or doing an instanceof check before assuming your parameter is of the expected type. Loading history...
98			return false;
99			}
100	1		}
101	2		} else if (!$this->processInputObject($argument->getValue(), $argumentType, $request)) {
			0 ignored issues – show Compatibility introduced 2016-10-05 10:09 UTC by Report Bug Copy Issue Report `$argumentType` of type `object<Youshido\GraphQL\Type\AbstractType>` is not a sub-type of `object<Youshido\GraphQL\...bstractInputObjectType>`. It seems like you assume a child class of the class `Youshido\GraphQL\Type\AbstractType` to be always present. This check looks for parameters that are defined as one type in their type hint or doc comment but seem to be used as a narrower type, i.e an implementation of an interface or a subclass. Consider changing the type of the parameter or doing an instanceof check before assuming your parameter is of the expected type. Loading history...
102			return false;
103			}
104	2		}
105
106	17		$values = $argument->getValue()->getValue();
107	17		if (!$originalArgumentType instanceof AbstractListType) {
108	16		$values = [$values];
109	16		}
110	17		foreach ($values as $value) {
111	17		if (!$argumentType->isValidValue($value)) {
112	4		$this->executionContext->addError(new ResolveException(sprintf('Not valid type for argument "%s" in query "%s"', $argument->getName(), $field->getName())));
113
114	4		return false;
115			}
116	17		}
117
118	16		if (array_key_exists($argument->getName(), $requiredArguments)) {
119	4		unset($requiredArguments[$argument->getName()]);
120	4		}
121	16		if (array_key_exists($argument->getName(), $withDefaultArguments)) {
122	6		unset($withDefaultArguments[$argument->getName()]);
123	6		}
124	27		}
125
126	27		if (count($requiredArguments)) {
127	2		$this->executionContext->addError(new ResolveException(sprintf('Require "%s" arguments to query "%s"', implode(', ', array_keys($requiredArguments)), $query->getName())));
128
129	2		return false;
130			}
131
132	26		if (count($withDefaultArguments)) {
133	4		foreach ($withDefaultArguments as $name => $argument) {
134	4		$query->addArgument(new Argument($name, new Literal($argument->getConfig()->get('default'))));
135	4		}
136	4		}
137
138	26		return true;
139			}
140
141	2		private function processInputObject(InputObject $astObject, AbstractInputObjectType $inputObjectType, $request)
142			{
143	2		foreach ($astObject->getValue() as $name => $value) {
144	2		$field = $inputObjectType->getField($name);
145
146	2		if (!$field) {
147			return false;
148			}
149
150	2		$argumentType = $field->getType()->getNullableType();
151
152	2		if ($value instanceof Variable && !$this->processVariable(new Argument($name, $value), $argumentType, $field, $request)) {
153			return false;
154			}
155	2		}
156
157	2		return true;
158			}
159
160	4		private function processVariable(Argument $argument, TypeInterface $argumentType, FieldInterface $field, Request $request)
161			{
162			/** @var Variable $variable */
163	4		$variable = $argument->getValue();
164
165			//todo: here validate argument
166
167	4		if ($variable->getTypeName() !== $argumentType->getName()) {
168	2		$this->executionContext->addError(new ResolveException(sprintf('Invalid variable "%s" type, allowed type is "%s"', $variable->getName(), $argumentType->getName())));
169
170	2		return false;
171			}
172
173			/** @var Variable $requestVariable */
174	3		$requestVariable = $request->getVariable($variable->getName());
175	3	View Code Duplication	if (null === $requestVariable) {
			0 ignored issues – show Duplication introduced 2016-05-21 01:18 UTC by Report Bug Copy Issue Report This code seems to be duplicated across your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
176	1		$this->executionContext->addError(new ResolveException(sprintf('Variable "%s" does not exist for query "%s"', $argument->getName(), $field->getName())));
177
178	1		return false;
179			}
180
181	3		$variable->setValue($requestVariable);
182
183	3		return true;
184			}
185
186	7		public function assertTypeImplementsInterface(AbstractType $type, AbstractInterfaceType $interface)
187			{
188	7		if (!$interface->isValidValue($type)) {
189	1		throw new ResolveException('Type ' . $type->getName() . ' does not implement ' . $interface->getName());
190			}
191	6		}
192
193	3		public function assertTypeInUnionTypes(AbstractType $type, AbstractUnionType $unionType)
194			{
195	3		$unionTypes = $unionType->getTypes();
196	3		$valid = false;
197	3		if (empty($unionTypes)) return false;
198
199	3		foreach ($unionTypes as $unionType) {
200	3		if ($unionType->getName() == $type->getName()) {
201	2		$valid = true;
202
203	2		break;
204			}
205	3		}
206
207	3		if (!$valid) {
208	2		throw new ResolveException('Type ' . $type->getName() . ' not exist in types of ' . $unionType->getName());
209			}
210	2		}
211
212			/**
213			* @param Fragment $fragment
214			* @param FragmentReference $fragmentReference
215			* @param AbstractType $queryType
216			*
217			* @throws \Exception
218			*/
219	5		public function assertValidFragmentForField($fragment, FragmentReference $fragmentReference, AbstractType $queryType)
220			{
221	5		$innerType = $queryType;
222	5		while ($innerType->isCompositeType()) {
223	3		$innerType = $innerType->getTypeOf();
224	3		}
225
226	5		if (!$fragment instanceof Fragment \|\| $fragment->getModel() !== $innerType->getName()) {
227	1		throw new ResolveException(sprintf('Fragment reference "%s" not found on model "%s"', $fragmentReference->getName(), $queryType->getName()));
228			}
229	4		}
230
231	9		public function hasArrayAccess($data)
232			{
233	9		return is_array($data) \|\| $data instanceof \Traversable;
234			}
235
236	25		public function isValidValueForField(FieldInterface $field, $value)
237			{
238	25		$fieldType = $field->getType();
239	25	View Code Duplication	if ($fieldType->getKind() == TypeMap::KIND_NON_NULL && is_null($value)) {
			0 ignored issues – show Duplication introduced 2016-08-20 19:57 UTC by Report Bug Copy Issue Report This code seems to be duplicated across your project. Duplicated code is one of the most pungent code smells. If you need to duplicate the same code in three or more different places, we strongly encourage you to look into extracting the code into a single class or operation. You can also find more detailed suggestions in the “Code” section of your repository. Loading history...
240	2		$this->executionContext->addError(new ResolveException(sprintf('Cannot return null for non-nullable field %s', $field->getName())));
241
242	2		return null;
243			} else {
244	25		$fieldType = $this->resolveTypeIfAbstract($fieldType->getNullableType(), $value);
245			}
246
247	25		if (!is_null($value) && !$fieldType->isValidValue($value)) {
248	2		$this->executionContext->addError(new ResolveException(sprintf('Not valid value for %s field %s', $fieldType->getNullableType()->getKind(), $field->getName())));
249
250	2		return null;
251			}
252
253	25		return true;
254			}
255
256	25		public function resolveTypeIfAbstract(AbstractType $type, $resolvedValue)
257			{
258	25		return TypeService::isAbstractType($type) ? $this->resolveAbstractType($type, $resolvedValue) : $type;
259			}
260
261			/**
262			* @param AbstractType $type
263			* @param $resolvedValue
264			*
265			* @return AbstractObjectType
266			* @throws ResolveException
267			*/
268	6		public function resolveAbstractType(AbstractType $type, $resolvedValue)
269			{
270			/** @var AbstractInterfaceType $type */
271	6		$resolvedType = $type->resolveType($resolvedValue);
272
273	6		if (!$resolvedType) {
274			$this->executionContext->addError(new \Exception('Cannot resolve type'));
275
276			return $type;
			0 ignored issues – show Bug Best Practice introduced 2016-08-20 19:57 UTC by Report Bug Copy Issue Report The return type of `return $type;` (`Youshido\GraphQL\Type\In...e\AbstractInterfaceType`) is incompatible with the return type documented by `Youshido\GraphQL\Validat...or::resolveAbstractType` of type `Youshido\GraphQL\Type\Object\AbstractObjectType`. If you return a value from a function or method, it should be a sub-type of the type that is given by the parent type f.e. an interface, or abstract method. This is more formally defined by the Lizkov substitution principle, and guarantees that classes that depend on the parent type can use any instance of a child type interchangably. This principle also belongs to the SOLID principles for object oriented design. Let’s take a look at an example: class Author { private $name; public function __construct($name) { $this->name = $name; } public function getName() { return $this->name; } } abstract class Post { public function getAuthor() { return 'Johannes'; } } class BlogPost extends Post { public function getAuthor() { return new Author('Johannes'); } } class ForumPost extends Post { /* ... */ } function my_function(Post $post) { echo strtoupper($post->getAuthor()); } Our function `my_function` expects a `Post` object, and outputs the author of the post. The base class `Post` returns a simple string and outputting a simple string will work just fine. However, the child class `BlogPost` which is a sub-type of `Post` instead decided to return an `object`, and is therefore violating the SOLID principles. If a `BlogPost` were passed to `my_function`, PHP would not complain, but ultimately fail when executing the `strtoupper` call in its body. Loading history...
277			}
278	6		if ($type instanceof AbstractInterfaceType) {
279	5		$this->assertTypeImplementsInterface($resolvedType, $type);
280	5		} else {
281			/** @var AbstractUnionType $type */
282	1		$this->assertTypeInUnionTypes($resolvedType, $type);
283			}
284
285	6		return $resolvedType;
286			}
287
288			/**
289			* @return ExecutionContextInterface
290			*/
291	2		public function getExecutionContext()
292			{
293	2		return $this->executionContext;
294			}
295
296			/**
297			* @param ExecutionContextInterface $executionContext
298			*/
299			public function setExecutionContext($executionContext)
300			{
301			$this->executionContext = $executionContext;
302			}
303
304			}
305

Youshido / GraphQL

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ResolveValidator::isValidValueForField() B

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