not a valid UUID.

[Benedict Uwazie]

I added a field called transaction_id in my models.py I want that field to be used to track every transaction on my "DuesLevy" model I imported uuid to this to happen, but each time I migrate I get this error.

How do i prevent this error from occurring each time I migrate (python manage.py migrate) File "C:\Users\Benedict\Miniconda3\envs\django3\lib\site-packages\django\db\models\fields\__init__.py", line 2344, in to_python

params={'value': value},

django.core.exceptions.ValidationError: ["'13615773708697' is not a valid UUID."]

my models.py

trans_id = uuid.uuid4()

trans_str = trans_id.int

pass_trans = str(trans_str)[:12]

cast_trans = int(pass_trans)

class DuesLevy(models.Model):

    class_of_dues = models.CharField(max_length=30, default=options.CHOOSE, choices=options.CLASS_OF_DUES, blank=True)

    payment_circle = models.CharField(max_length=30, default=options.CHOOSE, choices=options.PAYMENT_CIRCLE)

    payment_option = models.CharField(max_length=30, default=options.CHOOSE, choices=options.PAYMENT_OPTION)

    amount = models.DecimalField(max_digits=8, decimal_places=2)

    transaction_id = models.(max_length=100, unique=True, null=True, blank=True, editable=False, default=cast_trans)

    payment_channel = models.CharField(max_length=30, default=options.CHOOSE, choices=options.PAYMENT_CHANNEL_TYPE)

    payment_date = models.DateField()

    date_recorded = models.DateTimeField(auto_now_add=True)

    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)

    description = models.TextField(blank=True, null=True)

    def __str__(self):

        return self.amount

    

  

    def get_absolute_url(self):

        return reverse('backend:detail_dues', kwargs={'pk': self.id})

[Benedict Uwazie]

On Sunday, 3 May 2020 01:38:16 UTC+1, Benedict Uwazie wrote:

I added a field called transaction_id in my models.py I want that field to be used to track every transaction on my "DuesLevy" model I imported uuid to this to happen, but each time I migrate I get this error.

How do i prevent this error from occurring each time I migrate (python manage.py migrate) File "C:\Users\Benedict\Miniconda3\envs\django3\lib\site-packages\django\db\models\fields\__init__.py", line 2344, in to_python

params={'value': value},

django.core.exceptions.ValidationError: ["'13615773708697' is not a valid UUID."]

my models.py

trans_id = uuid.uuid4()

trans_str = trans_id.int

pass_trans = str(trans_str)[:12]

cast_trans = int(pass_trans)

class DuesLevy(models.Model):

    class_of_dues = models.CharField(max_length=30, default=options.CHOOSE, choices=options.CLASS_OF_DUES, blank=True)

    payment_circle = models.CharField(max_length=30, default=options.CHOOSE, choices=options.PAYMENT_CIRCLE)

    payment_option = models.CharField(max_length=30, default=options.CHOOSE, choices=options.PAYMENT_OPTION)

    amount = models.DecimalField(max_digits=8, decimal_places=2)

    transaction_id = models.UUIDField(max_length=100, unique=True, null=True, blank=True, editable=False, default=cast_trans)

[Motaz Hejaze]

default=cast_trans cast_trans = int(pass_trans)

UUID is string not int

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[Benedict Uwazie]

Still facing the same issue

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[Nomeh Uchenna Gabriel]

You're trying to shorten the UUID to 12 chars, that's not allowed

... simply change:

'pass_trans = str(trans_str[:12])'

to

pass_trans = str(trans_str)'

[Benedict Uwazie]

Thanks for your response I just found out u can't shorten UUID but I needed 12 digits

what I now did was to import  the code below

from random import randint
my_rand = randint(100000000000, 999999999999)
transaction_id = models.CharField(max_length=30, unique=True, null=True, blank=True, editable=False, default=my_rand)

Thanks

[Motaz Hejaze]

Great

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[Nomeh Uchenna Gabriel]

That looks good to you but is definitely a dangerous approach if the "12 digits" should be unique for each QuerySet since "random.random" can return dublicate numbers when called multiple times.

... I suggest you make a function for that or novicely adds the item's 'pk' to the random number making sure that it's still not more than 12 digits

[Nomeh Uchenna Gabriel]

[CONTINUED]
I just saw "unique=true" on that field

... you may not face the problems of using "random" just yet but must face it at some "random time in the future" - once you see something like this:

>>>: IntegrityError

... then shall you remember my reply.

The best option is to use a well guided function - I could even help you with that if you don't know much about it on my leisure.