how to get desired column from other table - php

Question

there are two tables products and categories, that I created by PHPMyAdmin.
In the products table, it has a column name prd_category that has the foreign key of table categories named cat_id(primary key of categories table).
i am quite new in laravel
i want return all data from product table with category name(cat_name) from another table
//here is my controller
use App\Models\product;
class items extends Controller
{
public function sample(){
return product::all();
}
}
//route
Route::get('/',[items::class,'sample']);
//model for products table
class product extends Model
{
use HasFactory;
function category(){
return $this->hasOne('App\Models\category','cat_id','prd_id');
}
}
//model for category
class category extends Model
{
protected $table='categories';
use HasFactory;
}
pls help and thanks in advance..

Answer 1

you can use this code:
$products = product::whereHas('category',function($q)use($cat_name){
$q->where('name',$cat_name)
})->get();
or :
$categories = Category::where('name',$cat_name)->get()->pluck('id')->toArray()
$products = product::whereIn('category_id',$categories)->get();

Answer 2

Are you sure that one-to-many relation is correct? If a product can belong to many categories, you need to use many-to-many relations. Furthermore, if something else belongs to categories you should use many-to-many polymorphic relations. But let's go with one-to-many.
First, the relation function in Product.php looks incorrect. I think products should belong to a category.
function category(){
return $this->belongsTo('App\Models\Category','cust_name','name');
}
Then you need to define reverse relation in Category.php
function products(){
return $this->hasMany('App\Models\Product','cust_name','name');
}
When you define the relations properly, all you need yo do is to fetch data in controller:
use App\Models\Category
...
Category::with('products')->get();

Answer 3

you can use relationship with forign key like pro_id
function category(){
return $this->belongsTo('App\Models\Category','pro_id');
}
function products(){
return $this->hasMany('App\Models\Product','id');
}
$cat = Category::with('products')->all();
in Blade :
{{ $cat->products->cat_name; }}