Laravel - Efficient Way to Query Monthly Data per Category - php

Question

I'm working on a project that requires me to generate a report similar to this:
Category Total Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
-----------------------------------------------------------------------
Category 1 97 10 10 10 10 10 5 10 10 7 5 5 5
Category 2 120 10 10 10 10 10 10 20 10 5 5 10 10
Category 3 5 0 0 0 3 0 2 0 0 0 0 0 0
This report needs to be generated from data similar to this:
id category_id type year month amount
----------------------------------------------------------
1 1 16 2016 1 4
2 1 23 2016 1 6
3 1 76 2016 2 3
4 1 27 2016 2 3
5 1 18 2016 2 4
In the report, each month's number is simply the sum of the amount for that particular category, year, and month. I can do this just fine by querying the database for each month and for each category, but this type of approach doesn't scale very well if I need to generate a report with about a hundred categories because it would take over 1,200 queries (100 categories X 12 months)!
Any suggestions of how to make this more efficient?
Thanks!

Answer 1

The solution is grouping by two columns.I added the necessary code to format the results as you want.
Item::where('year', $year)
->groupBy('month', 'category_id')
->selectRaw('sum(amount) as sum, month, category_id')
->orderBy('category_id')
->orderBy('month')
->get()
->groupBy('category_id')
->map(function($item){
$item = $item->pluck('sum', 'month');
$item['total'] = $item->sum();
return $item;
});

Answer 2

Is this what you're looking for?
Category::where('year', 2016)
->select('month', 'year', DB::raw('SUM(amount) as amountTotal'))
->groupBy('month', 'year')
->get();