Laravel - I try build hasmany relation between card and product table . But I can not access products attributes . It shows null

EamunIslamNabid
June 1, 2024
176 views
0 votes
2 Answers

//my controller

public function show_card(){

    if(Auth::id())
    {
        $id=Auth::user()->id;
        $cards=Card::with('product_card')->where('user_id','=',$id)->get();
        return view('home.show_cart',compact('cards'));
    }
    else{
        return redirect('login');
    }
}

//product model

public function product_card()
{
    return $this->hasMany(Card::class,'product_id','id');
}


//card model

public function product_card() 
{ 
return $this->belongsTo(Product::class); 
}

//I want to access product table data using product_id foreign key in card table.`

Tags: laravel

Answers

- SaraRouzbahani
- June 1, 2024 at 11:06 am
- 0 votes
0
Your relations are incorrect. The Card model should have the belongsTo relationship to the Product model because a card belongs to a product. On the other hand, a product can have many cards so it should have a hasMany relationship to the Card model.

So do these modifications:
```
class Product extends Model {
    public function cards() {
        return $this->hasMany(Card::class, 'product_id', 'id');
    }
}
```
In the Card model:
```
class Card extends Model {
    public function product() {
        return $this->belongsTo(Product::class, 'product_id', 'id');
    }
}
```
In your controller:
```
public function show_card(){
    if(Auth::id()) {
        $id=Auth::user()->id;
        $cards=Card::with('product')->where('user_id','=',$id)->get();
        return view('home.show_cart',compact('cards'));
    } else {
        return redirect('login');
    }
}
```
In the view, you can access product information like this:
```
@foreach($cards as $card)
    {{ $card->product->name }}
@endforeach
```
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- Alimohammadrezai
- June 1, 2024 at 11:32 am
- 0 votes
0
In your Product model, you should define the relationship as a hasMany because one product can be associated with many cards:
```
public function cards()
{
    return $this->hasMany(Card::class, 'product_id', 'id');
}
```
In your Card model, you should define the relationship as a belongsTo because each card belongs to one product:
```
public function product()
{
    return $this->belongsTo(Product::class, 'product_id', 'id');
}
```
With these corrections, you should be able to access product attributes from the cards. Here’s how you would do it in your controller:
```
public function show_card()
{
    if(Auth::id())
    {
        $id = Auth::user()->id;
        $cards = Card::with('product')->where('user_id', $id)->get();
        return view('home.show_cart', compact('cards'));
    }
    else {
        return redirect('login');
    }
}
```
Now, when you access $card->product->attribute, you should get the attributes of the associated product. Make sure your database schema is correctly set up with the foreign key constraints.
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