Opened 13 years ago

Last modified 13 years ago

#17253 closed New feature

Add foreign object in memory without saving to database — at Initial Version

Reported by: cyberkoa@… Owned by: nobody
Component: Database layer (models, ORM) Version: 1.3
Severity: Normal Keywords:
Cc: Triage Stage: Unreviewed
Has patch: no Needs documentation: no
Needs tests: no Patch needs improvement: no
Easy pickings: no UI/UX: no

Description

Similar to the following post
http://stackoverflow.com/questions/7908349/django-making-relationships-in-memory-without-saving-to-db?answertab=active#tab-top

class Group:

name = models.Chars()

def save():

super(self, Group).save()
# access foreign objects
members = self.groupmember_set.all()



class GroupMember:

group = models.ForeignKey(Group)
member = modesl.ForeignKey(User)

I have a page to allow people to create Group , and invited existing user to become member.

When form is submitted, Group data and GroupMember data is submitted together.

I would like to override the Group's save function() , and in the save function(), I need to access the GroupMember data.

Example code

g = Group(name='abc')
gm1 = GroupMember(member=user1, group=g)
gm2 = GroupMember(member=user2, group=g)

g.groupmember_set.add(gm1) # Add to memory , I do not want to save to db immediately
g.groupmember_set.add(gm2) # Add to memory , I do not want to save to db immediately
g.save()
gm1.save()
gm2.save()

Since the .add() function save the related object to db immediately , causing error.

I do not want to save the Group object first , because it will trigger 2 times save()


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