Laravel - how to group data by key and save to array? - php

Question

I have table attribute_values(id, value, attr_group_id).
I need to return the collection grouped by key attr_group_id.
in clear php using ORM RedBean i made:
$data = \DB::table('attribute_values')->get();
$attrs = [];
foreach ($data as $k => $v){
$attrs [$v['attr_group_id']][$k] = $v['value'];
}
return $attrs;
I need same using Laravel, after this one:
$data = \DB::table('attribute_values')->get();
My table
id value attr_group_id
1 one 1
2 two 1
3 three 2
4 four 2
5 five 3
6 six 3
And i need result
Array(
[1] => Array
(
[1] => one
[2] => two
)
[2] => Array
(
[3] => three
[4] => four
)
[3] => Array
(
[5] => five
[6] => six
)
)

Answer 1

Fetch all data, and map it with attribute id of every row will work,
$data = \DB::table('attribute_values')->get();
$attrs = [];
foreach ($data as $key => $value) {
// -> as it return std object
$attrs[$value->attr_group_id][] = $value->value;
}
dd($attrs);

Answer 2

You can use the groupBy() function of collection as:
$data = \DB::table('attribute_values')->get()->groupBy('attr_group_id');
It merges records with same attr_group_id under this field's value as making key of the collection.

Answer 3

Doing all this in raw SQL will be more efficient, SQL database are quite good at these operations. SQL has a group by function, since you are overwriting value, i just get it out with max() (this seems weird, that you overwrite the value, do you actually just want unique results?).
DB::table('attribute_values')
->select('attr_group_id', DB::raw('max(value)'))
->groupBy('attr_group_id')
->get();
EDIT
Since the scope has changed, you can utilize Laravels Collection methods, that is opreations on a Collection.
DB::table('attribute_values')
->get()
->groupBy('attr_group_id')
->toArray();

Answer 4

Friends, this is a ready task that I needed !
I did it myself and you helped me. If anyone interested can read.
I'll explain to you why I needed this particular method. I am doing an online store with a clock and now there was a task to make filters and attributes for filters.
So there are three tables
attribute_groups table
attribute_products table
attribute_values
I need to display the Laravel widget on my .blade.php like as
{{ Widget::run('filter', 'tpl' => 'widgets.filter', 'filter' => null,]) }}
When i creating a new product in the admin panel.
I must to save the product id and attribute_id in attribute_products, but there can be as many attributes as possible for one product. so, if I'll use this option
$data = \DB::table('attribute_values')
->get()
->groupBy('attr_group_id')
->toArray();
I got result:
But! each new array starts with index 0. But I need an index that means its id. attr_group_id from table attribute_value for saving into attribute_products.
And after I see only one method for me.
$data = \DB::table('attribute_values')->get();
$attrs = [];
foreach ($data as $key => $value) {
$attrs[$value->attr_group_id][$value->id] = $value->value;
}
return $attrs;
and the result I was looking for
now you can see what's the difference and what was needed. Array index starts 1,2,3,4,5 and this index = attr_group_id. Unfortunately I could not initially ask the right question. thanks to all.

Answer 5

Laravel Version 5.8
So You need to Group the id
if You need in the Model Way I have created the Model as AttributeValue
$modelWay = \App\AttributeValue::get()
->groupBy('attr_group_id');
if You need in the DBWay I have created the table as attribute_values
$dbWay = \DB::table('attribute_values')
->get()
->groupBy('attr_group_id');
Both Will give the Same Result