i am trying to get the name using a relationship - laravel

Question

here what I am trying to get the name of the category by using a relationship
here so far what I have done is I have defined a relationship in my product model as such
Public function category()
{
return $this->belongsto(Category::class);
}
I have also stored the field category id
in my products table
Schema::create('products', function (Blueprint $table) {
$table->increments('id');
$table->integer('Category_id');
$table->string('name');
$table->string('code');
$table->string('color');
$table->string('description');
$table->double('price');
$table->integer('quantity');
$table->string('image');
$table->timestamps();
});
also I have defined a relationship in my Category model such as
public function product()
{
return $this->hasmany(Product::class);
}
ALSO I HAVE DEFINED Relationship IN
PRODUCT AS
Public function category()
{
return $this->belongsto(Category::class);
}
in my view I am trying to get the name of the category
#foreach($products as $pro)
<tr>
<td><img src="{{asset('uploads/maj/'.$pro->image)}}" class="img-circle" alt="User Image" width="50" height="50"> </td>
<td>{{$pro->category->name}}</td>
<td>{{$pro->name}}</td>
<td>{{$pro->code}}</td>
<td>{{$pro->color}}</td>
<td>{{$pro->description}}</td>
<td>{{$pro->price}}</td>
<td>{{$pro->quantity}}</td>
I am receiving the error
Trying to get property 'name' of non-object
how can I get the name of the category ??
I am trying to get it like this but this is giving error
{{$pro->category->name}}
the category table row
Schema::create('categories', function (Blueprint $table) {
$table->increments('id');
$table->String('Parent_id');
$table->string('name');
$table->string('status');
$table->timestamps();
});
my laravel version is 7 thanks

Answer 1

Maybe one or more product doesn't have category or category_id is wrong.
you can use condition to check if category is not exist:
{{$pro->category ? $pro->category->name : "no category"}}
or can simply using null coalescing operator:
{{$pro->category->name ?? "no category"}}
if category is required you should prevent it by add table relation/foreign.

Answer 2

try this
Schema::create('products', function (Blueprint $table) {
$table->increments('id');
$table->foreignId('category_id')->nullable()->constrained()->onDelete('cascade');
$table->string('name');
$table->string('code');
$table->string('color');
$table->string('description');
$table->double('price');
$table->integer('quantity');
$table->string('image');
$table->timestamps();
});
in model Product
public function category(){
return $this->belongsTo(Category::class,'category_id','id');
}
thin call products
$products = product::orderBy('created_at','asc')->with('category')->get();
you can chick if has relationship or not
#if(! empty($pro->category)) {{ $pro->category->name }} #else <span>no category</span> #endif

Answer 3

You should try like this way :
(!empty($pro->category)) ? $pro->category->name : 'No category found'

Answer 4

I think You should define foreign key properly because your category_id not follow the coding standard. if you Category Model are in App directory you can use pass namespace like this
Public function category()
{
return $this->belongsto('App\Category','Category_id','id');
}
other wise :
Public function category()
{
return $this->belongsto('App\Models\Category','Category_id','id');
}