- Author:
- anentropic
- Posted:
- December 5, 2011
- Language:
- Python
- Version:
- 1.3
- Score:
- 0 (after 0 ratings)
Basically the idea is to import/update model instances from a json data that closely matches the model structure (i.e. identical field names)
From my answer to this question: http://stackoverflow.com/a/8377382/202168
See the original question for sample data format.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 | from django.db import models
def create_or_update_and_get(model_class, data):
# note we assume data is already deserialized to a dict
get_or_create_kwargs = {
model_class._meta.pk.name: data.pop(model_class._meta.pk.name)
}
try:
# get
instance = model_class.objects.get(**get_or_create_kwargs)
except model_class.DoesNotExist:
# create
instance = model_class(**get_or_create_kwargs)
# update (or finish creating)
for key,value in data.items():
field = model_class._meta.get_field(key)
if not field:
continue
if isinstance(field, models.ManyToManyField):
# can't add m2m until parent is saved
continue
elif isinstance(field, models.ForeignKey) and hasattr(value, 'items'):
rel_instance = create_or_update_and_get(field.rel.to, value)
setattr(instance, key, rel_instance)
else:
setattr(instance, key, value)
instance.save()
# now add the m2m relations
for field in model_class._meta.many_to_many:
if field.name in data and hasattr(data[field.name], 'append'):
for obj in data[field.name]:
rel_instance = create_or_update_and_get(field.rel.to, obj)
getattr(instance, field.name).add(rel_instance)
return instance
|
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