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<?php |
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namespace MaksimM\CompositePrimaryKeys\Eloquent\Relationships; |
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use Illuminate\Database\Eloquent\Collection; |
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use Illuminate\Database\Eloquent\Relations\BelongsTo; |
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use MaksimM\CompositePrimaryKeys\Exceptions\WrongRelationConfigurationException; |
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use MaksimM\CompositePrimaryKeys\Scopes\CompositeKeyScope; |
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class CompositeBelongsTo extends BelongsTo |
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{ |
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protected $magicKeyDelimiter = '___'; |
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/** |
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* Set the base constraints on the relation query. |
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* |
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* @throws WrongRelationConfigurationException |
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* |
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* @return void |
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*/ |
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public function addConstraints() |
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{ |
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if (static::$constraints) { |
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// For belongs to relationships, which are essentially the inverse of has one |
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// or has many relationships, we need to actually query on the primary key |
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// of the related models matching on the foreign key that's on a parent. |
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$table = $this->related->getTable(); |
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$ownerKeys = $this->getOwnerKeys(); |
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$foreignKeys = $this->getForeignKeys(); |
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if (count($ownerKeys) != count($foreignKeys)) { |
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throw new WrongRelationConfigurationException(); |
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} |
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foreach ($ownerKeys as $keyIndex => $key) { |
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$this->query->where($table.'.'.$key, '=', $this->child->{$foreignKeys[$keyIndex]}); |
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} |
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} |
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} |
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/** |
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* Get the results of the relationship. |
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* |
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* @return mixed |
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*/ |
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public function getResults() |
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{ |
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$foreignKey = !is_array($this->foreignKey) ? [$this->foreignKey] : $this->foreignKey; |
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foreach ($foreignKey as $foreignKeyVal) { |
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if (is_null($this->child->{$foreignKeyVal})) { |
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return $this->getDefaultFor($this->parent); |
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} |
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} |
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return $this->query->first() ?: $this->getDefaultFor($this->parent); |
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} |
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/** |
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* Set the constraints for an eager load of the relation. |
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* |
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* @param array $models |
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* |
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* @return void |
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*/ |
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public function addEagerConstraints(array $models) |
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{ |
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$ownerKeys = $this->getOwnerKeys(); |
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// We'll grab the primary key name of the related models since it could be set to |
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// a non-standard name and not "id". We will then construct the constraint for |
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// our eagerly loading query so it returns the proper models from execution. |
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(new CompositeKeyScope(array_map(function ($keyName) { |
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return $this->related->getTable().'.'.$keyName; |
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}, $ownerKeys), $this->getEagerModelKeys($models), false, method_exists($this->related, 'getBinaryColumns') ? $this->related->getBinaryColumns() : []))->apply($this->query); |
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} |
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public function getOwnerKeys() |
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{ |
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if (method_exists($this->parent, 'hasCompositeIndex') && $this->parent->hasCompositeIndex() && !is_array($this->ownerKey) && strpos($this->ownerKey, $this->magicKeyDelimiter) !== false) { |
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$this->ownerKey = explode($this->magicKeyDelimiter, $this->ownerKey); |
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} |
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return !is_array($this->ownerKey) ? [$this->ownerKey] : $this->ownerKey; |
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} |
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public function getForeignKeys() |
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{ |
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if (method_exists($this->related, 'hasCompositeIndex') && $this->related->hasCompositeIndex() && !is_array($this->foreignKey) && strpos($this->foreignKey, $this->magicKeyDelimiter) !== false) { |
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$this->foreignKey = explode($this->magicKeyDelimiter, $this->foreignKey); |
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} |
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return !is_array($this->foreignKey) ? [$this->foreignKey] : $this->foreignKey; |
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} |
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/** |
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* Gather the keys from an array of related models. |
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* |
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* @param array $models |
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* |
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* @return array |
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*/ |
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protected function getEagerModelKeys(array $models) |
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{ |
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$keys = []; |
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$ownerKeys = $this->getOwnerKeys(); |
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$foreignKeys = $this->getForeignKeys(); |
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// First we need to gather all of the keys from the parent models so we know what |
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// to query for via the eager loading query. We will add them to an array then |
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// execute a "where in" statement to gather up all of those related records. |
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foreach ($models as $model) { |
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$compositeKey = []; |
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foreach ($foreignKeys as $index => $foreignKey) { |
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if (!is_null($value = $model->{$foreignKey})) { |
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$compositeKey[$this->related->getTable().'.'.$ownerKeys[$index]] = $value; |
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} |
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} |
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$keys[] = $compositeKey; |
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} |
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if (count($foreignKeys) == 1) { |
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sort($keys); |
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return array_values(array_unique($keys)); |
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} else { |
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return $keys; |
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} |
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} |
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/** |
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* Match the eagerly loaded results to their parents. |
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* |
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* @param array $models |
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* @param Collection $results |
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* @param string $relation |
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* |
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* @return array |
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*/ |
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public function match(array $models, Collection $results, $relation) |
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{ |
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$foreignKeys = $this->getForeignKeys(); |
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$ownerKeys = $this->getOwnerKeys(); |
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// First we will get to build a dictionary of the child models by their primary |
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// key of the relationship, then we can easily match the children back onto |
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// the parents using that dictionary and the primary key of the children. |
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$dictionary = []; |
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foreach ($results as $result) { |
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$dictionary[implode($this->magicKeyDelimiter, array_map(function ($owner) use ($result) { |
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return $result->getAttribute($owner); |
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}, $ownerKeys))] = $result; |
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} |
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// Once we have the dictionary constructed, we can loop through all the parents |
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// and match back onto their children using these keys of the dictionary and |
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// the primary key of the children to map them onto the correct instances. |
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foreach ($models as $model) { |
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$foreignKey = implode($this->magicKeyDelimiter, array_map(function ($foreign) use ($model) { |
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return $model->{$foreign}; |
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}, $foreignKeys)); |
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if (isset($dictionary[$foreignKey])) { |
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$model->setRelation($relation, $dictionary[$foreignKey]); |
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} |
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} |
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return $models; |
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} |
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} |
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maksimru /
composite-primary-keys
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