feat: update admin

backend/app/models/users.go

@@ -310,3 +310,24 @@ func (m *usersModel) HasBought(ctx context.Context, userID, postID int64) (bool,
 
 	return userPost.ID > 0, nil
 }
+
+// Count
+func (m *usersModel) Count(ctx context.Context, cond BoolExpression) (int64, error) {
+	tbl := table.Users
+	stmt := tbl.
+		SELECT(COUNT(tbl.ID).AS("cnt")).
+		WHERE(cond)
+
+	m.log.Infof("sql: %s", stmt.DebugSql())
+
+	var cnt struct {
+		Cnt int64
+	}
+
+	if err := stmt.QueryContext(ctx, db, &cnt); err != nil {
+		m.log.Errorf("error counting users: %v", err)
+		return 0, err
+	}
+
+	return cnt.Cnt, nil
+}