我可以使用另一个 M:M 实体创建自定义数据透视表名称吗？

Question

我仍在思考是否有办法创建自定义数据透视表名称？因为我创建了一个 documents 和 users 表与 document_user 这是我的 pivot table 和该表是为用户创建的已接收文档创建的。我计划为 document 和 user 创建另一个数据透视表，此表用于发送的文档，以便我可以了解历史记录。请参阅下面的代码。

create_document_user_table

public function up()
 {
    Schema::create('document_user',function (Blueprint $table)
    {
        $table->increments('id');
        $table->integer('user_id')->unsigned();
        $table->integer('document_id')->unsigned();

        $table->foreign('user_id')->references('id')->on('users')->onDelete('cascade');
        $table->foreign('document_id')->references('id')->on('documents')->onDelete('cascade');

        $table->unsignedInteger('sender_id')->nullable();
        $table->foreign('sender_id')->references('id')->on('users')->onDelete('cascade');

        $table->dateTime('dateReceived')->default(DB::raw('CURRENT_TIMESTAMP'));
        $table->timestamp('dateModified')->default(DB::raw('CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP'));
    });
 }

documents_table

public function up()
{
    Schema::create('documents', function (Blueprint $table) {
        $table->increments('id');
        $table->string('title');
        $table->text('content');
        $table->integer('category_id')->unsigned();
        $table->foreign('category_id')->references('id')->on('categories')->onDelete('cascade');
        $table->timestamps();
    });
}

users_table

public function up()
{
    Schema::create('users', function (Blueprint $table) {
        $table->increments('id');
        $table->string('first_name');
        $table->string('last_name');
        $table->string('middle_name');
        $table->string('email');
        $table->string('username');
        $table->string('address');
        $table->string('password');
        $table->string('remember_token');

        $table->integer('role_permission_id')->unsigned();

        $table->foreign('role_permission_id')->references('id')->on('roles_permissions_dt')->onDelete('cascade');
        $table->timestamps();
    });
}

这很好地将记录插入我的数据透视表。我打算实现的是每次我为 documents 插入记录时，这也会插入到我的自定义数据透视表中，而不仅仅是在我的 document_user 数据透视表中。任何帮助将不胜感激！感谢您的信息或提示。

更新

@Mina 感谢您提供的提示，但实际上这是我的插入或保存我的数据透视表。如何将它插入到我的修订表中？

文档控制器

public function postDocuments(Request $request)
{

    $this->validate($request,
    [
        'title' => 'required|regex:/(^[A-Za-z0-9 ]+$)+/|max:255',
        'content' => 'required',
        'category_id' => 'required',
        'recipient_id' => 'required',
    ]);     


    $document = new Document();
                                //Request in the form
    $document->title = $request->title;
    $document->content = $request->content;
    $document->category_id = $request->category_id;

    $document->save();
    $user = Auth::user();

    foreach($request->recipient_id as $recipientId)
    {
        $document->recipients()->sync([ $recipientId => ['sender_id' => $user->id]],false );
    }

    return redirect()->back();  
}

Answer 1

您可以随意调用数据透视表。

如前所述，确定表名 关系的连接表，Eloquent 会连接两个相关的模型 按字母顺序排列的名称。但是，您可以随意覆盖它 惯例。您可以通过将第二个参数传递给 belongsToMany 方法：

return $this->belongsToMany('App\Role', 'user_roles');

(Eloquent: Relationships #Many To Many)

在您的情况下，您需要像这样定义关系：

class User extends Model
{
    // other stuff

    createdDocuments()
    {
        return $this->belongsToMany('App\Document', 'document_user_created');
    }

    sentDocuments() // or receivedDocuments()
    {
        return $this->belongsToMany('App\Document', 'document_user_sent');
    }

    // other stuff
}


class Document extends Model
{
    // other stuff

    createdByUsers()
    {
        return $this->belongsToMany('App\User', 'document_user_created');
    }

    sentToUsers() // or sentFromUsers() or whatever it does mean
    {
        return $this->belongsToMany('App\User', 'document_user_sent');
    }

    // other stuff
}

Answer 2

您不需要另一个数据透视表。你需要一张这样的桌子：

public function up()
{
    Schema::create('revisions', function (Blueprint $table) {
        $table->increments('id');
        $table->integer('document_id')->unsigned();
        //Rest of table structure

        $table->foreign('document_id')->references('id')->on('document_user')->onDelete('cascade');
        $table->timestamps();
    });
}

当您需要创建新的修订版时：

$document = new Document;
//add $document attributes
$user->documents()->save($document);

$document->recipients->each(function($recipient){
      $id = $recipient->pivot->id;
      Revision::create(['document_id'=>$id]);
})