Use date_trunc instead of splitting date into year and month

postgres/assignments.sql.go

@@ -54,7 +54,7 @@ func (q *Queries) DeleteAllAssignments(ctx context.Context, budgetID uuid.UUID)
 }
 
 const getAssignmentsByMonthAndCategory = `-- name: GetAssignmentsByMonthAndCategory :many
-SELECT year, month, category_id, budget_id, amount
+SELECT date, category_id, budget_id, amount
 FROM assignments_by_month
 WHERE assignments_by_month.budget_id = $1
 `
@@ -69,8 +69,7 @@ func (q *Queries) GetAssignmentsByMonthAndCategory(ctx context.Context, budgetID
 	for rows.Next() {
 		var i AssignmentsByMonth
 		if err := rows.Scan(
-			&i.Year,
+			&i.Date,
-			&i.Month,
 			&i.CategoryID,
 			&i.BudgetID,
 			&i.Amount,

postgres/categories.sql.go

@@ -124,37 +124,32 @@ func (q *Queries) GetCategories(ctx context.Context, budgetID uuid.UUID) ([]GetC
 
 const getCategoriesWithBalance = `-- name: GetCategoriesWithBalance :many
 SELECT categories.id, categories.name, category_groups.name as group, 
-    (COALESCE(
     (
-            SELECT SUM(a_hist.amount)
+        COALESCE((
-            FROM assignments a_hist
+            SELECT SUM(a_hist.amount) FROM assignments a_hist
-            WHERE categories.id = a_hist.category_id 
+            WHERE categories.id = a_hist.category_id AND a_hist.date < $1
-            AND a_hist.date < $1
+        ), 0)+COALESCE((
-        )
+            SELECT SUM(t_hist.amount) FROM transactions t_hist
-    , 0)+COALESCE(
+            WHERE categories.id = t_hist.category_id AND t_hist.date < $1
+        ), 0)
+    )::decimal(12,2) as available,
     (
-            SELECT SUM(t_hist.amount)
+        COALESCE((
-            FROM transactions t_hist
+            SELECT SUM(a_hist.amount) FROM assignments a_hist
-            WHERE categories.id = t_hist.category_id 
+            WHERE categories.id = a_hist.category_id AND a_hist.date < $2
-            AND t_hist.date < $1
+        ), 0)+COALESCE((
-        )
+            SELECT SUM(t_hist.amount) FROM transactions t_hist
-    , 0))::decimal(12,2) as available, 
+            WHERE categories.id = t_hist.category_id AND t_hist.date < $2
-    COALESCE(
+        ), 0)
-        (
+    )::decimal(12,2) as available_last_month, 
-            SELECT SUM(t_this.amount)
+    COALESCE((
-            FROM transactions t_this
+            SELECT SUM(t_this.amount) FROM transactions t_this
-            WHERE categories.id = t_this.category_id 
+            WHERE categories.id = t_this.category_id AND t_this.date >= $2 AND t_this.date < $1
-            AND t_this.date >= $2 AND t_this.date < $1
+        ), 0)::decimal(12,2) as activity,
-        )
+    COALESCE((
-    , 0)::decimal(12,2) as activity,
+            SELECT SUM(a_hist.amount) FROM assignments a_hist
-    COALESCE(
+            WHERE categories.id = a_hist.category_id AND a_hist.date >= $2 AND a_hist.date < $1
-        (
+        ), 0)::decimal(12,2) as assigned
-            SELECT SUM(a_hist.amount)
-            FROM assignments a_hist
-            WHERE categories.id = a_hist.category_id 
-            AND a_hist.date >= $2 AND a_hist.date < $1
-        )
-    ,0)::decimal(12,2) as assigned
 
 FROM categories
 INNER JOIN category_groups ON categories.category_group_id = category_groups.id

postgres/models.go

@@ -25,8 +25,7 @@ type Assignment struct {
 }
 
 type AssignmentsByMonth struct {
-	Year       float64
+	Date       time.Time
-	Month      float64
 	CategoryID uuid.UUID
 	BudgetID   uuid.UUID
 	Amount     int64
@@ -68,8 +67,7 @@ type Transaction struct {
 }
 
 type TransactionsByMonth struct {
-	Year       float64
+	Date       time.Time
-	Month      float64
 	CategoryID uuid.NullUUID
 	BudgetID   uuid.UUID
 	Amount     int64

postgres/schema/202112081529_views-for-months.sql

@@ -1,16 +1,16 @@
 -- +goose Up
 CREATE VIEW transactions_by_month AS 
-        SELECT extract(year from transactions.date) as year, extract(month from transactions.date) as month, transactions.category_id, accounts.budget_id, SUM(amount) as amount
+        SELECT date_trunc('month', transactions.date)::date as date, transactions.category_id, accounts.budget_id, SUM(amount) as amount
         FROM transactions
         INNER JOIN accounts ON accounts.id = transactions.account_id
-        GROUP BY extract(year from transactions.date), extract(month from transactions.date), transactions.category_id, accounts.budget_id;
+        GROUP BY date_trunc('month', transactions.date), transactions.category_id, accounts.budget_id;
 
 CREATE VIEW assignments_by_month AS 
-        SELECT extract(year from assignments.date) as year, extract(month from assignments.date) as month, assignments.category_id, category_groups.budget_id, SUM(amount) as amount
+        SELECT date_trunc('month', assignments.date)::date as date, assignments.category_id, category_groups.budget_id, SUM(amount) as amount
         FROM assignments
         INNER JOIN categories ON categories.id = assignments.category_id
         INNER JOIN category_groups ON categories.category_group_id = category_groups.id
-        GROUP BY extract(year from assignments.date), extract(month from assignments.date), assignments.category_id, category_groups.budget_id;
+        GROUP BY date_trunc('month', assignments.date), assignments.category_id, category_groups.budget_id;
 
 -- +goose Down
 DROP VIEW transactions_by_month;

postgres/transactions.sql.go

@@ -64,7 +64,7 @@ func (q *Queries) DeleteAllTransactions(ctx context.Context, budgetID uuid.UUID)
 }
 
 const getTransactionsByMonthAndCategory = `-- name: GetTransactionsByMonthAndCategory :many
-SELECT year, month, category_id, budget_id, amount
+SELECT date, category_id, budget_id, amount
 FROM transactions_by_month
 WHERE transactions_by_month.budget_id = $1
 `
@@ -79,8 +79,7 @@ func (q *Queries) GetTransactionsByMonthAndCategory(ctx context.Context, budgetI
 	for rows.Next() {
 		var i TransactionsByMonth
 		if err := rows.Scan(
-			&i.Year,
+			&i.Date,
-			&i.Month,
 			&i.CategoryID,
 			&i.BudgetID,
 			&i.Amount,