在这些关系模型中,最难实现的就是Many-To-Many这种多对多的关系,不过借助Laravel的强大的Eloquent,实现这个功能还是比较顺心的。 1. 创建数据库表 创建articles表 Schema::create('articles',function(Blueprint$table){$table->increments('id');$table->string('title');$table->text('content');$table->tim...
In previous versions of Laravel,Eloquent model eventswere not dispatched when attaching, detaching, or syncing custom intermediate table / "pivot" models of a many-to-many relationship. When usingcustom intermediate table modelsin Laravel 5.8, the applicable model events will now be dispatched. ...
In addition to conditionally including relationship information in your resource responses, you may conditionally include data from the intermediate tables of many-to-many relationships using the whenPivotLoaded method. The whenPivotLoaded method accepts the name of the pivot table as its first argument...
BelongsToMany 关系: 这是一种多对多关系,表示两个模型之间通过一个中间表(pivot table)关联。 例如,一个Post可以有多个Tag,反之亦然。 Laravel Nova 指标(Metrics): Nova 提供了一种直观的方式来创建和管理仪表盘上的指标。 指标可以显示各种统计数据,如总数、平均值、计数等。
Polymorphic Many To Many Relation Table Structure 多态的多对多关联数据库表结构除了一般的多态关联,也可以使用多对多的多态关联。例如,Blog 的Post 和Video 模型可以共用多态的Tag 关联模型。首先,来看看数据库表结构:posts id - integer name - string videos id - integer name - string tags id - integer...
④多对多查询(belongsToMany) 1.导入数据库,创建Keyword模型 2.在Article模型中编写keyword方法 3.编写测试类 4.配置路由: 5.运行结果: 数据库代码↓ #① 创建数据库,并使用USE选择数据库 CREATE DATABASE IF NOT EXISTS `laravel` DEFAULT CHARSET utf8mb4; USE `laravel`; # 作者表 CREATE TABLE `author...
代码语言:javascript 复制 <?php namespace App\Model;use Lib\Database\Model;use App\Model\Article;classUserextendsModel{protected$table='users';publicfunctionarticles(){return$this->hasMany(Article::class,'user_id','id');}} 最后是分类 Category 模型:...
ThelaratablesQueryConditions()method can also be used to add joins on the base table. This is particularly useful if you need to define custom searching and sorting based on related models, for example: /*** Join roles to base users table.* Assumes roles -> users is a one-to-many rela...
Getting related models from other tableImagine 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...
* Revert the changes to the database. * *@returnvoid */publicfunctiondown(){Schema::drop('users'); } } 让我们首先讨论我们的up()方法。我们的目标是创建users表并定义其中的字段。为了实现这个目标,我们将使用 Laravel 的Schema类。在创建或修改表时,我们使用Schema类的table()方法。