我正在尝试使用两个主键更新模型。
由于django没有正式支持它,我正在使用解决方法:
class myModel(models.Model):
class Meta:
unique_together = (('key1', 'key2'),)
key1= models.IntegerField(blank=False, primary_key=True)
key2= models.CharField(blank=False, max_length=30)
attr3 = models.CharField(max_length=30)
attr4 = models.CharField(max_length=30)
但是每当我尝试更新现有对象时,我都会收到以下错误:
django.db.utils.IntegrityError: UNIQUE constraint failed: myApp_myModell.key1, myApp_myModel.key2
我尝试了以下更新我的模型:
myModel.objects.update_or_create(
key1=kw1,
key2= kw2,
defaults={
'attr3':attr3_str,
'attr4':attr4_str,
})
以及以下内容:
defaults={
'attr3':attr3_str
'attr4':attr4_str,
}
try:
obj = myModel.objects.get(key1=kw1, key2=kw2)
for key, value in defaults:
settatr(obj, key, value)
obj.save()
except myModel.DoesNotExist:
print("DOESNT EXISIT")
new_values = {'key1': kw1, 'key2': kw2}
new_values.update(defaults)
obj = myModel(**new_values)
obj.save()
如何在不出现完整性错误的情况下更新模型的任何想法?
答案 0 :(得分:1)
我不知道导致真正问题的原因,但删除我模型中的blank=False
和primary_key=True
对我有用:
class myModel(models.Model):
class Meta:
unique_together = (('key1', 'key2'),)
key1= models.IntegerField()
key2= models.CharField(max_length=30)
attr3 = models.CharField(max_length=30)
attr4 = models.CharField(max_length=30)
与
defaults={
'attr3':attr3_str
'attr4':attr4_str,
}
try:
obj = myModel.objects.get(key1=kw1, key2=kw2)
for key, value in defaults:
setattr(obj, key, value)
obj.save()
except myModel.DoesNotExist:
new_values = {'key1': kw1, 'key2': kw2}
new_values.update(defaults)
obj = myModel(**new_values)
obj.save()
感谢您的帮助!