How to change the structure of eager loaded data efficiently in Laravel - laravel

Question

I'm loading a product eagerly with its relationship data in Laravel.
$product = Product::with('attributeValues.attribute')->find($id)->get();
Currently I get the response structure as follows.
[
{
"product_id": 1,
"product_name": "Shirt A",
"attribute_values": [
{
"attribute_value_id": 1,
"attribute_value": "small",
"attribute": {
"attribute_id": 1,
"attribute": "size"
}
},
{
"attribute_value_id": 1,
"attribute_value": "medium",
"attribute": {
"attribute_id": 1,
"attribute": "size"
}
},
...
]
},
...
]
The structure I expected to get is as follows.
[
{
"product_id": 1,
"product_name": "Shirt A",
"attribute": [
{
"attribute_id": 1,
"attribute": "size",
"attribute_values": [
{
"attribute_value_id": 1,
"attribute_value": "small"
},
{
"attribute_value_id": 1,
"attribute_value": "medium"
}
]
},
...
]
},
...
]
The current relationships of the models are as follows
class Product extends Model {
public function attributeValues(){
return $this->belongsToMany(AttributeValue::class, 'product_attributes');
}
}
class AttributeValue extends Model {
public function attribute(){
return $this->belongsTo(Attribute::class);
}
}
class Attribute extends Model { }
Currently I'm succeeded getting this structure correctly by using product and getting it attributes separately using raw queries. I'm trying to achieve a Eloquent way of doing this task.
The tables I have are as follows
products
+----+------+
| id | name |
+----+------+
product_attributes
+----+------------+--------------------+
| id | product_id | attribute_value_id |
+----+------------+--------------------+
attribute_values
+----+--------------+-------+
| id | attribute_id | value |
+----+--------------+-------+
attributes
+----+-----------+
| id | attribute |
+----+-----------+

Answer 1

you can use with inside with using custom eager loading:
$product = Product::with(['attributeValues'=>function($query){
$query->select(['attribute_value_id','attribute_value'])
->with('attribute:attribute_id,attribute');
}])->find($id)->get();

Answer 2

What about using collections methods ? I'm not an expert but i would have done something like this :
$products->map(function($product){
$attribute = $product->attribute_values->groupBy('attribute.attribute')->map(function($groupAttribute,$key){
$attribute_values = $groupAttribute->map(function($attribute) {
return ['attribute_value_id'=>$attribute->attribute_value_id,'attribute_value'=>$attribute->attribute_value];
});
return ['attribute_id' => 1 ,'attribute'=> $key , 'attribute_values' => $attribute_values ];
});
return [
'product_id'=>$product->product_id,
'product_name'=>$product->product_name,
'attribute'=>$attribute
];
});

Answer 3

Just do the following you will get the required result.
$product = Product::with('attribute.attributeValues')->find($id)->get();

Answer 4

The best way is to use JsonResource.
Here you can find a short and easy example
Just define ProductResource, attribyteValueResource, and AttributeResource
Here is the example:
PropertyResource:
use Illuminate\Http\Resources\Json\JsonResource;
class PropertyResource extends JsonResource
{
public function toArray($request): array
{
return [
'product_id' => $this->product_id,
'product_name' => $this->product_name,
'attribute_values' => AttributeResource::collect( $this->whenLoaded('attributeValues') ),
];
}
}
AttributeValueResource:
use Illuminate\Http\Resources\Json\JsonResource;
class AttributeValueResource extends JsonResource
{
public function toArray($request): array
{
return [
'attribute_value_id' => $this->attribute_value_id,
'attribute_value' => $this->attribute_value,
'attribute' => AttributeValueResource::make( $this->whenLoaded('attribute') ),
];
}
}
AttributeResource:
use Illuminate\Http\Resources\Json\JsonResource;
class AttributeResource extends JsonResource
{
public function toArray($request): array
{
return [
'attribute_id' => $this->attribute_id,
'attribute' => $this->attribute,
];
}
}
Then just use them:
$product = ProductResource::make(
Product::load('attributeValues.attribute')->find($id)
);