On Feb 3, 2009, at 12:15 AM, Malcolm Tredinnick wrote: >> >> 1) How do I turn a row into a model object? There is some discussion >> of writing raw SQL in the docs (http://docs.djangoproject.com/en/dev/ >> topics/db/sql/#topics-db-sql), but I didn't see anything on turning >> the row into a model object. Do I need to create a dict from the row >> values and then call the model object's __init__ method? > > Yes. > >> Or is there >> something simpler that I'm missing? > > I realise that's just a turn of phrase, but when I read it > literally, I > have to wonder just how much simpler could it get? :-) > > You know the field attribute names, since you constructed the > query.You > have their values, returned from the database. So it's a one-liner: > > MyModel(**dict(zip(field_names, row_data)))
This is pretty simple, I agree. I came up with this exact code, but then ran into the FK problem, at which point I started wondering if I was just going about things the wrong way. > > >> 2) If the model object as a ForeignKey, then the construction of a >> model object is trickier. From playing around, it appears to be the >> case that the dict must have an object of the referenced type, not >> the value of the foreign key. This could make manual construction of >> model objects difficult. I must be doing something wrong -- forcing >> creation of the related objects seems wasteful, especially as it >> could propagate, (if the referenced object has its own FKs). > > If you know the id value for the referenced model, you can assign > to the > '*_id' attribute, which is the hidden field containing the related > value > (not the referred-to instance). For example, with a ForeignKey field > called "foo", you can create a model with foo_id=6 or whatever, to set > the appropriate element. Excellent, thanks. Jack --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Django users" group. To post to this group, send email to django-users@googlegroups.com To unsubscribe from this group, send email to django-users+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/django-users?hl=en -~----------~----~----~----~------~----~------~--~---
