暂存

vendor/illuminate/database/Eloquent/Relations/HasOneThrough.php

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+<?php
+
+namespace Illuminate\Database\Eloquent\Relations;
+
+use Illuminate\Contracts\Database\Eloquent\SupportsPartialRelations;
+use Illuminate\Database\Eloquent\Builder;
+use Illuminate\Database\Eloquent\Collection as EloquentCollection;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\Concerns\CanBeOneOfMany;
+use Illuminate\Database\Eloquent\Relations\Concerns\ComparesRelatedModels;
+use Illuminate\Database\Eloquent\Relations\Concerns\InteractsWithDictionary;
+use Illuminate\Database\Eloquent\Relations\Concerns\SupportsDefaultModels;
+use Illuminate\Database\Query\JoinClause;
+
+/**
+ * @template TRelatedModel of \Illuminate\Database\Eloquent\Model
+ * @template TIntermediateModel of \Illuminate\Database\Eloquent\Model
+ * @template TDeclaringModel of \Illuminate\Database\Eloquent\Model
+ *
+ * @extends \Illuminate\Database\Eloquent\Relations\HasOneOrManyThrough<TRelatedModel, TIntermediateModel, TDeclaringModel, ?TRelatedModel>
+ */
+class HasOneThrough extends HasOneOrManyThrough implements SupportsPartialRelations
+{
+    use ComparesRelatedModels, CanBeOneOfMany, InteractsWithDictionary, SupportsDefaultModels;
+
+    /** @inheritDoc */
+    public function getResults()
+    {
+        if (is_null($this->getParentKey())) {
+            return $this->getDefaultFor($this->farParent);
+        }
+
+        return $this->first() ?: $this->getDefaultFor($this->farParent);
+    }
+
+    /** @inheritDoc */
+    public function initRelation(array $models, $relation)
+    {
+        foreach ($models as $model) {
+            $model->setRelation($relation, $this->getDefaultFor($model));
+        }
+
+        return $models;
+    }
+
+    /** @inheritDoc */
+    public function match(array $models, EloquentCollection $results, $relation)
+    {
+        $dictionary = $this->buildDictionary($results);
+
+        // Once we have the dictionary we can simply spin through the parent models to
+        // link them up with their children using the keyed dictionary to make the
+        // matching very convenient and easy work. Then we'll just return them.
+        foreach ($models as $model) {
+            $key = $this->getDictionaryKey($model->getAttribute($this->localKey));
+
+            if ($key !== null && isset($dictionary[$key])) {
+                $value = $dictionary[$key];
+
+                $model->setRelation(
+                    $relation, reset($value)
+                );
+            }
+        }
+
+        return $models;
+    }
+
+    /** @inheritDoc */
+    public function getRelationExistenceQuery(Builder $query, Builder $parentQuery, $columns = ['*'])
+    {
+        if ($this->isOneOfMany()) {
+            $this->mergeOneOfManyJoinsTo($query);
+        }
+
+        return parent::getRelationExistenceQuery($query, $parentQuery, $columns);
+    }
+
+    /** @inheritDoc */
+    public function addOneOfManySubQueryConstraints(Builder $query, $column = null, $aggregate = null)
+    {
+        $query->addSelect([$this->getQualifiedFirstKeyName()]);
+
+        // We need to join subqueries that aren't the inner-most subquery which is joined in the CanBeOneOfMany::ofMany method...
+        if ($this->getOneOfManySubQuery() !== null) {
+            $this->performJoin($query);
+        }
+    }
+
+    /** @inheritDoc */
+    public function getOneOfManySubQuerySelectColumns()
+    {
+        return [$this->getQualifiedFirstKeyName()];
+    }
+
+    /** @inheritDoc */
+    public function addOneOfManyJoinSubQueryConstraints(JoinClause $join)
+    {
+        $join->on($this->qualifySubSelectColumn($this->firstKey), '=', $this->getQualifiedFirstKeyName());
+    }
+
+    /**
+     * Make a new related instance for the given model.
+     *
+     * @param  TDeclaringModel  $parent
+     * @return TRelatedModel
+     */
+    public function newRelatedInstanceFor(Model $parent)
+    {
+        return $this->related->newInstance();
+    }
+
+    /** @inheritDoc */
+    protected function getRelatedKeyFrom(Model $model)
+    {
+        return $model->getAttribute($this->getForeignKeyName());
+    }
+
+    /** @inheritDoc */
+    public function getParentKey()
+    {
+        return $this->farParent->getAttribute($this->localKey);
+    }
+}