Calculate the total of amount by category in Laravel - php

Question

I make this query :
$expenses = Expense::where('team_id', Auth::user()->currentTeam->id)
->with(['categories'])
->orderBy('entry_date', 'DESC')
->get();
ExpenseSumByCategoryResource :
return [
'id' => Hashids::encode($this->id),
'entry_date' => $this->entry_date,
'amount' => $this->amount,
'category' => $this->category->name
];
Response :
"expenses": [
{
"id": "GO3W1MkgWkngpnByQ6",
"entry_date": "2020-10-14",
"amount": "50.00",
"category": "Health"
},
{
"id": "7vK6bz0gnG7JBOYRLD",
"entry_date": "2020-10-14",
"amount": "30.00",
"category": "Uncategorize"
},
{
"id": "7vK6bz0gnG7JBOYRLD",
"entry_date": "2020-10-14",
"amount": "30.00",
"category": "Health"
},
{
"id": "7vK6bz0gnG7JBOYRLD",
"entry_date": "2020-10-14",
"amount": "30.00",
"category": "Food"
},
]
I would like to calculate, by category, the sum of "amount".
Ideally, I would like to have a result which is this :
"expenses": [
{
"category": "Health"
"total_amount": "80.00",
},
{
"category": "Uncategorized"
"total_amount": "30.00",
},
{
"category": "Food"
"total_amount": "30.00",
},
]

Answer 1

You may try adding a select() and groupBy() which makes sense for your query:
$expenses = Expense::select('category', DB::raw('SUM(amount) AS total_amount'))
->where('team_id', Auth::user()->currentTeam->id)
->groupBy('category')
->with(['categories'])
->orderBy('category')
->get();