Move balance calculations into DBs

internal/reports/accounts.go

@@ -6,7 +6,6 @@ import (
 	"github.com/aclindsa/moneygo/internal/models"
 	"github.com/aclindsa/moneygo/internal/store"
 	"github.com/yuin/gopher-lua"
-	"math/big"
 	"strings"
 )
 
@@ -147,14 +146,6 @@ func luaAccount__index(L *lua.LState) int {
 	return 1
 }
 
-func balanceFromSplits(splits *[]*models.Split) *big.Rat {
-	var balance big.Rat
-	for _, s := range *splits {
-		balance.Add(&balance, &s.Amount.Rat)
-	}
-	return &balance
-}
-
 func luaAccountBalance(L *lua.LState) int {
 	a := luaCheckAccount(L, 1)
 
@@ -176,23 +167,22 @@ func luaAccountBalance(L *lua.LState) int {
 		panic("SecurityId not in lua security_map")
 	}
 	date := luaWeakCheckTime(L, 2)
-	var splits *[]*models.Split
+	var balance *models.Amount
 	if date != nil {
 		end := luaWeakCheckTime(L, 3)
 		if end != nil {
-			splits, err = tx.GetAccountSplitsDateRange(user, a.AccountId, date, end)
+			balance, err = tx.GetAccountBalanceDateRange(user, a.AccountId, date, end)
 		} else {
-			splits, err = tx.GetAccountSplitsDate(user, a.AccountId, date)
+			balance, err = tx.GetAccountBalanceDate(user, a.AccountId, date)
 		}
 	} else {
-		splits, err = tx.GetAccountSplits(user, a.AccountId)
+		balance, err = tx.GetAccountBalance(user, a.AccountId)
 	}
 	if err != nil {
-		panic("Failed to fetch splits for account:" + err.Error())
+		panic("Failed to fetch balance for account:" + err.Error())
 	}
-	rat := balanceFromSplits(splits)
 	b := &Balance{
-		Amount:   models.Amount{*rat},
+		Amount:   *balance,
 		Security: security,
 	}
 

internal/store/db/transactions.go

@@ -305,53 +305,41 @@ func (tx *Tx) DeleteTransaction(t *models.Transaction, user *models.User) error
 	return nil
 }
 
-func (tx *Tx) GetAccountSplits(user *models.User, accountid int64) (*[]*models.Split, error) {
-	var modelsplits []*models.Split
-	var splits []*Split
-
-	sql := "SELECT DISTINCT splits.* FROM splits INNER JOIN transactions ON transactions.TransactionId = splits.TransactionId WHERE splits.AccountId=? AND transactions.UserId=?"
-	_, err := tx.Select(&splits, sql, accountid, user.UserId)
-	if err != nil {
-		return nil, err
-	}
-
-	for _, s := range splits {
-		modelsplits = append(modelsplits, s.Split())
-	}
-	return &modelsplits, nil
-}
-
 // Assumes accountid is valid and is owned by the current user
-func (tx *Tx) GetAccountSplitsDate(user *models.User, accountid int64, date *time.Time) (*[]*models.Split, error) {
+func (tx *Tx) getAccountBalance(xtrasql string, args ...interface{}) (*models.Amount, error) {
-	var modelsplits []*models.Split
+	var balance models.Amount
-	var splits []*Split
 
-	sql := "SELECT DISTINCT splits.* FROM splits INNER JOIN transactions ON transactions.TransactionId = splits.TransactionId WHERE splits.AccountId=? AND transactions.UserId=? AND transactions.Date < ?"
+	sql := "FROM splits INNER JOIN transactions ON transactions.TransactionId = splits.TransactionId WHERE splits.AccountId=? AND transactions.UserId=?" + xtrasql
-	_, err := tx.Select(&splits, sql, accountid, user.UserId, date)
+	count, err := tx.SelectInt("SELECT splits.SplitId "+sql+" LIMIT 1", args...)
+	if err != nil {
+		return nil, err
+	}
+	if count > 0 {
+		type bal struct {
+			Whole, Fractional int64
+		}
+		var b bal
+		err := tx.SelectOne(&b, "SELECT sum(splits.WholeAmount) AS Whole, sum(splits.FractionalAmount) AS Fractional "+sql, args...)
 		if err != nil {
 			return nil, err
 		}
 
-	for _, s := range splits {
+		balance.FromParts(b.Whole, b.Fractional, MaxPrecision)
-		modelsplits = append(modelsplits, s.Split())
 	}
-	return &modelsplits, nil
+
+	return &balance, nil
 }
 
-func (tx *Tx) GetAccountSplitsDateRange(user *models.User, accountid int64, begin, end *time.Time) (*[]*models.Split, error) {
+func (tx *Tx) GetAccountBalance(user *models.User, accountid int64) (*models.Amount, error) {
-	var modelsplits []*models.Split
+	return tx.getAccountBalance("", accountid, user.UserId)
-	var splits []*Split
+}
 
-	sql := "SELECT DISTINCT splits.* FROM splits INNER JOIN transactions ON transactions.TransactionId = splits.TransactionId WHERE splits.AccountId=? AND transactions.UserId=? AND transactions.Date >= ? AND transactions.Date < ?"
+func (tx *Tx) GetAccountBalanceDate(user *models.User, accountid int64, date *time.Time) (*models.Amount, error) {
-	_, err := tx.Select(&splits, sql, accountid, user.UserId, begin, end)
+	return tx.getAccountBalance(" AND transactions.date < ?", accountid, user.UserId, date)
-	if err != nil {
+}
-		return nil, err
-	}
 
-	for _, s := range splits {
+func (tx *Tx) GetAccountBalanceDateRange(user *models.User, accountid int64, begin, end *time.Time) (*models.Amount, error) {
-		modelsplits = append(modelsplits, s.Split())
+	return tx.getAccountBalance(" AND transactions.date >= ? AND transactions.Date < ?", accountid, user.UserId, begin, end)
-	}
-	return &modelsplits, nil
 }
 
 func (tx *Tx) transactionsBalanceDifference(accountid int64, transactions []*models.Transaction) (*big.Rat, error) {

internal/store/store.go

@@ -89,9 +89,9 @@ type TransactionStore interface {
 	GetTransactions(userid int64) (*[]*models.Transaction, error)
 	UpdateTransaction(t *models.Transaction, user *models.User) error
 	DeleteTransaction(t *models.Transaction, user *models.User) error
-	GetAccountSplits(user *models.User, accountid int64) (*[]*models.Split, error)
+	GetAccountBalance(user *models.User, accountid int64) (*models.Amount, error)
-	GetAccountSplitsDate(user *models.User, accountid int64, date *time.Time) (*[]*models.Split, error)
+	GetAccountBalanceDate(user *models.User, accountid int64, date *time.Time) (*models.Amount, error)
-	GetAccountSplitsDateRange(user *models.User, accountid int64, begin, end *time.Time) (*[]*models.Split, error)
+	GetAccountBalanceDateRange(user *models.User, accountid int64, begin, end *time.Time) (*models.Amount, error)
 	GetAccountTransactions(user *models.User, accountid int64, sort string, page uint64, limit uint64) (*models.AccountTransactionsList, error)
 }