Check whether database cache is up to date before saving

trans/models.py

@@ -207,6 +207,13 @@ class Translation(models.Model):
     def get_store(self):
         return factory.getobject(os.path.join(self.subproject.get_path(), self.filename))
 
+    def check_sync(self):
+        '''
+        Checks whether database is in sync with git and possibly does update.
+        '''
+        blob = self.get_git_blob()
+        self.update_from_blob(blob)
+
     def update_from_blob(self, blob, force = False):
         '''
         Updates translation data from blob.

trans/views.py

@@ -54,6 +54,7 @@ def translate(request, project, subproject, lang):
     if request.method == 'POST':
         form = TranslationForm(request.POST)
         if form.is_valid():
+            obj.check_sync()
             unit = Unit.objects.get(checksum = form.cleaned_data['checksum'], translation = obj)
             unit.target = form.cleaned_data['target']
             unit.fuzzy = form.cleaned_data['fuzzy']