tinker returns null when ever I try to use the relationship(one to many or inverse)

[D-I-J]

i have one to may relationship between pharmacy and pharmacy Branch respectively.

`<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

class CreatePharmaciesTable extends Migration
{
/**
* Run the migrations.
*
* @return void
*/
public function up()
{
Schema::create('pharmacies', function (Blueprint $table) {
$table->id();
$table->string('name');
$table->integer('branches');

        $table->timestamps();
    });
}

/**
 * Reverse the migrations.
 *
 * @return void
 */
public function down()
{
    Schema::dropIfExists('pharmacies');
}

}
`

`<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

class CreatePharmacyBranchesTable extends Migration
{
/**
* Run the migrations.
*

• @return void
  */
  public function up()
  {
  Schema::create('pharmacy_branches', function (Blueprint $table) {
  $table->id();
  $table->bigInteger('p_id')->unsigned();
  $table->double('lat', 9, 6);
  $table->double('long', 9, 6);
  $table->timestamps();

        $table->foreign('p_id')
        ->references('id')
        ->on('pharmacies');
    });
  

  }

  /**

  • Reverse the migrations.
  • @return void
    */
    public function down()
    {
    Schema::dropIfExists('pharmacy_branches');
    }
    }
    `
    PharmacyBranch model

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class PharmacyBranch extends Model
{
    use HasFactory;

    public function pharmacy()
    {
        return $this->belongsTo(Pharmacy::class,'p_id');
    }
}

Pharmacy Model
`<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class Pharmacy extends Model
{
use HasFactory;

public function branches()
{
    return $this->hasMany(PharmacyBranch::class);
}

}
`

the error I get in tinker.

`>>> PharmacyBranch::find(9)->pharmacy
=> null

`