From d9e28fb5a97468a502fd3d5fb94c996a45daa8d0 Mon Sep 17 00:00:00 2001
From: Alexis Lahouze <xals@lahouze.org>
Date: Thu, 25 May 2017 22:46:35 +0200
Subject: [PATCH] Add coelesce in income query.

---
 accountant/models/accounts.py | 24 +++++++++++++++---------
 1 file changed, 15 insertions(+), 9 deletions(-)

diff --git a/accountant/models/accounts.py b/accountant/models/accounts.py
index 3f63fa5..d7640d8 100644
--- a/accountant/models/accounts.py
+++ b/accountant/models/accounts.py
@@ -56,17 +56,23 @@ class Account(db.Model):
     def income(self, begin, end):
         """Return the income for a specific time period."""
         query = db.session.query(
-            db.func.sum(
-                Operation.value
-            ).filter(
-                db.func.sign(Operation.value) == -1
+            db.func.coalesce(
+                db.func.sum(
+                    Operation.value
+                ).filter(
+                    db.func.sign(Operation.value) == -1
+                ), 0
             ).label("expenses"),
-            db.func.sum(
-                Operation.value
-            ).filter(
-                db.func.sign(Operation.value) == 1
+            db.func.coalesce(
+                db.func.sum(
+                    Operation.value
+                ).filter(
+                    db.func.sign(Operation.value) == 1
+                ), 0
             ).label("revenues"),
-            db.func.sum(Operation.value).label("income")
+            db.func.coalesce(
+                db.func.sum(Operation.value), 0
+            ).label("income")
         ).filter(
             Operation.account_id == self.id,
         )