I have a many-to-many relationship to establish that is not returning results, although there is relevant data. What am I missing? MySQL Schema: entities - id services - id entity_service - entity_id - service_id Related Models: classEntityextendsEloquentimplementsUserInterface,RemindableInterface...
Many-to-many relationship is belongsToMany on both models: // Task model public function users() { return $this->belongsToMany('User', 'user_tasks'); // assuming user_id and task_id as fk } // User model public function tasks() { return $this->belongsToMany('Task', 'user_tasks...
一对一的关系(one-to-one relationship) 关系数据库中两个表之间的一种关系,该关系中第一个表中的单个行只可以与第二个表中的一个行相关,且第二个表中的一个行也只可以与第一个表中的一个行相关。 假如我们有一张user表和一张passport表是一对一的关系 首先让我们来表达出这样子的关系在我们的User类(用...
详解Laravel设置多态关系模型别名的方式 作为Laravel 的重度使用者肯定都对多态关系不默生,以官方文档为例,文章有标签,视频有标签,那么文章和视频这些模型与标签模型的关系就是 多态多对多(Many To Many (Polymorphic)) 如果我们给 ID 为 1 的文章打上两个标签,数据库标签关系表的的存储结果就是这样子: 代码语言:...
<?php $role = App\Role::find(1); foreach ($role->users as $user) { // } 当然,我们也可以使用其他方法来操作多对多关系,比如attach()、detach()、sync()方法。 如果需要参照 Laravel 的官方文档可以参考以下链接:https://laravel.com/docs/8.x/eloquent-relationships#many-to-many...
https://laravel.com/docs/5.6/eloquent-relationships#many-to-many In addition to customizing the name of the joining table, you may also customize the column names of the keys on the table by passing additional arguments to the belongsToMany method. The third argument is the foreign key name...
// tags means tags() many-to-many relationship with tag } 这里需要说明一下,类似getAttribute都统一使用驼峰法。然后取值的时候就统一使用下划线的方法,比如这里的tag_list就是对应TagList,如果你写成tag_involved,方法就是getTagInvolvedAttribute()。这样写laravel会自动获取这个值。
laravel支持多种模型之间的relation,对应着模型间的one2one, one2many,many2many,hasManyThrough,Polymorphic, many2many polymorphic关系。 心法 1.所有relation都由model class上的方法来定义; 2. relationship和model本身都是以query builder作为基类的,因此对relation的操作也可以使用类似query builder的方法,比如:可以...
参考https://laravel.com/docs/10.x/eloquent-relationships#retrieving-intermediate-table-columns ...
Imagine that each category has many products. I.e. HasMany relationship is established. How can you get all products of $category and every its descendant? Easy!// Get ids of descendants $categories = $category->descendants()->pluck('id'); // Include the id of category itself $...