models.py with ManyToMany and progmatically adding data via a shell script - django

Question

First post to stackoverflow I did do a search and came up dry. I also own
the django book (Forcier,Bissex,Chun) and they don't explain how to do
this. In short I can't figure out how to progmatically add a data via
a python shell script to the ManyToMay model..
from django.db import models
from django.contrib import admin
class Client(models.Model):
client = models.CharField(max_length=256, primary_key=True)
access = models.DateField()
description = models.TextField()
host = models.CharField(max_length=256)
lineEnd = models.CharField(max_length=256)
options = models.TextField()
owner = models.CharField(max_length=100)
root = models.CharField(max_length=256)
submitOptions = models.CharField(max_length=256)
update = models.DateField()
def __unicode__(self):
return str(self.client)
admin.site.register(Client)
class Change(models.Model):
"""This simply expands out 'p4 describe' """
change = models.IntegerField(primary_key=True)
client = models.ManyToManyField(Client)
desc = models.TextField()
status = models.CharField(max_length=128)
def __unicode__(self):
return str(self.change)
admin.site.register(Change)
Here is what I have which works but I don't know how to add the
ManyToMany. I can't seem to figure out how to progmatically call it.
I know the row in SQL exists.
--- massImport.py ---
# Assume the client "clientspec" exists. I know how to create that if
neeeded.
changes = [ { 'change': 123, 'desc': "foobar", status': "foobar",
client': "clientspec", }]
for item in changes:
entry = Change(
change = item['change'],
desc = item['desc'],
status = item['status'],
# client = Client.objects.filter(client=item['client'])
)
entry.save()
Can anyone show me where the error of my ways is. I would really
appreciate it.
Thanks!!

Answer 1

Turns out Tiago was very close..
# Assume the client "clientspec" exists. I know how to create that if
neeeded.
changes = [ { 'change': 123, 'desc': "foobar", status': "foobar",
client': "clientspec", }]
for item in changes:
entry = Change()
entry.change = item['change']
entry.desc = item['desc']
entry.status = item['status']
entry.time = datetime.datetime.fromtimestamp(float(item['time']))
entry.client.add(Client.objects.get(client=item['client']))
entry.save()
So.. I will give props to Tiago

Answer 2

.filter returns a list, when you need is a single object, so you should use .get(client=item['client'])

Answer 3

I tried the code but i got error
ValueError: "<Change: 123 -- foobar>" needs to have a value for field "change" before this many-to-many relationship can be used
Manytomany(entry.client.add) can be used only after saving the field ie entry.save()
There may be a lot of clients so you can use:
changes = [{'change': 123, 'desc': "foobar", 'status': "foobar",
'client': ("client1","client2"),},{......]
for item in changes:
entry = Change(
change = item['change'],
desc = item['desc'],
status = item['status'],)
entry.save()
for c in item['client']:
entry.client.add(Client.objects.get(client=c))