vendor/illuminate/database/Eloquent/Collection.php

这里只显示每个文件的开头 60 行。登录后可以解锁完整代码。

微信扫码关注公众号，代码整理好后第一时间通知你。

<?php

namespace Illuminate\Database\Eloquent;

use LogicException;
use Illuminate\Support\Arr;
use Illuminate\Support\Str;
use Illuminate\Contracts\Support\Arrayable;
use Illuminate\Contracts\Queue\QueueableEntity;
use Illuminate\Contracts\Queue\QueueableCollection;
use Illuminate\Support\Collection as BaseCollection;

class Collection extends BaseCollection implements QueueableCollection
{
    /**
     * Find a model in the collection by key.
     *
     * @param  mixed  $key
     * @param  mixed  $default
     * @return \Illuminate\Database\Eloquent\Model|static|null
     */
    public function find($key, $default = null)
    {
        if ($key instanceof Model) {
            $key = $key->getKey();
        }

        if ($key instanceof Arrayable) {
            $key = $key->toArray();
        }

        if (is_array($key)) {
            if ($this->isEmpty()) {
                return new static;
            }

            return $this->whereIn($this->first()->getKeyName(), $key);
        }

        return Arr::first($this->items, function ($model) use ($key) {
            return $model->getKey() == $key;
        }, $default);
    }

    /**
     * Load a set of relationships onto the collection.
     *
     * @param  array|string  $relations
     * @return $this
     */
    public function load($relations)
    {
        if ($this->isNotEmpty()) {
            if (is_string($relations)) {
                $relations = func_get_args();
            }

            $query = $this->first()->newQueryWithoutRelationships()->with($relations);

            $this->items = $query->eagerLoadRelations($this->items);