Mongodb-engine and Django create custom ObjectId

Question

Is it possible to create a custom ObjectId in a django model that is being saved to a mongodb using mongodb-engine? I've tried to do this passing the string I want into the ObjectId type, Flight(_id=ObjectId(myid)) for example but then this gives me an error saying that the string is not a valid id. Is it possible to override the id with a custom one? And is there somewhere where I can read about this or what the rules for creating an ID are?

example:

File "/usr/local/lib/python2.7/dist-packages/bson/objectid.py", line 172, in __validate raise InvalidId("%s is not a valid ObjectId" % oid) InvalidId: short_profile_4fcad5e8e5095f5a4f000000 is not a valid ObjectId

What is the exact error, please?

Daniel Roseman
– Daniel Roseman

2011-02-17 12:12:45 +00:00
Commented Feb 17, 2011 at 12:12 — Daniel Roseman
– Daniel Roseman, Commented Feb 17, 2011 at 12:12

Andrew Orsich · Accepted Answer · 2011-02-17 13:18:16Z

0

For sure you can your custom objectId, check objectId documentation for that , but i don't unsdestand fot what you need it.

Instead of ObjectId you can use any type that you want. So you can make _id string and insert any strting value instead of mongo ObjectId. But your custom _id must be unique for each member of a collection. This is enforced if the collection has an index on _id, which is the case by default.

from documentation

Although _id values can be of any type, a special BSON datatype is provided for object ids. This type is a 12-byte binary value designed to have a reasonably high probability of being unique when allocated. All of the officially-supported MongoDB drivers use this type by default for _id values. Also, the Mongo database itself uses this type when assigning _id values on inserts where no _id value is present.

answered Feb 17, 2011 at 13:18

Andrew Orsich

53.8k17 gold badges142 silver badges134 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

gomesr Over a year ago

So what I actually want is to set a string as my _id but I keep getting this error: AutoField (default primary key) values must be strings representing an ObjectId on MongoDB (got u'ryanair-DU...' instead) Any ideas what might be wrong? My model has _id = models.CharField(db_index=True)

Collectives™ on Stack Overflow

Mongodb-engine and Django create custom ObjectId

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related