暂存

vendor/illuminate/database/Eloquent/Factories/BelongsToRelationship.php

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+<?php
+
+namespace Illuminate\Database\Eloquent\Factories;
+
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\MorphTo;
+
+class BelongsToRelationship
+{
+    /**
+     * The related factory instance.
+     *
+     * @var \Illuminate\Database\Eloquent\Factories\Factory|\Illuminate\Database\Eloquent\Model
+     */
+    protected $factory;
+
+    /**
+     * The relationship name.
+     *
+     * @var string
+     */
+    protected $relationship;
+
+    /**
+     * The cached, resolved parent instance ID.
+     *
+     * @var mixed
+     */
+    protected $resolved;
+
+    /**
+     * Create a new "belongs to" relationship definition.
+     *
+     * @param  \Illuminate\Database\Eloquent\Factories\Factory|\Illuminate\Database\Eloquent\Model  $factory
+     * @param  string  $relationship
+     */
+    public function __construct($factory, $relationship)
+    {
+        $this->factory = $factory;
+        $this->relationship = $relationship;
+    }
+
+    /**
+     * Get the parent model attributes and resolvers for the given child model.
+     *
+     * @param  \Illuminate\Database\Eloquent\Model  $model
+     * @return array
+     */
+    public function attributesFor(Model $model)
+    {
+        $relationship = $model->{$this->relationship}();
+
+        return $relationship instanceof MorphTo ? [
+            $relationship->getMorphType() => $this->factory instanceof Factory ? $this->factory->newModel()->getMorphClass() : $this->factory->getMorphClass(),
+            $relationship->getForeignKeyName() => $this->resolver($relationship->getOwnerKeyName()),
+        ] : [
+            $relationship->getForeignKeyName() => $this->resolver($relationship->getOwnerKeyName()),
+        ];
+    }
+
+    /**
+     * Get the deferred resolver for this relationship's parent ID.
+     *
+     * @param  string|null  $key
+     * @return \Closure
+     */
+    protected function resolver($key)
+    {
+        return function () use ($key) {
+            if (! $this->resolved) {
+                $instance = $this->factory instanceof Factory
+                    ? ($this->factory->getRandomRecycledModel($this->factory->modelName()) ?? $this->factory->create())
+                    : $this->factory;
+
+                return $this->resolved = $key ? $instance->{$key} : $instance->getKey();
+            }
+
+            return $this->resolved;
+        };
+    }
+
+    /**
+     * Specify the model instances to always use when creating relationships.
+     *
+     * @param  \Illuminate\Support\Collection  $recycle
+     * @return $this
+     */
+    public function recycle($recycle)
+    {
+        if ($this->factory instanceof Factory) {
+            $this->factory = $this->factory->recycle($recycle);
+        }
+
+        return $this;
+    }
+}