I don't see any error. Did you forget to post it? On August 31, 2022 5:57:32 AM CDT, tech george <techgeor...@gmail.com> wrote: >Hello, > >Sorry for the late reply. > >I changed the models as below and added checkConstraint , But when I >migrate I get the below error. > >What am I still doing wrong? > >class Stock(models.Model): > quantity = models.PositiveIntegerField(default='0', blank=True, >null=True) > reorder_level = models.PositiveIntegerField(default='0', blank=True, >null=True) > >class Meta: > CheckConstraint(check=Q(quantity__gt=0), name='quantity') > > > >On Tue, Aug 30, 2022 at 6:09 PM Thomas Couch <t.co...@ucl.ac.uk> wrote: > >> I don't see where you define the quantity variable, should that be >> instance.quantity? Also, presumably you want to check if quantity is >> greater than or equal to qu rather than 0. >> Try changing `if quantity > 0` to `if instance.quantity >= qu` >> >> >> On Tuesday, August 30, 2022 at 3:44:51 PM UTC+1 Ryan Nowakowski wrote: >> >>> On Mon, Aug 29, 2022 at 05:18:39PM +0300, tech george wrote: >>> > Please help crack the below code, I want to prevent negative stock, and >>> if >>> > the stock is == 0, deduct it from reorder_level instead. >>> > Currently, the stock goes negative. >>> > >>> > models.py >>> > >>> > class Stock(models.Model): >>> > quantity = models.IntegerField(default='0', blank=True, null=True) >>> > reorder_level = models.IntegerField(default='0', blank=True, null=True) >>> > >>> > class Dispense(models.Model): >>> > drug_id = models.ForeignKey(Stock, >>> > on_delete=models.SET_NULL,null=True,blank=False) >>> > dispense_quantity = models.PositiveIntegerField(default='1', >>> > blank=False, null=True) >>> > taken=models.CharField(max_length=300,null=True, blank=True) >>> >>> Maybe change quantity and reorder_level to PositiveIntegerField? >>> >> -- >> 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 django-users+unsubscr...@googlegroups.com. >> To view this discussion on the web visit >> https://groups.google.com/d/msgid/django-users/9ef2d260-7c1a-4ff1-95ca-c13ded5f9f7bn%40googlegroups.com >> <https://groups.google.com/d/msgid/django-users/9ef2d260-7c1a-4ff1-95ca-c13ded5f9f7bn%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 django-users+unsubscr...@googlegroups.com. >To view this discussion on the web visit >https://groups.google.com/d/msgid/django-users/CADYG20F0occUAajR%3DSseRtiW%2Bzjh4THmgN6FEFbFsGcpsmMLZg%40mail.gmail.com.
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