South migrate error: name 'UUID' is not defined

Question

I have a model with a CharField field with a default value of uuid4:

f = models.CharField(default=uuid4, max_length=36, unique=True, blank=True)

and this is causing the following error:

Cannot successfully create field 'f' for model 'm': name 'UUID' is not defined.

running the migrate commmand! Ho can I fix this issue? so far I tried:

to define a "wrapper function" in the module for uuid (ie: def getUUID())
to set the default value of "f" by overriding the Model constructor

...but the problem remains :(

ps. I know that I can instruct south for custom fields, but I'm not using custom fields in my opinion :P

Firstly, that error doesn't correspond to the code you've posted, as `uuid4` is not the same as `UUID`. Secondly, have you defined or imported those names in your module? — Daniel Roseman, Feb 23 '13 at 13:58
uuid4 comes from uuid module! (it's printed uppercased by south somehow)... and yes, I have imported all the necessary dependencies for my model (it works fine in django) — daveoncode, Feb 23 '13 at 14:01
Find out that variable named `UUID` and it's value. There is no way to debug UUID from above code. If there is any traceback, post that. — Bibhas Debnath, Feb 23 '13 at 14:37
Bumped into the same issue, and took me a while to realize that uuid.uuid4() doesn't return a string, but an object of type uuid.UUID. — anttikoo, Jan 24 '14 at 11:19

score 16 · Accepted Answer · answered Feb 23 '13 at 15:02

I solved defining the following helper function in my model's module:

from uuid import uuid4

def generateUUID():
    return str(uuid4())

then:

f = models.CharField(default=generateUUID, max_length=36, unique=True, editable=False)

south will generate a migration file (migrations.0001_initial) with a generated UUID like:

default='5c88ff72-def3-4842-8d48-a75bb3240bb5'

this is pretty unhappy... since that string is "static", instead it must be created dynamically using the helper function... anyway in the django's world al seems working as expected... I added some records into the database and a new UUID was generated for each one. I then tried my first schema migration by adding a couple of fields to my model and they has been added to the database table as expected.

score 8 · Answer 2 · answered Jan 19 '14 at 18:50

8

You can also import UUID in your migration:

from uuid import UUID

answered Jan 19 '14 at 18:50

Mindscope

81
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2

As a drawback, you have to do it in each migration – Andrei Sep 22 '14 at 17:48

score 0 · Answer 3 · answered Jul 18 '19 at 08:58

0

I simply removed a uuid directory from 'node_modules' directory.

And then I reinstall uuid and it worked.

I hope it helped you guys <3

answered Jul 18 '19 at 08:58

JoyfulJoyce

13
5

score 0 · Answer 4 · answered Apr 22 '22 at 15:22

0

step 1 : install uuid

npm install uuid

step 2: then import it

import { v4 as uuid } from 'uuid';

step 3: Use it

id:uuid()

answered Apr 22 '22 at 15:22

Techie DOT subash

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South migrate error: name 'UUID' is not defined

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