HasRelationships::extractChildRelations() - Code Metrics - Inspection of "Merge docs and chanelog changes" - flugger/laravel-responder - Measure and Improve Code Quality continuously with Scrutinizer

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Push — master ( 7994a9...5d160b )

by Alexander

created 2018-02-06 13:55 UTC

HasRelationships::extractChildRelations() A

↳ Parent: HasRelationships

Complexity

Conditions	2
Paths	1

Size

Total Lines	13
Code Lines	7

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	7
CRAP Score	2

Importance

Changes

Metric	Value
cc	2
eloc	7
nc	1
nop	2
dl	0
loc	13
ccs	7
cts	7
cp	1
crap	2
rs	9.4285
c	0
b	0
f	0

<?php

namespace Flugg\Responder\Transformers\Concerns;

use Illuminate\Database\Eloquent\Model;

/**
 * A trait to be used by a transformer to handle relations
 *
 * @package flugger/laravel-responder
 * @author  Alexander Tømmerås <[email protected]>
 * @license The MIT License
 */
trait HasRelationships
{
    /**
     * List of available relations.
     *
     * @var string[]
     */
    protected $relations = [];

    /**
     * A list of autoloaded default relations.
     *
     * @var array
     */
    protected $load = [];

    /**
     * Get a list of whitelisted relations that are requested, including nested relations.
     *
     * @param  array $requested
     * @return array
     */
    public function relations(array $requested = []): array

    {
        $requested = $this->normalizeRelations($requested);
        $relations = $this->applyQueryConstraints($this->extractRelations($requested));
        $nestedRelations = $this->nestedRelations($requested, $relations, 'relations');

        return array_merge($relations, $nestedRelations);
    }

    /**
     * Get a list of default relations including nested relations.
     *
     * @param  array $requested
     * @return array
     */
    public function defaultRelations(array $requested = []): array

    {
        $requested = $this->normalizeRelations($requested);
        $relations = $this->applyQueryConstraints($this->normalizeRelations($this->load));
        $nestedRelations = $this->nestedRelations($relations, array_merge($relations, $requested), 'defaultRelations');

        return array_merge($relations, $nestedRelations);
    }

    /**
     * Get a list of available relations from the transformer with a normalized structure.
     *
     * @return array
     */
    protected function availableRelations(): array
    {
        return $this->normalizeRelations(array_merge($this->relations, $this->load));
    }

    /**
     * Get nested relations from transformers resolved from the $available parameter that
     * also occur in the $requested parameter.
     *
     * @param  array  $requested
     * @param  array  $available
     * @param  string $method
     * @return array
     */
    protected function nestedRelations(array $requested, array $available, string $method): array
    {
        $transformers = $this->mappedTransformers($available);

        return collect(array_keys($transformers))->reduce(function ($nestedRelations, $relation) use ($requested, $method, $transformers) {
            $transformer = $transformers[$relation];
            $children = $this->extractChildRelations($requested, $relation);
            $childRelations = $this->wrapChildRelations($transformer->$method($children), $relation);

            return array_merge($nestedRelations, $childRelations);
        }, []);
    }

    /**
     * Extract available root relations from the given list of relations.
     *
     * @param  array $relations
     * @return array
     */
    protected function extractRelations(array $relations): array
    {
        $available = $this->availableRelations();

        return array_filter($this->mapRelations($relations, function ($relation, $constraint) {
            $identifier = explode('.', $relation)[0];
            $constraint = $identifier === $relation ? $constraint : null;

            return [$identifier => $constraint ?: $this->resolveQueryConstraint($identifier)];
        }), function ($relation) use ($available) {
            return array_has($available, explode(':', $relation)[0]);
        }, ARRAY_FILTER_USE_KEY);
    }

    /**
     * Extract all nested relations under a given identifier.
     *
     * @param  array  $relations
     * @param  string $identifier
     * @return array
     */
    protected function extractChildRelations(array $relations, string $identifier): array
    {
        return array_reduce(array_keys($relations), function ($nested, $relation) use ($relations, $identifier) {
            if (! starts_with($relation, "$identifier.")) {
                return $nested;
            }

            $nestedIdentifier = explode('.', $relation);
            array_shift($nestedIdentifier);

            return array_merge($nested, [implode('.', $nestedIdentifier) => $relations[$relation]]);
        }, []);
    }

    /**
     * Wrap the identifier of each relation of the given list of nested relations with
     * the parent relation identifier using dot notation.
     *
     * @param  array  $nestedRelations
     * @param  string $relation
     * @return array
     */
    protected function wrapChildRelations(array $nestedRelations, string $relation): array
    {
        return $this->mapRelations($nestedRelations, function ($nestedRelation, $constraint) use ($relation) {
            return ["$relation.$nestedRelation" => $constraint];
        });
    }

    /**
     * Normalize relations to force an [identifier => constraint/transformer] structure.
     *
     * @param  array $relations
     * @return array
     */
    protected function normalizeRelations(array $relations): array
    {
        return array_reduce(array_keys($relations), function ($normalized, $relation) use ($relations) {
            if (is_numeric($relation)) {
                return array_merge($normalized, [$relations[$relation] => null]);
            }

            return array_merge($normalized, [$relation => $relations[$relation]]);
        }, []);
    }

    /**
     * Map over a list of relations with the [identifier => constraint/transformer] structure.
     *
     * @param  array    $relations
     * @param  callable $callback
     * @return array
     */
    protected function mapRelations(array $relations, callable $callback): array
    {
        $mapped = [];

        foreach ($relations as $identifier => $value) {
            $mapped = array_merge($mapped, $callback($identifier, $value));
        }

        return $mapped;
    }

    /**
     * Applies any query constraints defined in the transformer to the list of relaations.
     *
     * @param  array $relations
     * @return array
     */
    protected function applyQueryConstraints(array $relations): array
    {
        return $this->mapRelations($relations, function ($relation, $constraint) {
            return [$relation => is_callable($constraint) ? $constraint : $this->resolveQueryConstraint($relation)];
        });
    }

    /**
     * Resolve a query constraint for a given relation identifier.
     *
     * @param  string $identifier
     * @return \Closure|null
     */
    protected function resolveQueryConstraint(string $identifier)
    {
        if (! method_exists($this, $method = 'load' . ucfirst(camel_case($identifier)))) {
            return null;
        }

        return function ($query) use ($method) {
            return $this->$method($query);
        };
    }

    /**
     * Resolve a relation from a model instance and an identifier.
     *
     * @param  \Illuminate\Database\Eloquent\Model $model
     * @param  string                              $identifier
     * @return mixed
     */
    protected function resolveRelation(Model $model, string $identifier)
    {
        $identifier = camel_case($identifier);
        $relation = $model->$identifier;

        if (method_exists($this, $method = 'filter' . ucfirst($identifier))) {
            return $this->$method($relation);
        }

        return $relation;
    }

    /**
     * Resolve a list of transformers from a list of relations mapped to transformers.
     *
     * @param  array $relations
     * @return array
     */
    protected function mappedTransformers(array $relations): array
    {
        return collect($this->availableRelations())->filter(function ($transformer) {
            return ! is_null($transformer);
        })->map(function ($transformer) {
            return $this->resolveTransformer($transformer);
        })->intersectKey($relations)->all();
    }

    /**
     * Get a related transformer class mapped to a relation identifier.
     *
     * @param  string $identifier
     * @return string|null
     */
    protected function mappedTransformerClass(string $identifier)
    {
        return $this->availableRelations()[$identifier] ?? null;
    }

    /**
     * Resolve a transformer from a class name string.
     *
     * @param  string $transformer
     * @return mixed
     */
    protected abstract function resolveTransformer(string $transformer);
}

1			<?php
2
3			namespace Flugg\Responder\Transformers\Concerns;
4
5			use Illuminate\Database\Eloquent\Model;
6
7			/**
8			* A trait to be used by a transformer to handle relations
9			*
10			* @package flugger/laravel-responder
11			* @author Alexander Tømmerås <[email protected]>
12			* @license The MIT License
13			*/
14			trait HasRelationships
15			{
16			/**
17			* List of available relations.
18			*
19			* @var string[]
20			*/
21			protected $relations = [];
22
23			/**
24			* A list of autoloaded default relations.
25			*
26			* @var array
27			*/
28			protected $load = [];
29
30			/**
31			* Get a list of whitelisted relations that are requested, including nested relations.
32			*
33			* @param array $requested
34			* @return array
35			*/
36	41	View Code Duplication	public function relations(array $requested = []): array
			0 ignored issues – show Duplication introduced 2018-02-06 14:02 UTC by Report Bug Copy Issue Report This method seems to be duplicated in 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...
37			{
38	41		$requested = $this->normalizeRelations($requested);
39	41		$relations = $this->applyQueryConstraints($this->extractRelations($requested));
40	41		$nestedRelations = $this->nestedRelations($requested, $relations, 'relations');
41
42	41		return array_merge($relations, $nestedRelations);
43			}
44
45			/**
46			* Get a list of default relations including nested relations.
47			*
48			* @param array $requested
49			* @return array
50			*/
51	41	View Code Duplication	public function defaultRelations(array $requested = []): array
			0 ignored issues – show Duplication introduced 2018-02-06 14:02 UTC by Report Bug Copy Issue Report This method seems to be duplicated in 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...
52			{
53	41		$requested = $this->normalizeRelations($requested);
54	41		$relations = $this->applyQueryConstraints($this->normalizeRelations($this->load));
55	41		$nestedRelations = $this->nestedRelations($relations, array_merge($relations, $requested), 'defaultRelations');
56
57	41		return array_merge($relations, $nestedRelations);
58			}
59
60			/**
61			* Get a list of available relations from the transformer with a normalized structure.
62			*
63			* @return array
64			*/
65	44		protected function availableRelations(): array
66			{
67	44		return $this->normalizeRelations(array_merge($this->relations, $this->load));
68			}
69
70			/**
71			* Get nested relations from transformers resolved from the $available parameter that
72			* also occur in the $requested parameter.
73			*
74			* @param array $requested
75			* @param array $available
76			* @param string $method
77			* @return array
78			*/
79	41		protected function nestedRelations(array $requested, array $available, string $method): array
80			{
81	41		$transformers = $this->mappedTransformers($available);
82
83	41		return collect(array_keys($transformers))->reduce(function ($nestedRelations, $relation) use ($requested, $method, $transformers) {
84	12		$transformer = $transformers[$relation];
85	12		$children = $this->extractChildRelations($requested, $relation);
86	12		$childRelations = $this->wrapChildRelations($transformer->$method($children), $relation);
87
88	12		return array_merge($nestedRelations, $childRelations);
89	41		}, []);
90			}
91
92			/**
93			* Extract available root relations from the given list of relations.
94			*
95			* @param array $relations
96			* @return array
97			*/
98	41		protected function extractRelations(array $relations): array
99			{
100	41		$available = $this->availableRelations();
101
102	18		return array_filter($this->mapRelations($relations, function ($relation, $constraint) {
103	18		$identifier = explode('.', $relation)[0];
104	18		$constraint = $identifier === $relation ? $constraint : null;
105
106	18		return [$identifier => $constraint ?: $this->resolveQueryConstraint($identifier)];
107			}), function ($relation) use ($available) {
108	18		return array_has($available, explode(':', $relation)[0]);
109	41		}, ARRAY_FILTER_USE_KEY);
110			}
111
112			/**
113			* Extract all nested relations under a given identifier.
114			*
115			* @param array $relations
116			* @param string $identifier
117			* @return array
118			*/
119			protected function extractChildRelations(array $relations, string $identifier): array
120			{
121	12		return array_reduce(array_keys($relations), function ($nested, $relation) use ($relations, $identifier) {
122	12		if (! starts_with($relation, "$identifier.")) {
123	12		return $nested;
124			}
125
126	6		$nestedIdentifier = explode('.', $relation);
127	6		array_shift($nestedIdentifier);
128
129	6		return array_merge($nested, [implode('.', $nestedIdentifier) => $relations[$relation]]);
130	12		}, []);
131			}
132
133			/**
134			* Wrap the identifier of each relation of the given list of nested relations with
135			* the parent relation identifier using dot notation.
136			*
137			* @param array $nestedRelations
138			* @param string $relation
139			* @return array
140			*/
141			protected function wrapChildRelations(array $nestedRelations, string $relation): array
142			{
143	12		return $this->mapRelations($nestedRelations, function ($nestedRelation, $constraint) use ($relation) {
144	9		return ["$relation.$nestedRelation" => $constraint];
145	12		});
146			}
147
148			/**
149			* Normalize relations to force an [identifier => constraint/transformer] structure.
150			*
151			* @param array $relations
152			* @return array
153			*/
154			protected function normalizeRelations(array $relations): array
155			{
156	47		return array_reduce(array_keys($relations), function ($normalized, $relation) use ($relations) {
157	26		if (is_numeric($relation)) {
158	16		return array_merge($normalized, [$relations[$relation] => null]);
159			}
160
161	22		return array_merge($normalized, [$relation => $relations[$relation]]);
162	47		}, []);
163			}
164
165			/**
166			* Map over a list of relations with the [identifier => constraint/transformer] structure.
167			*
168			* @param array $relations
169			* @param callable $callback
170			* @return array
171			*/
172	41		protected function mapRelations(array $relations, callable $callback): array
173			{
174	41		$mapped = [];
175
176	41		foreach ($relations as $identifier => $value) {
177	20		$mapped = array_merge($mapped, $callback($identifier, $value));
178			}
179
180	41		return $mapped;
181			}
182
183			/**
184			* Applies any query constraints defined in the transformer to the list of relaations.
185			*
186			* @param array $relations
187			* @return array
188			*/
189			protected function applyQueryConstraints(array $relations): array
190			{
191	41		return $this->mapRelations($relations, function ($relation, $constraint) {
192	19		return [$relation => is_callable($constraint) ? $constraint : $this->resolveQueryConstraint($relation)];
193	41		});
194			}
195
196			/**
197			* Resolve a query constraint for a given relation identifier.
198			*
199			* @param string $identifier
200			* @return \Closure\|null
201			*/
202	19		protected function resolveQueryConstraint(string $identifier)
203			{
204	19		if (! method_exists($this, $method = 'load' . ucfirst(camel_case($identifier)))) {
205	18		return null;
206			}
207
208	1		return function ($query) use ($method) {
209	1		return $this->$method($query);
210	1		};
211			}
212
213			/**
214			* Resolve a relation from a model instance and an identifier.
215			*
216			* @param \Illuminate\Database\Eloquent\Model $model
217			* @param string $identifier
218			* @return mixed
219			*/
220	18		protected function resolveRelation(Model $model, string $identifier)
221			{
222	18		$identifier = camel_case($identifier);
223	18		$relation = $model->$identifier;
224
225	18		if (method_exists($this, $method = 'filter' . ucfirst($identifier))) {
226	1		return $this->$method($relation);
227			}
228
229	17		return $relation;
230			}
231
232			/**
233			* Resolve a list of transformers from a list of relations mapped to transformers.
234			*
235			* @param array $relations
236			* @return array
237			*/
238			protected function mappedTransformers(array $relations): array
239			{
240	19		return collect($this->availableRelations())->filter(function ($transformer) {
241	19		return ! is_null($transformer);
242			})->map(function ($transformer) {
243	12		return $this->resolveTransformer($transformer);
244	41		})->intersectKey($relations)->all();
245			}
246
247			/**
248			* Get a related transformer class mapped to a relation identifier.
249			*
250			* @param string $identifier
251			* @return string\|null
252			*/
253	22		protected function mappedTransformerClass(string $identifier)
254			{
255	22		return $this->availableRelations()[$identifier] ?? null;
256			}
257
258			/**
259			* Resolve a transformer from a class name string.
260			*
261			* @param string $transformer
262			* @return mixed
263			*/
264			protected abstract function resolveTransformer(string $transformer);
265			}

flugger / laravel-responder

Push — master ( 7994a9...5d160b )

HasRelationships::extractChildRelations() A

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