El mar., 11 de febrero de 2020 4:27 p.m., Mike Dewhirst < [email protected]> escribió:
> On 11/02/2020 7:06 pm, Bruckner de Villiers wrote: > > > > Jason, > > > > Thank you. I have changed the title of this mail. If I have read the > > 10 year old ticket 8576 correctly, it seems to be a DB restriction and > > I imagine that there are good reasons for this. However, then I don’t > > understand the purpose of the AutoField given the restrictions and > > that the Django documentation is somewhat ambiguous/vague. > > > > The options seem to be: > > > > * Your uuid suggestion (which I have never worked with, but will > > explore) > > * a function in the model that does the incrementing before > > committing – (anyone have some example code for this?). The > > challenge would be to keep track of the last used ticket no. I > > haven’t thought this through yet, but it does occur to me that one > > could use the id (maybe prefix the id with some starting digits) > > and write the record twice. Probably barking up the wrong tree. > > > > I have a need for a unique identifier in one of my models. I save the id > to a separate field in the same model. In my case I don't need to see > the value. It just needs to be unique and never change. It is used for > generating the equivalent of a bar-code in a different model. > > def save(self, *args, **kwargs): > if self.id: > if not self.formulation_no: > self.formulation_no = str(self.id) > super().save(*args, **kwargs) > > A downside to this is the formulation number stays blank until the next > save after creating the record. The upside is that the id isn't going to > change so uniqueness isn't lost. Another way of doing this is to copy > the id when it is first required and formulation_no is still blank. > > I have also been known to use a weird mechanism for user-resequencing > records in a display. In that case they are lesson sequences within a > course and question sequences within a lesson. I use floats and strings > in a pair of fields so if that is of interest just ask. > > Cheers > > Mike > > > * > > > > Regards, > > > > Bruckner de Villiers > > > > +27 83 625 1086 > > > > *From: *<[email protected]> on behalf of Jason > > <[email protected]> > > *Reply to: *<[email protected]> > > *Date: *Monday, 10 February 2020 at 14:55 > > *To: *Django users <[email protected]> > > *Subject: *Re: Adding a verbose_name to id field > > > > Hmm. TIL about https://code.djangoproject.com/ticket/8576 > > > > Would a a uuid for this, rather than an integer? If not, you'll have > > to implement a save override to handle the incrementing yourself. > > > > In addition, it might be worthwhile bringing this ticket up for > > discussion at https://groups.google.com/forum/#!forum/django-developers > > > > -- > > You received this message because you are subscribed to the Google > > Groups "Django users" group. > > To unsubscribe from this group and stop receiving emails from it, send > > an email to [email protected] > > <mailto:[email protected]>. > > To view this discussion on the web visit > > > https://groups.google.com/d/msgid/django-users/dc686528-0a8d-43ff-9973-d478cc765959%40googlegroups.com > > < > https://groups.google.com/d/msgid/django-users/dc686528-0a8d-43ff-9973-d478cc765959%40googlegroups.com?utm_medium=email&utm_source=footer > >. > > > > -- > > You received this message because you are subscribed to the Google > > Groups "Django users" group. > > To unsubscribe from this group and stop receiving emails from it, send > > an email to [email protected] > > <mailto:[email protected]>. > > To view this discussion on the web visit > > > https://groups.google.com/d/msgid/django-users/7C1BE52B-AFAE-4D38-9003-8A454A284A39%40gmail.com > > < > https://groups.google.com/d/msgid/django-users/7C1BE52B-AFAE-4D38-9003-8A454A284A39%40gmail.com?utm_medium=email&utm_source=footer > >. > > -- > You received this message because you are subscribed to the Google Groups > "Django users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To view this discussion on the web visit > https://groups.google.com/d/msgid/django-users/99dbcba0-22bd-7c1d-5fe6-68984353bfb1%40dewhirst.com.au > . > -- You received this message because you are subscribed to the Google Groups "Django users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/django-users/CAAGnT0hafj5viY5bYw5HioFxGX6dMgCc3yVSZ2CPA_DkqYS4sA%40mail.gmail.com.
