如何在多对多关系的数据透视表上查找数据

Question

I have a Many To Many relationship between users & wallets .

So at the User.php Model:

public function wallets()
    {
        return $this->belongsToMany(Wallet::class,'user_wallet','user_id','wallet_id')->withPivot('balance');
    }

And at Wallet.php Model:

public function users()
    {
        return $this->belongsToMany(User::class,'user_wallet','user_id','wallet_id');
    }

And also the table Migration of user_wallet also goes here:

public function up()
    {
        Schema::create('user_wallet', function (Blueprint $table) {
            $table->bigIncrements('id');
            $table->unsignedBigInteger('user_id');
            $table->foreign('user_id')->references('usr_id')->on('users');
            $table->unsignedBigInteger('wallet_id');
            $table->foreign('wallet_id')->references('id')->on('wallets');
            $table->integer('balance');
            $table->timestamps();
        });
    }

Now I need to return a data based on it's User Id & Wallet Id, like this:

And at the Controller:

$bal = Wallet::where(['user_id' => $user_id, 'wallet_id' => $wallet_id]);

But this is wrong because the Model Wallet is connected to wallets table and not the pivot table which is user_wallet .

So how can I define user_wallet table for this where condition?

I would really appreciate any idea or suggestion from you guys about this...

Thanks in advance.

Answer 1

I think you can use whereHas

Wallet::with("users")->whereHas('users',function ($query)use($user_id){

        $query->where('user_id',$user_id);
     

    })->find($wallet_id)

or

Wallet::with("users")->whereHas('users',function ($query)use($user_id,$wallet_id){

        $query->where('user_id',$user_id);
        $query->where('wallet_id',$wallet_id);

    })->first()

And also relationship need to be updated in wallet model

public function users() { 

    return $this->belongsToMany(User::class,'user_wallet','wallet_id','user_id'); 
}