Laravel get sums from models with two and more joins - php

Question

I want to get the sum of prices from contract table and sum of transactions together connected to user id. And how can i use where in this.
Table Contracts:
[
{
"id": 1,
"user_id":97,
"price":"100"
},
{
"id": 2,
"user_id":97,
"price":"200"
},
{
"id": 3,
"user_id":97,
"price":"300"
}
]
Table Transactions:
[
{
"id": 1,
"user_id":97,
"sum":"100"
},
{
"id": 2,
"user_id":97,
"sum":"200"
},
{
"id": 3,
"user_id":97,
"sum":"300"
}
]
My query:
$query = User::where([
['contracts_sum', '<', 'transactions_sum'],
])
->join('contracts', 'contracts.user_id', '=','users.id')
->join('transactions', 'users.id', '=','transactions.user_id')
->groupBy(['users.id'])
->select(
'users.id', 'users.name',
DB::raw('SUM(contracts.price) AS contracts_sum'),
DB::raw('SUM(transactions.sum) AS transactions_sum'),
)
->get();
But this variant returns sum multiplied to count of transactions table rows like this:
[
{
"id":97,
"name":"JOHN",
"contracts_sum":"1800",
"transactions_sum":"1800"
}
]
But i would like to get the data in this kind of form:
[
{
"id":97,
"name":"JOHN",
"contracts_sum":"600",
"transactions_sum":"600"
}
]

Answer 1

My advice would be to make use of laravel's relation feature, as it would make it a lot easier.
class User
{
public function transactions()
{
return $this->hasMany(Transaction::class, 'user_id', 'id');
}
public function contracts()
{
return $this->hasMany(Contract::class, 'user_id', 'id');
}
}
Then, in your controller, you could do the following:
$user = User::where('id', 97)
->withSum('contracts', 'price')
->withSum('transactions', 'sum')
->get();
return [
'id' => $user->id,
'name' => $user->name,
'contracts_sum' => $user->transactions_sum_sum,
'transactions_sum' => $user->contracts_sum_price
];
Not only does this look a lot cleaner, the query will be more efficient as well. More information on the aggregate functions can be found in the laravel documentation.