app/forms/checks.py

@@ -14,17 +14,20 @@ def odometer_date_check(form, field):
     date = form.date.data
     pitstops = form.pitstops
 
+    if len(pitstops) > 0:
         if date < pitstops[0].date and odometer >= pitstops[0].odometer:
             raise ValidationError('The new odometer value must be less than %i km' % pitstops[0].odometer)
 
+        if date >= pitstops[-1].date and odometer <= pitstops[-1].odometer:
+            raise ValidationError('The new odometer value must be greater than %i km' % pitstops[-1].odometer)
+
+    if len(pitstops) > 1:
         for index in range(0, len(pitstops)-1):
             if pitstops[index].date <= date < pitstops[index + 1].date:
                 if odometer <= pitstops[index].odometer or odometer >= pitstops[index+1].odometer:
                     raise ValidationError('The new odometer value must be greater than %i km and less than %i km'
                                           % (pitstops[index].odometer,pitstops[index+1].odometer))
 
-    if date >= pitstops[-1].date and odometer <= pitstops[-1].odometer:
-        raise ValidationError('The new odometer value must be greater than %i km' % pitstops[-1].odometer)
 
 
 def date_check(form, field):

app/forms/pitstop.py

@@ -54,18 +54,27 @@ class CreatePitstopForm(FlaskForm):
             self.date.default = self.date.data
         else:
             self.date.default = date.today()
+
         if self.odometer.data:
             self.odometer.default = self.odometer.data
-        else:
+        elif len(self.pitstops) > 0:
             self.odometer.default = self.pitstops[-1].odometer
+        else:
+            self.odometer.default = 0
+
         if self.litres.data:
             self.litres.default = self.litres.data
-        else:
+        elif len(self.pitstops) > 0:
             self.litres.default = self.pitstops[-1].amount
+        else:
+            self.litres.default = 0
+
         if self.costs.data:
             self.costs.default = self.costs.data
-        else:
+        elif len(self.pitstops) > 0:
             self.costs.default = self.pitstops[-1].costs
+        else:
+            self.costs.default = 0
 
     def get_hint_messages(self):
         messages = {

app/routes/pitstop.py

@@ -67,7 +67,7 @@ def create_pit_stop_form(vid, cid):
         form.set_pitstops(vehicle.pitstops)
         form.same_odometer_allowed = (type(data[-1]) != Pitstop) or (data[-1].consumable.id != cid)
     else:
-        form.set_pitstops([Pitstop(date(1970, 1, 1), 0, vid, 0, ''),Pitstop(0, 0, date(1970, 1, 1), 0, cid)])
+        form.set_pitstops([])
         form.same_odometer_allowed = True
 
     # set the label of the litres field to make the user comfortable