Save Times error after adding data
NOT NULL constraint failed:booktest_bookinfo.bpub_dataSource code
class BookInfo(models.Model):
btitld=models.CharField(max_length=20)
bpub_data=models.DateTimeField()
class HeroInfo(models.Model):
hname=models.CharField(max_length=10)
hgender=models.BooleanField()
hcontent=models.CharField(max_length=1000)
hbook=models.ForeignKey(BookInfo, on_delete=models.CASCADE) 
NOT NULL constraint failed:booktest_bookinfo.bpub_data
means non-empty restriction failed
it is possible that bpub_data was empty when data was added. Try to fill in the value for this field and try
again. variable name misspelled:
in BookInfo , it should be btitle instead of btitld , it should be bpub_date instead of bpub_data
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