Laravel MorphToMany 不适用于多列

Question

Laravel 版本：7.0 这是我的 table.

Schema::create('model_email_form', function (Blueprint $table) {
    $table->id();
    $table->string('model_type');
    $table->unsignedBigInteger('model_id');
    $table->unsignedBigInteger('email_id');
    $table->unsignedBigInteger('form_id');
    $table->timestamps();
});

这是我的 Service 模型。

public function forms()
{
    return $this->morphToMany(
        Form::class,
        'model',
        'model_email_form',
        'model_id',
        'form_id'
    );
}

public function emails()
{
    return $this->morphToMany(
        Email::class,
        'model',
        'model_email_form',
        'model_id',
        'email_id'
    );
}

我在 model_email_form table 中插入了数据，但是当我得到 service model 对象时，emails 和 forms 有空对象。

谁能帮帮我？

Answer 1

根据您的问题和评论：

有表格、电子邮件和服务。表单可以与任意数量的不同类型的模型相关联。电子邮件可以与任意数量的不同类型的模型相关联。一个服务可以有很多表单，一个服务可以有很多电子邮件。

以此为基础，这将是我们的模式：

Schema::create('forms', function (Blueprint $table) {
    $table->bigIncrements('id');
    $table->string('name'); // as an example
    ...
    $table->timestamps();
});

Schema::create('formables', function (Blueprint $table) {
    $table->unsignedBigInteger('form_id'); // the id of the form
    $table->unsignedBigInteger('formable_id'); // the associated model's id
    $table->string('formable_type'); // The associated model's class name
});

Schema::create('emails', function (Blueprint $table) {
    $table->bigIncrements('id');
    $table->string('subject'); // as an example
    ...
    $table->timestamps();
});

Schema::create('emailables', function (Blueprint $table) {
    $table->unsignedBigInteger('email_id'); // the id of the email
    $table->unsignedBigInteger('emailable_id'); // the associated model's id
    $table->string('emailable_type'); // The associated model's class name
});

Schema::create('services', function (Blueprint $table) {
    $table->bigIncrements('id');
    $table->string('name'); // as an example
    ...
    $table->timestamps();
});

使用该架构，我们可以创建具有以下关系的以下模型：

class Form extends Model
{
    public function services()
    {
        return $this->morphedByMany(Service::class, 'formable');
    }
   
    // Add the other morphedByMany relationships of forms
}

class Email extends Model
{
    public function services()
    {
        return $this->morphedByMany(Service::class, 'emailable');
    }
   
    // Add the other morphedByMany relationships of emails
}

class Service extends Model
{
    public function forms()
    {
        return $this->morphedToMany(Form::class, 'formable');
    }
   
    public function emails()
    {
        return $this->morphedToMany(Email::class, 'emailable');
    }
}

Laravel MorphToMany 不适用于多列

Laravel MorphToMany Doesn't Work for multi columns

php

polymorphism

laravel

eloquent

laravel-relations