How to re-format laravel relationship collections - php

Question

I have the following models and their relationships:
Product - (name, price, qty)
Product Attribute (qty, price - when there is a combination, the qty and price here is the one getting)
Attribute - (size, color)
Attribute Values - (small, medium, large, red, blue, green etc)
// One to Many Relationship
$product->productAttributes (returns a collection)
// Many to Many Relationship
$productAttribute->attributeValues (returns a collection)
// One to Many Relationship
$attribute->attributeValues
I need to format it in such a way like:
array:2 [
"color" => array:2 [
0 => "red"
1 => "blue"
]
"size" => array:3 [
0 => "small"
1 => "medium"
2 => "large"
]
]
This is what I get when I iterate on the collections:
$attributes = $productAttributes->map(function (ProductAttribute $pa){
return $pa->attributesValues->map(function (AttributeValue $av) {
return [$av->attribute->name => $av->value];
});
})->all();
it obviously returns:
array:6 [▼
0 => Collection {#508 ▼
#items: array:2 [▼
0 => array:1 [▼
"Color" => "red"
]
1 => array:1 [▼
"Size" => "small"
]
]
}
1 => Collection {#525 ▼
#items: array:2 [▼
0 => array:1 [▼
"Color" => "red"
]
1 => array:1 [▼
"Size" => "medium"
]
]
}
2 => Collection {#535 ▼
#items: array:2 [▼
0 => array:1 [▼
"Color" => "red"
]
1 => array:1 [▼
"Size" => "large"
]
]
}
3 => Collection {#545 ▼
#items: array:2 [▼
0 => array:1 [▼
"Color" => "red"
]
1 => array:1 [▼
"Size" => "small"
]
]
}
]
Again, my intent is to format it like this:
array:2 [
"color" => array:2 [
0 => "red"
1 => "blue"
]
"size" => array:3 [
0 => "small"
1 => "medium"
2 => "large"
]
]
TIA!
Edit:
$product->productAttributes
Collection {#513 ▼
#items: array:6 [▼
0 => ProductAttribute {#514 ▼
#fillable: array:2 [▶]
#connection: "mysql"
#table: null
#primaryKey: "id"
#keyType: "int"
+incrementing: true
#with: []
#withCount: []
#perPage: 15
+exists: true
+wasRecentlyCreated: false
#attributes: array:6 [▶]
#original: array:6 [▼
"id" => 7
"quantity" => 3
"price" => "100.00"
"product_id" => 25
"created_at" => "2018-03-11 16:56:36"
"updated_at" => "2018-03-11 16:56:36"
]
#changes: []
#casts: []
#dates: []
#dateFormat: null
#appends: []
#dispatchesEvents: []
#observables: []
#relations: []
#touches: []
+timestamps: true
#hidden: []
#visible: []
#guarded: array:1 [▶]
}
1 => ProductAttribute {#515 ▶}
2 => ProductAttribute {#516 ▶}
3 => ProductAttribute {#517 ▶}
4 => ProductAttribute {#518 ▶}
5 => ProductAttribute {#519 ▶}
]
}
$productAttribute->attributeValues
array:6 [▼
0 => Collection {#507 ▼
#items: array:2 [▼
0 => AttributeValue {#521 ▼
#fillable: array:1 [▶]
#connection: "mysql"
#table: null
#primaryKey: "id"
#keyType: "int"
+incrementing: true
#with: []
#withCount: []
#perPage: 15
+exists: true
+wasRecentlyCreated: false
#attributes: array:5 [▶]
#original: array:7 [▼
"id" => 1
"value" => "red"
"attribute_id" => 1
"created_at" => "2018-03-11 16:49:15"
"updated_at" => "2018-03-11 16:49:15"
"pivot_product_attribute_id" => 7
"pivot_attribute_value_id" => 1
]
#changes: []
#casts: []
#dates: []
#dateFormat: null
#appends: []
#dispatchesEvents: []
#observables: []
#relations: array:1 [▶]
#touches: []
+timestamps: true
#hidden: []
#visible: []
#guarded: array:1 [▶]
}
1 => AttributeValue {#506 ▼
#fillable: array:1 [▶]
#connection: "mysql"
#table: null
#primaryKey: "id"
#keyType: "int"
+incrementing: true
#with: []
#withCount: []
#perPage: 15
+exists: true
+wasRecentlyCreated: false
#attributes: array:5 [▶]
#original: array:7 [▶]
#changes: []
#casts: []
#dates: []
#dateFormat: null
#appends: []
#dispatchesEvents: []
#observables: []
#relations: array:1 [▶]
#touches: []
+timestamps: true
#hidden: []
#visible: []
#guarded: array:1 [▶]
}
]
}
1 => Collection {#523 ▶}
2 => Collection {#530 ▶}
3 => Collection {#537 ▶}
4 => Collection {#544 ▶}
5 => Collection {#547 ▶}
]

Answer 1

I think, what you're looking for is something like the following;
$attributes = $productAttributes->pluck('attributesValue')
->flatten()
->unique()
->groupBy(function (AttributeValue $av) {
return $av->attribute->name;
})
->each(function (Collection $avs) {
$avs->map(function (AttributeValue $av) {
return $av->value;
});
});
Here's what the above code does;
Pull the relationship attributesValue for all results.
Flatten it out so we have one collection containing all attributesValue
Make sure we don't have any duplicates
We group everything so that we have something like colour => (collection of colour attributesValue)
Now we cycle through our multi level collection, and map the instances of AttributeValue so that each is replaced with their value
I've not ran this code myself, but I believe this will work.