Merge pull request #6037 from readthedocs/agj/fix-translation-form-save

Fix issue with save on translation form

readthedocs/projects/forms.py

@@ -614,12 +614,18 @@ def get_translation_queryset(self):
         )
         return queryset
 
-    def save(self):
-        project = self.parent.translations.add(self.translation)
-        # Run symlinking and other sync logic to make sure we are in a good
-        # state.
-        self.parent.save()
-        return project
+    def save(self, commit=True):
+        if commit:
+            # Don't use ``self.parent.translations.add()`` here as this
+            # triggeres a problem with database routing and multiple databases.
+            # Directly set the ``main_language_project`` instead of doing a
+            # bulk update.
+            self.translation.main_language_project = self.parent
+            self.translation.save()
+            # Run symlinking and other sync logic to make sure we are in a good
+            # state.
+            self.parent.save()
+        return self.parent
 
 
 class TranslationForm(SettingsOverrideObject):