How to select foreign key value in Laravel - php

Question

I've two tables one is car_category having the fields - id,type.
Another table named vehicle having field - c_id(FK Refers car - id).
Now I want to display the FK(c_id) value which is car-type.
I've below code in models,
class Car extends Model
{
protected $guarded = [];
protected $table = 'car_category';
public function vehicles()
{
return $this->hasMany('Vehicle');
}
}
vehicle model,
class Vehicle extends Model
{
protected $guarded = [];
protected $table = 'vehicles';
public function cars()
{
return $this->belongsTo('Car');
}
}
What 'll be my query for this? I've tried this code, results error.
$vehicles = "SELECT cars.cartype,vehicles.model FROM cars,vehicles
WHERE cars.id = vehicles.c_id";
How can I achieve this? Can anybody help me?

Answer 1

Try this
class Car extends Model
{
protected $guarded = [];
protected $table = 'car_category';
public function vehicles()
{
return $this->hasMany(Vehicle::class, 'c_id');
}
}
The vehicle model
class Vehicle extends Model
{
protected $guarded = [];
protected $table = 'vehicles';
public function cars()
{
return $this->belongsTo(Car::class, 'c_id');
}
}
Eloquent determines the foreign key of the relationship based on the model name. In this case, the Car model is automatically assumed to have a car_id foreign key. If you wish to override this convention, you may pass a second argument to the method
https://laravel.com/docs/5.5/eloquent-relationships#one-to-one
To get the Car along with their Vehicle information you can do a query using Eager Loading
$result = Car::with('vehicles')->get();

Answer 2

To get the Car along with their Vehicle information you can do a query using Eager Loading
$result = Car::with('vehicles')->get();
One more correction you have specified class name as string literals without specifying FQN, relationships in models should be defined using fully qualified name
Car Model
class Car extends Model
{
protected $guarded = [];
protected $table = 'car_category';
public function vehicles()
{
return $this->hasMany(\App\Models\Vehicle::class);
}
}
Vehicle Model
class Vehicle extends Model
{
protected $guarded = [];
protected $table = 'vehicles';
public function cars()
{
return $this->belongsTo(\App\Models\Car::class);
}
}

Answer 3

Change from class car to class Car
After that you can select with Car::first(), the related table data can be found in Car::first()->vehicles
You can also add a where() method on models, if you have more than one record, use a foreach()

Answer 4

In Model,
class Vehicle extends Model
{
protected $guarded = [];
protected $table = 'vehicles';
public function cars()
{
return $this->belongsTo(Car::class, 'c_id');
}
}
In controller,
$vehicles = Vehicle::all();
return view('vehicles.vehicle',['vehicles'=>$vehicles]);