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 ...
The first argument passed to the hasOne method is the name of the related model. Once the relationship is defined, we may retrieve it using Eloquent's dynamic properties:1$phone = User::find(1)->phone;The SQL performed by this statement will be as follows:...
You may use "dot" notation to execute a query against a nested relationship. For example, the following query will retrieve all posts that do not have comments; however, posts that have comments from authors that are not banned will be included in the results:use Illuminate\Database\Eloquent...
The first argument passed to the hasOne method is the name of the related model. Once the relationship is defined, we may retrieve it using Eloquent's dynamic properties:1$phone = User::find(1)->phone;The SQL performed by this statement will be as follows:...
Laravel查询orderBy嵌套关系仅使用with()方法不能按嵌套关系排序，需要先连接关系，因此代码应为：
$Paths= Path::with(['ProgrammingField','pathtags' => function ($q) {$q->with(['Tasks' => function ($q) {$q->has('tasktags', '=', 2)->orderBy('id', 'ASC') ->whereDoesntHave('tasktags', function ($query) { $query->whereNotIn('name', ['XML','PHP','CSS3']); } )...
where the roles are also shared by other users. For example, many users may have the role of "Admin". Three database tables are needed for this relationship:users,roles, androle_user. Therole_usertable is derived from the alphabetical order of the related model names, and should haveuser...
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. In this case, it will be assumed that the User model has a relationship...
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 custo...
As we mentioned previously, to determine the table name of the relationship's joining table, Eloquent joins the two related model names in alphabetical order. However, you can override this convention. You can do so by passing a second argument to the belongsToMany method: ...