Laravel Eloquent 5 Tables - php

Question

I have 5 tables.
Users
Categories
Products
Product_categories
Order Details
A user purchases an an item and in my order details table I store the quantities etc.
I wanted to return all items that are of the main category = 'Testing' via the user.
$user = Auth::user();
return $user->items();
I have the following relationship on my user model.
public function items()
{
return $this->hasMany('App\OrderDetail','user_id')->selectRaw('item_description,count(quantity) as count')->where('item_description','<>','Carriage')->groupBy('item_id')->get();
}
I know I've not associated the the categories table here but I'm wondering how I would pull all the users order details where item category is "testing". The item can be related to many categories hence the product_categories table.
I'm not after someone writing the answer I'd like to know where I start to look at linking these via the model?
Would I be right in saying I have to do a function within my model relation?

Answer 1

According to your requirements & structure, your table should be structured like this:
users
id
name
...
categories
id
name
...
products
id
name
cost
...
category_product
id
category_id
product_id
order_details
id
user_id
cost
...
product_order_detail
id
product_id
order_detail_id
Your models should be structured like this:
class User extends Model
{
public function orderDetails()
{
return $this->hasMany(OrderDetail::class);
}
}
class Product extends Model
{
public function categories()
{
return $this->belongsToMany(Category::class, 'category_product');
}
public function orderDetails()
{
return $this->belongsToMany(Order::class, 'product_order_detail');
}
}
class Category extends Model
{
public function product()
{
return $this->belongsToMany(Product::class, 'category_product');
}
}
class OrderDetail extends Model
{
public function user()
{
return $this->belongsTo(User::class);
}
public function products()
{
return $this->belongsToMany(Product::class, 'product_order_detail');
}
}
and to fetch all the items / products who belongs to the category named Testing and belongs to the user, who've ordered it:
$items = Product::whereHas('categories', function($q) {
$q->where('name', '=', 'Testing');
})->whereHas('orderDetails', function($q) use($user) {
$q->whereHas('user', function($q) use($user) {
$q->where('id', $user->id);
});
})->get();
Hope this helps!