Django UNIQUE constraint
0
Django UNIQUE constraint failed error
django.db.utils.IntegrityError: UNIQUE constraint failed while I am using the unique together constraint in the models.
How can I use it properly?
While I am entering the data for the same publisher same issue same version number but different copy number I am getting the above error.
Is this the correct way to implement it??
class Book(models.Model):
publisher = models.IntegerField()
issue = models.CharField(max_length=255)
class Meta:
unique_together = ("publisher", "issue")
def __str__(self):
return "%s-%r" % (self.publisher,self.issue)
class Version(models.Model):
book = models.ForeignKey(Book, on_delete = models.CASCADE)
number = models.CharField(max_length=255)
book_name = models.CharField(max_length=255)
cover = models.ImageField(null=True)
description = models.CharField(max_length=255)
class Meta:
unique_together = ("book", "number")
def __str__(self):
return "%s %s" % (self.number, self.book)
class Copy(models.Model):
user = models.ForeignKey(settings.AUTH_USER_MODEL, default=1, on_delete=models.CASCADE)
version = models.ForeignKey(Version, on_delete = models.CASCADE)
number = models.IntegerField()
book_id = models.AutoField(primary_key=True)
book_size = models.CharField(null=True, blank=True,max_length=255)
def __str__(self):
return "%r" % (self.book_id)
class Meta:
unique_together = ("version", "number")
django django-models unique-constraint
asked Nov 28 '18 at 9:34
kkrkkr
308
|
show 2 more comments
0
Django UNIQUE constraint failed error
django.db.utils.IntegrityError: UNIQUE constraint failed while I am using the unique together constraint in the models.
How can I use it properly?
While I am entering the data for the same publisher same issue same version number but different copy number I am getting the above error.
Is this the correct way to implement it??
class Book(models.Model):
publisher = models.IntegerField()
issue = models.CharField(max_length=255)
class Meta:
unique_together = ("publisher", "issue")
def __str__(self):
return "%s-%r" % (self.publisher,self.issue)
class Version(models.Model):
book = models.ForeignKey(Book, on_delete = models.CASCADE)
number = models.CharField(max_length=255)
book_name = models.CharField(max_length=255)
cover = models.ImageField(null=True)
description = models.CharField(max_length=255)
class Meta:
unique_together = ("book", "number")
def __str__(self):
return "%s %s" % (self.number, self.book)
class Copy(models.Model):
user = models.ForeignKey(settings.AUTH_USER_MODEL, default=1, on_delete=models.CASCADE)
version = models.ForeignKey(Version, on_delete = models.CASCADE)
number = models.IntegerField()
book_id = models.AutoField(primary_key=True)
book_size = models.CharField(null=True, blank=True,max_length=255)
def __str__(self):
return "%r" % (self.book_id)
class Meta:
unique_together = ("version", "number")
django django-models unique-constraint
asked Nov 28 '18 at 9:34
kkrkkr
308
When did this error occured? While migrating?
– a_k_v
Nov 28 '18 at 9:36
While posting my data after executing the migration
– kkr
Nov 28 '18 at 9:37
It cause because duplicate data already exist in your database!!!
– a_k_v
Nov 28 '18 at 9:49
I have removed the data and tried. The thing is I am having three different models and the unique together relationships are constructed across the the three tables. Is it possible to implement that?
– kkr
Nov 28 '18 at 9:51
Post some more code. Your model structure etc
– a_k_v
Nov 28 '18 at 9:53
|
show 2 more comments
0
0
0
Django UNIQUE constraint failed error
django.db.utils.IntegrityError: UNIQUE constraint failed while I am using the unique together constraint in the models.
How can I use it properly?
While I am entering the data for the same publisher same issue same version number but different copy number I am getting the above error.
Is this the correct way to implement it??
class Book(models.Model):
publisher = models.IntegerField()
issue = models.CharField(max_length=255)
class Meta:
unique_together = ("publisher", "issue")
def __str__(self):
return "%s-%r" % (self.publisher,self.issue)
class Version(models.Model):
book = models.ForeignKey(Book, on_delete = models.CASCADE)
number = models.CharField(max_length=255)
book_name = models.CharField(max_length=255)
cover = models.ImageField(null=True)
description = models.CharField(max_length=255)
class Meta:
unique_together = ("book", "number")
def __str__(self):
return "%s %s" % (self.number, self.book)
class Copy(models.Model):
user = models.ForeignKey(settings.AUTH_USER_MODEL, default=1, on_delete=models.CASCADE)
version = models.ForeignKey(Version, on_delete = models.CASCADE)
number = models.IntegerField()
book_id = models.AutoField(primary_key=True)
book_size = models.CharField(null=True, blank=True,max_length=255)
def __str__(self):
return "%r" % (self.book_id)
class Meta:
unique_together = ("version", "number")
django django-models unique-constraint
asked Nov 28 '18 at 9:34
kkrkkr
308
Django UNIQUE constraint failed error
django.db.utils.IntegrityError: UNIQUE constraint failed while I am using the unique together constraint in the models.
How can I use it properly?
While I am entering the data for the same publisher same issue same version number but different copy number I am getting the above error.
Is this the correct way to implement it??
class Book(models.Model):
publisher = models.IntegerField()
issue = models.CharField(max_length=255)
class Meta:
unique_together = ("publisher", "issue")
def __str__(self):
return "%s-%r" % (self.publisher,self.issue)
class Version(models.Model):
book = models.ForeignKey(Book, on_delete = models.CASCADE)
number = models.CharField(max_length=255)
book_name = models.CharField(max_length=255)
cover = models.ImageField(null=True)
description = models.CharField(max_length=255)
class Meta:
unique_together = ("book", "number")
def __str__(self):
return "%s %s" % (self.number, self.book)
class Copy(models.Model):
user = models.ForeignKey(settings.AUTH_USER_MODEL, default=1, on_delete=models.CASCADE)
version = models.ForeignKey(Version, on_delete = models.CASCADE)
number = models.IntegerField()
book_id = models.AutoField(primary_key=True)
book_size = models.CharField(null=True, blank=True,max_length=255)
def __str__(self):
return "%r" % (self.book_id)
class Meta:
unique_together = ("version", "number")
django django-models unique-constraint
django django-models unique-constraint
asked Nov 28 '18 at 9:34
kkrkkr
308
asked Nov 28 '18 at 9:34
kkrkkr
308
edited Nov 28 '18 at 10:03
kkr
asked Nov 28 '18 at 9:34
kkrkkr
308
asked Nov 28 '18 at 9:34
kkrkkr
308
asked Nov 28 '18 at 9:34
kkrkkr
308
308
When did this error occured? While migrating?
– a_k_v
Nov 28 '18 at 9:36
While posting my data after executing the migration
– kkr
Nov 28 '18 at 9:37
It cause because duplicate data already exist in your database!!!
– a_k_v
Nov 28 '18 at 9:49
I have removed the data and tried. The thing is I am having three different models and the unique together relationships are constructed across the the three tables. Is it possible to implement that?
– kkr
Nov 28 '18 at 9:51
Post some more code. Your model structure etc
– a_k_v
Nov 28 '18 at 9:53
|
show 2 more comments
When did this error occured? While migrating?
– a_k_v
Nov 28 '18 at 9:36
While posting my data after executing the migration
– kkr
Nov 28 '18 at 9:37
It cause because duplicate data already exist in your database!!!
– a_k_v
Nov 28 '18 at 9:49
I have removed the data and tried. The thing is I am having three different models and the unique together relationships are constructed across the the three tables. Is it possible to implement that?
– kkr
Nov 28 '18 at 9:51
Post some more code. Your model structure etc
– a_k_v
Nov 28 '18 at 9:53
When did this error occured? While migrating?
– a_k_v
Nov 28 '18 at 9:36
When did this error occured? While migrating?
– a_k_v
Nov 28 '18 at 9:36
While posting my data after executing the migration
– kkr
Nov 28 '18 at 9:37
While posting my data after executing the migration
– kkr
Nov 28 '18 at 9:37
It cause because duplicate data already exist in your database!!!
– a_k_v
Nov 28 '18 at 9:49
It cause because duplicate data already exist in your database!!!
– a_k_v
Nov 28 '18 at 9:49
I have removed the data and tried. The thing is I am having three different models and the unique together relationships are constructed across the the three tables. Is it possible to implement that?
– kkr
Nov 28 '18 at 9:51
I have removed the data and tried. The thing is I am having three different models and the unique together relationships are constructed across the the three tables. Is it possible to implement that?
– kkr
Nov 28 '18 at 9:51
Post some more code. Your model structure etc
– a_k_v
Nov 28 '18 at 9:53
Post some more code. Your model structure etc
– a_k_v
Nov 28 '18 at 9:53
|
show 2 more comments
0
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When did this error occured? While migrating?
– a_k_v
Nov 28 '18 at 9:36
While posting my data after executing the migration
– kkr
Nov 28 '18 at 9:37
It cause because duplicate data already exist in your database!!!
– a_k_v
Nov 28 '18 at 9:49
I have removed the data and tried. The thing is I am having three different models and the unique together relationships are constructed across the the three tables. Is it possible to implement that?
– kkr
Nov 28 '18 at 9:51
Post some more code. Your model structure etc
– a_k_v
Nov 28 '18 at 9:53