Move suggestion adding to unit class

trans/models/unit.py

@@ -878,3 +878,26 @@ class Unit(models.Model):
             position__gte=self.position - appsettings.NEARBY_MESSAGES,
             position__lte=self.position + appsettings.NEARBY_MESSAGES,
         )
+
+    def add_suggestion(self, target):
+        '''
+        Creates new suggestion for this unit.
+        '''
+        # Create the suggestion
+        Suggestion.objects.create(
+            target=target,
+            checksum=self.checksum,
+            language=self.translation.language,
+            project=self.translation.subproject.project,
+            user=user
+        )
+        # Record in change
+        Change.objects.create(
+            unit=unit,
+            action=Change.ACTION_SUGGESTION,
+            translation=unit.translation,
+            user=user
+        )
+        # Update suggestion count
+        self.translation.have_suggestion += 1
+        self.translation.save()

trans/views/edit.py

@@ -109,22 +109,9 @@ def translate(request, project, subproject, lang):
                             )
                         )
                     # Create the suggestion
-                    sug = Suggestion.objects.create(
-                        target=join_plural(form.cleaned_data['target']),
-                        checksum=unit.checksum,
-                        language=unit.translation.language,
-                        project=unit.translation.subproject.project,
-                        user=user
+                    unit.add_suggestion(
+                        join_plural(form.cleaned_data['target'])
                     )
-                    # Record in change
-                    Change.objects.create(
-                        unit=unit,
-                        action=Change.ACTION_SUGGESTION,
-                        translation=unit.translation,
-                        user=user
-                    )
-                    # Invalidate counts cache
-                    unit.translation.invalidate_cache('suggestions')
                     # Invite user to become translator if there is nobody else
                     recent_changes = Change.objects.content().filter(
                         translation=unit.translation,