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) { $users->load('posts')...
load()gives you the option of deciding later, based on some dynamic condition, whether or not you need to run the 2nd query. If, however, there’s no question that you’ll need to access all the related items, usewith(). 接下来我就要尝试着去使用with和load:不得不说芳哥写的代码还是叼...
When to useload()orwith()? load()gives you the option of deciding later, based on some dynamic condition, whether or not you need to run the 2nd query. If, however, there’s no question that you’ll need to access all the related items, usewith(). 先说说 关联查询:我们在 Model 类...
if (array_key_exists($key, $this->relations)) { return $this->relations[$key]; } // If the "attribute" exists as a method on the model, we will just assume // it is a relationship and will load and return results from the query // and hydrate the relationship's value on the ...
Laravel - How to Eagerload the relation when filtering with multiple condition Ask Question Asked 1 year, 4 months ago Modified 1 year, 4 months ago Viewed 43 times Report this ad0 i have a problem to eagerload the relation data when filtering the data based oh what the user...
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 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....
Model::handleLazyLoadingViolationUsing(function ($model, $relation) { $class = get_class($model); info("Attempted to lazy load [{$relation}] on model [{$class}]."); });插入& 更新关联模型save 方法Eloquent 提供了向关系中添加新模型的便捷方法。例如,你可能需要向一篇文章(Post 模型)添加一条...
* Get the phone record associated with the user. */publicfunctionphone(){return$this->hasOne('App\Phone');}} 传递到hasOne方法的第一个参数应该是关联模型的名称。一旦关联被定义完成,我们可以使用 Eloquent 的动态属性来访问关联模型的记录。动态属性允许你访问关联函数,就像是它们是定义在模型中的属性一...
$users = App\User::with(['posts' => function ($query) { $query->orderBy('created_at', 'desc'); }])->get(); 懒惰渴求式加载 $books = App\Book::all(); if ($someCondition) { $books->load('author', 'publisher'); }