/
balance.go
64 lines (54 loc) · 1.36 KB
/
balance.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
package pgsql
import (
"context"
"github.com/SlamJam/dolgovnya-backend/internal/app/models"
"github.com/pkg/errors"
)
func (s *Storage) GetUserAccount(ctx context.Context, userID models.UserID) (models.Account, error) {
var balance models.Account
err := psql.Select("debit.amount, credit.amount").
From("debit, credit").
Prefix(`
WITH debit as (
SELECT
COALESCE(sum(amount), 0) as amount
FROM accounting_entries
WHERE user_to = ?
), credit as (
SELECT
COALESCE(sum(amount), 0) as amount
FROM accounting_entries
WHERE user_from = ?
)`, userID, userID).
RunWith(s.pool).
QueryRow().
Scan(&balance.Debit, &balance.Credit)
return balance, errors.WithStack(err)
}
func (s *Storage) GetUserBalances(ctx context.Context, userID models.UserID) (map[models.UserID]models.Money, error) {
rows, err := psql.
Select("user_id, COALESCE(sum(amount), 0)").
From("balances").
GroupBy("user_id").
Prefix(`
WITH balances as (
SELECT
user_to as user_id,
amount
FROM accounting_entries
WHERE user_from = ?
UNION ALL
SELECT
user_from as user_id,
- amount
FROM accounting_entries
WHERE user_to = ?
)`, userID, userID).
RunWith(s.pool).
Query()
if err != nil {
return nil, errors.WithStack(err)
}
defer rows.Close()
return scanToMap[models.UserID, models.Money](rows)
}