FWIW Ben, I had the same error, but under different circumstances (your message below is the top google result for the error!). For me, the problem was caused by a custom save() method in the model not calling super().save(). Did you omit such a method in your gist.github models?
On 6 September 2011 17:26, Ben Standefer <[email protected]> wrote: > > I think I might have found an issue related > to https://code.djangoproject.com/ticket/14849. The last comment says to > please email the django-dev group if there are any questions about the > ticket, so here I am. I've done my best to provide a complete test case. > I have an Event model with property 'times', which is a ManyToManyField to an > EventTime model. https://gist.github.com/c7d8319df96f5eb22cf3 > I am processing data from a POST request with a ModelForm on Event, with a > custom field and widget: https://gist.github.com/653adb9b0ecbcc823339 The > widget takes a few POST fields and generates a set of date ranges as a list > of tuples [(<start>, <end>), (<start>, <end>)...]. The to_python() method of > the custom field takes the date ranges and returns a list of EventTime > objects. > When I try to .save_m2m() the form (test case > here: https://gist.github.com/6da4f69ade9bc7dc5b3c) I get... > ValueError: Cannot add "<EventTime: EventTime object>": instance is on > database "default", value is on database "None" > > This looks it might be an issue with the new multi-database stuff. I could > also be misunderstanding something, but after scouring the documentation for > several hours I don't see anything implying that this wouldn't work. I > suspect the unusual thing I'm doing is creating instances of a Django model > within my field's to_python() method. Most of the existing fields use > to_python() to cast to datetime or Decimal. Is it not possible to convert > value(s) into instances of Django models? > Thanks for your help. > -Ben Standefer > -Ben > > -- > You received this message because you are subscribed to the Google Groups > "Django developers" group. > To view this discussion on the web visit > https://groups.google.com/d/msg/django-developers/-/uVcisHlDAzkJ. > To post to this group, send email to [email protected]. > To unsubscribe from this group, send email to > [email protected]. > For more options, visit this group at > http://groups.google.com/group/django-developers?hl=en. -- Dr Greg Turner Director, Technical Information Architect the Interaction Consortium http://interaction.net.au Phone: +61 2 8060 1067 skype: gregturner Follow us on twitter: @theixc @gsta Be green! Read from the screen. -- You received this message because you are subscribed to the Google Groups "Django developers" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/django-developers?hl=en.
