Add class methods for get by id in models.

accountant/api/models/accounts.py

@@ -44,3 +44,7 @@ class Account(db.Model):
         ).outerjoin(Entry).group_by(cls.id).order_by(cls.id)
 
         return query
+
+    @classmethod
+    def get(cls, session, id):
+        return session.query(cls).filter(cls.id == id).one()

accountant/api/models/entries.py

@@ -62,3 +62,7 @@ class Entry(db.Model):
         ).filter(cls.account_id == account_id).order_by("year", "month")
 
         return query
+
+    @classmethod
+    def get(cls, session, id):
+        return session.query(cls).filter(cls.id == id).one()

accountant/api/models/operations.py

@@ -95,3 +95,7 @@ class Operation(db.Model):
         ).group_by(cls.account_id)
 
         return query
+
+    @classmethod
+    def get(cls, session, id):
+        return session.query(cls).filter(cls.id == id).one()

accountant/api/models/scheduled_operations.py

@@ -67,3 +67,7 @@ class ScheduledOperation(db.Model):
         )
 
         return query
+
+    @classmethod
+    def get(cls, session, id):
+        return session.query(cls).filter(cls.id == id).one()