the same two queries. The key difference is that with() eager loads the related model up front, immediately after the initial query (all(), first(), or find(x), for example); when using load(), you run the initial query first, and then eager load the relation at some later point....
The key difference is that with() eager loads the related model up front, immediately after the initial query (all(), first(), or find(x), for example); when using load(), you run the initial query first, and then eager load the relation at some later point....
When to useload()orwith()? load()gives you the option of deciding later, based on some dynamic condition, whether or not you need to run the 2nd query. If, however, there’s no question that you’ll need to access all the related items, usewith(). 先说说 关联查询:我们在 Model 类...
有时候,你可能觉得一次性加载所有关联数据有点浪费,对于特定条件下才使用的数据我们可以通过动态条件判断进行渴求式加载或者延迟加载。我们将这种加载叫做懒惰渴求式加载,这种加载可以通过 load 方法实现:Copy Highlighter-hljs$users = User::all(); $condition = true; if ($condition) { $users->load('posts')...
the same two queries. The key difference is that with() eager loads the related model up front, immediately after the initial query (all(), first(), or find(x), for example); when using load(), you run the initial query first, and then eager load the relation at some later point....
有时候,你可能觉得一次性加载所有关联数据有点浪费,对于特定条件下才使用的数据我们可以通过动态条件判断进行渴求式加载或者延迟加载。我们将这种加载叫做懒惰渴求式加载,这种加载可以通过 load 方法实现: 代码语言:javascript 复制 $users = User::all(); $condition = true; if ($condition) { $users->load('pos...
如果你想要你的 pivot 表自动包含created_at 和updated_at 时间戳,在关联关系定义时使用 withTimestamps 方法:return $this->belongsToMany('App\Role')->withTimestamps(); 自定义 pivot 属性名上面已经提到,我们可以通过在模型上使用 pivot 属性来访问中间表字段,此外,我们还可以在应用中自定义这个属性名称来...
use Illuminate\Database\Eloquent\Relations\Relation; Relation::morphMap([ 'posts' => 'App\Post', 'videos' => 'App\Video', ]);可以在 AppServiceProvider 的boot 函数中注册 morphMap,或者创建一个单独的服务提供者。查询关联由于Eloquent 关联的所有类型都通过方法定义,你可以调用这些方法,而无需真实...
Add a relationship count / exists condition to the query with where clauses and an "or". from QueriesRelationships Builder|QueriesRelationships hasMorph(MorphTo|string $relation, string|array $types, string $operator = '>=', int $count = 1, string $boolean = 'and', Closure|null $callbac...
Once you have completed the changes above, you can run the composer update function to update your core application files! If you receive class load errors, try running the update command with the --no-scripts option enabled like so: composer update --no-scripts....