*/ public function user(): BelongsTo { return $this->belongsTo(User::class)->withDefault(function (User $user, Post $post) { $user->name = 'Guest Author'; }); }Querying Belongs To RelationshipsWhen querying for the children of a "belongs to" relationship, you may manually build the...
When working with a many-to-many relationship, the save method accepts an array of additional intermediate table attributes as its second argument:App\User::find(1)->roles()->save($role, ['expires' => $expires]);Updating A Record On A Pivot TableIf you need to update an existing row ...
By eager loading the nested relationship, we reduce the total number of queries from 11 to 3. 7. Do not load belongsTo relationship if you just need its id Imagine you have two tablespostsandauthors. Posts table has a columnauthor_idwhich represents a belongsTo relationship on the authors ...
Sometimes you may wish to eager load a relationship, but also specify a condition for the eager load. Here's an example:1$users = User::with(array('posts' => function($query) 2{ 3 $query->where('title', 'like', '%first%'); 4 5}))->get();...
$books = App\Book::all(); if ($someCondition) { $books->load('author', 'publisher'); }如果你想设置预加载查询的额外条件,则可以传递一个键值为你想要的关联的数组至 load 方法。这个数组的值应是用于接收查询 闭包 实例:$books->load(['author' => function ($query) { $query->orderBy('...
Eager loading provides a significant reduction in SQL queries that must be executed to load a model's relations.Querying Relationship ExistenceWhen accessing the records for a model, you may wish to limit your results based on the existence of a relationship. For example, imagine you want to ...
But remember to eager load "role" relationship, otherwise, you can easily run into anN+1 query problemhere. #Making it Flexible: Permissions Saved in DB In my personal experience, the usual model of building it all together is this:
When using a custom keyed implicit binding as a nested route parameter, Laravel will automatically scope the query to retrieve the nested model by its parent using conventions to guess the relationship name on the parent. However, this behavior was only previously supported by Laravel when a ...
Tip #14 💡: Find Related IDs on a BelongsToMany Relationship Did you know that Laravel ships with the 'allRelatedId()' method to help you fetch all IDs for a belongsToMany relationship? Now you do 🚀 <?php class User extends Model { public function roles() { return $this->belongs...
You can also control the relationship query by defining a closure which can be used while eager loading the relationship records. The static method name format is laratables[RelationName]RelationQuery. /** * Eager load media items of the role for displaying in the datatables. * * @return ca...