Laravel Eloquent 关系（5 表）

Question

我在数据库中有 5 个表

Volume: id, volume, number,...
论文: id,volume_id,title,...
Editor_name: id,idP(论文ID),name...
邮箱: id, idA(Editor_name_id), 邮箱
机构: id, idA(Editor_name_id), 机构

而且我需要在一个 blade.
中显示有关文章的所有信息（来自所有表的数据）例子
网址：papers/{paper_id}

第 1 卷第 1 期
标题 1
Editor_name1，电子邮件 1，电子邮件 2，机构 1
Editor_name2，电子邮件 3，机构 2，机构 3
...
迁移：
音量：

Schema::create('volume', function (Blueprint $table) {
        $table->bigIncrements('id');
        $table->integer("volume");
        $table->integer("number");
        $table->timestamps();       
    });

论文：

Schema::create('papers', function (Blueprint $table) {
        $table->bigIncrements('id');
        $table->string("title");            
        $table->integer("volume_id");            
        $table->foreign('volume_id')->references('id')->on('volume')->onDelete('cascade');
        $table->timestamps();

Editor_name:

Schema::create('editor_name', function (Blueprint $table) {
        $table->id();
        $table->integer("idP");
        $table->string("name");
        $table->timestamps();
        $table->foreign('idP')->references('id')->on('papers')->onDelete('cascade');

    });

邮箱：

Schema::create('email', function (Blueprint $table) {
        $table->bigIncrements('id');
        $table->integer("idA");
        $table->string("email");
        $table->timestamps();
        $table->foreign('idA')->references('id')->on('editor_name')->onDelete('cascade');;
    });

机构：

Schema::create('institution', function (Blueprint $table) {
        $table->bigIncrements('id');
        $table->integer("idA");
        $table->string("institution");
        $table->timestamps();
        $table->foreign('idA')->references('id')->on('editor_name')->onDelete('cascade');
    });

型号：
音量：

 public function names()
{
    return $this->hasManyThrough(Names::class, Papers::class,'issue','idP','id','id',);
}
public function papers()
{
    return $this->hasMany(Papers::class,'issue');
}

论文：

public function volume()
   {
       return $this->belongsTo(Volume::class,'issue');
}
  
   public function names()
   {
       return $this->hasMany(EditorName::class,'idP');
   }

姓名：

public function papers()
{
    return $this->belongsTo(Papers::class,'idP');
}

public function email()
{
    return $this->hasMany(Email::class,'idA');
}
public function institution()
{
    return $this->hasMany(Institution::class,'idA');
}

邮箱：

 public function names()
{
    return $this->belongsTo(Names::class,'idA');
}

机构：

 public function names()
{
    return $this->belongsTo(Names::class,'idA');
}

Answer 1

您可以这样获取所有信息:

public function show($paper_id) {

     $data = Papers::with('volume', 'names', 'names.email', 'names.institution')->findOrFail($paper_id);

     dd($data);
}

Laravel Eloquent 关系（5 表）

Laravel Eloquent relationship (5 tables)

php

model

laravel

eloquent

laravel-8