作为Laravel 的重度使用者肯定都对多态关系不陌生,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))[1] 01 CodeWave系列:4.CodeWave 智能开发平台 模型构建及使用 前一节我们学习了CodeWave的页面布局和页面呈现,现在我们已经可以通过Code...
在处理外键问题时,可以使用Laravel提供的一些方法和函数,例如belongsTo、hasOne、hasMany、belongsToMany等,来定义和处理表与表之间的关联关系。 外键问题的应用场景包括: 用户和订单之间的关联:一个用户可以有多个订单,可以通过外键关联用户表和订单表。 文章和评论之间的关联:一篇文章可以有多个评论,可以通过外键关联文...
首先做好准备工作,为我们的user_card创建迁移: php artisanmake:migration create_user_card_table--create=user_card 修改up方法并执行迁移: publicfunctionup(){Schema::create('user_card',function(Blueprint$table){$table->increments('id');$table->integer('user_id');$table->string('number',20)->...
However, if you wish, you may return an anonymous class from your migration file. This is primarily useful if your application accumulates many migrations and two of them have a class name collision:<?php use Illuminate\Database\Migrations\Migration; return new class extends Migration { // };...
class CreatePhonesTable extends Migration { /** * Run the migrations. * * @return void */ public function up() { Schema::create('phones', function (Blueprint $table) { $table->increments('id'); $table->integer('number')->unsigned(); ...
publicfunctionposts(){return$this->morphedByMany(Post::class,'taggable');} 比较好的记忆方法是,在要被关联的模型里加一个以表格名称起名的方法,然后跟模型和关键词('taggable')进行关联,然后在另一个模型里放morphedByMany这个关键词,放对应的模型和关键词就行可以了。
让我们来看看我们的create_users_table migration应该是什么样子的: classCreate_Users_Table {/** * Make changes to the database. * *@returnvoid */publicfunctionup(){Schema::table('users',function($table){$table->create();$table->increments('id');$table->string('email');$table->string('...
To add a deleted_at column to your table, you may use the softDeletes method from a migration:$table->softDeletes();Now, when you call the delete method on the model, the deleted_at column will be set to the current timestamp. When querying a model that uses soft deletes, the "...
Post -> belongsTo -> Author Author -> hasMany -> Post Author -> hasOne -> Profile 迁移 让我们为每个数据表创建一个简表结构。我只添加了up()方法,因为 Laravel 将会为新的数据表自动添加down()方法。这些迁移文件放在了database/migrations/目录中: ...
publicfunctionorders(){return$this->belongsToMany(Order::class,'order_details','sku','order_id') ; } so when I try to reach the products from Order model I get an empty array even if there was product related to this order order_details migration ...