django-rest-framework raises an error in a model when accessing another model with a foreign key
0
I have two models, one referring the other one:
class RatesTable(models.Model):
hotel = models.ForeignKey(Hotel, on_delete=models.PROTECT, related_name='rates_tables', verbose_name=_('Hotel'))
contract = models.ForeignKey(Contract, on_delete=models.PROTECT, null=True, blank=True, related_name='rates_tables', verbose_name=_('Contract'))
name = models.CharField(max_length=100, verbose_name=_('Name'))
description = models.TextField(null=True, blank=True, verbose_name=_('Description'))
is_base = models.BooleanField(verbose_name=_('Is a base rate-table?'))
start_date = models.DateField(null=True, blank=True, verbose_name=_('Start Date'))
due_date = models.DateField(null=True, blank=True, verbose_name=_('Due Date'))
release = models.IntegerField(verbose_name=_('Release'))
class Meta:
verbose_name = _('Rates Table')
verbose_name_plural = _('Rates Tables')
unique_together = ('contract', 'start_date', 'due_date')
indexes = [
models.Index(fields=['hotel',]),
]
def __str__(self):
return "[{}][{}]{} {} {}-{}".format(self.id, self.hotel.name, self.contract.id, self.name, self.start_date, self.due_date)
class Rate(models.Model):
rates_table = models.ForeignKey(RatesTable, on_delete=models.PROTECT, related_name='rates', verbose_name=_('Rates Table'))
product = models.ForeignKey(Product, on_delete=models.PROTECT, related_name='product_rates', verbose_name=_('Product'))
rate = models.FloatField(verbose_name=_('Rate'))
class Meta:
verbose_name = _('Rate')
verbose_name_plural = _('Rates')
unique_together = ('rates_table', 'product')
def __str__(self):
return "[{}][{}][{}]{}".format(self.id, self.rates_table.contract, self.rates_table.id, self.product.name)
Each one has its own standard end-point in urls.py. End-point for model RatesTable works perfectly, but end-point for model Rate raises this error: return "[{}][{}]{} {} {}-{}".format(self.id, self.hotel.name, self.contract.id, self.name, self.start_date, self.due_date), and this error is raised on method
AttributeError: 'NoneType' object has no attribute 'id'__str__(self) of model RatesTable, not model Rate!
I don't know why DRF raises an error in the referenced model. It's the only case it happens, and I have many models with foreign keys
django django-models django-rest-framework
asked Nov 13 '18 at 5:44
Hugo Luis Villalobos CantoHugo Luis Villalobos Canto
540214
add a comment |
0
I have two models, one referring the other one:
class RatesTable(models.Model):
hotel = models.ForeignKey(Hotel, on_delete=models.PROTECT, related_name='rates_tables', verbose_name=_('Hotel'))
contract = models.ForeignKey(Contract, on_delete=models.PROTECT, null=True, blank=True, related_name='rates_tables', verbose_name=_('Contract'))
name = models.CharField(max_length=100, verbose_name=_('Name'))
description = models.TextField(null=True, blank=True, verbose_name=_('Description'))
is_base = models.BooleanField(verbose_name=_('Is a base rate-table?'))
start_date = models.DateField(null=True, blank=True, verbose_name=_('Start Date'))
due_date = models.DateField(null=True, blank=True, verbose_name=_('Due Date'))
release = models.IntegerField(verbose_name=_('Release'))
class Meta:
verbose_name = _('Rates Table')
verbose_name_plural = _('Rates Tables')
unique_together = ('contract', 'start_date', 'due_date')
indexes = [
models.Index(fields=['hotel',]),
]
def __str__(self):
return "[{}][{}]{} {} {}-{}".format(self.id, self.hotel.name, self.contract.id, self.name, self.start_date, self.due_date)
class Rate(models.Model):
rates_table = models.ForeignKey(RatesTable, on_delete=models.PROTECT, related_name='rates', verbose_name=_('Rates Table'))
product = models.ForeignKey(Product, on_delete=models.PROTECT, related_name='product_rates', verbose_name=_('Product'))
rate = models.FloatField(verbose_name=_('Rate'))
class Meta:
verbose_name = _('Rate')
verbose_name_plural = _('Rates')
unique_together = ('rates_table', 'product')
def __str__(self):
return "[{}][{}][{}]{}".format(self.id, self.rates_table.contract, self.rates_table.id, self.product.name)
Each one has its own standard end-point in urls.py. End-point for model RatesTable works perfectly, but end-point for model Rate raises this error: return "[{}][{}]{} {} {}-{}".format(self.id, self.hotel.name, self.contract.id, self.name, self.start_date, self.due_date), and this error is raised on method
AttributeError: 'NoneType' object has no attribute 'id'__str__(self) of model RatesTable, not model Rate!
I don't know why DRF raises an error in the referenced model. It's the only case it happens, and I have many models with foreign keys
django django-models django-rest-framework
asked Nov 13 '18 at 5:44
Hugo Luis Villalobos CantoHugo Luis Villalobos Canto
540214
yourself.rates_tablerelation may beNone
– JPG
Nov 13 '18 at 5:45
Nope, it is not the case. I don't have any record with a null value in the foreign key column.
– Hugo Luis Villalobos Canto
Nov 13 '18 at 5:50
1
You'd definedcontractasnull=True, it may be the issue
– JPG
Nov 13 '18 at 5:56
1
@JPG You are right!!! it was so.
– Hugo Luis Villalobos Canto
Nov 13 '18 at 17:10
add a comment |
0
0
0
I have two models, one referring the other one:
class RatesTable(models.Model):
hotel = models.ForeignKey(Hotel, on_delete=models.PROTECT, related_name='rates_tables', verbose_name=_('Hotel'))
contract = models.ForeignKey(Contract, on_delete=models.PROTECT, null=True, blank=True, related_name='rates_tables', verbose_name=_('Contract'))
name = models.CharField(max_length=100, verbose_name=_('Name'))
description = models.TextField(null=True, blank=True, verbose_name=_('Description'))
is_base = models.BooleanField(verbose_name=_('Is a base rate-table?'))
start_date = models.DateField(null=True, blank=True, verbose_name=_('Start Date'))
due_date = models.DateField(null=True, blank=True, verbose_name=_('Due Date'))
release = models.IntegerField(verbose_name=_('Release'))
class Meta:
verbose_name = _('Rates Table')
verbose_name_plural = _('Rates Tables')
unique_together = ('contract', 'start_date', 'due_date')
indexes = [
models.Index(fields=['hotel',]),
]
def __str__(self):
return "[{}][{}]{} {} {}-{}".format(self.id, self.hotel.name, self.contract.id, self.name, self.start_date, self.due_date)
class Rate(models.Model):
rates_table = models.ForeignKey(RatesTable, on_delete=models.PROTECT, related_name='rates', verbose_name=_('Rates Table'))
product = models.ForeignKey(Product, on_delete=models.PROTECT, related_name='product_rates', verbose_name=_('Product'))
rate = models.FloatField(verbose_name=_('Rate'))
class Meta:
verbose_name = _('Rate')
verbose_name_plural = _('Rates')
unique_together = ('rates_table', 'product')
def __str__(self):
return "[{}][{}][{}]{}".format(self.id, self.rates_table.contract, self.rates_table.id, self.product.name)
Each one has its own standard end-point in urls.py. End-point for model RatesTable works perfectly, but end-point for model Rate raises this error: return "[{}][{}]{} {} {}-{}".format(self.id, self.hotel.name, self.contract.id, self.name, self.start_date, self.due_date), and this error is raised on method
AttributeError: 'NoneType' object has no attribute 'id'__str__(self) of model RatesTable, not model Rate!
I don't know why DRF raises an error in the referenced model. It's the only case it happens, and I have many models with foreign keys
django django-models django-rest-framework
asked Nov 13 '18 at 5:44
Hugo Luis Villalobos CantoHugo Luis Villalobos Canto
540214
I have two models, one referring the other one:
class RatesTable(models.Model):
hotel = models.ForeignKey(Hotel, on_delete=models.PROTECT, related_name='rates_tables', verbose_name=_('Hotel'))
contract = models.ForeignKey(Contract, on_delete=models.PROTECT, null=True, blank=True, related_name='rates_tables', verbose_name=_('Contract'))
name = models.CharField(max_length=100, verbose_name=_('Name'))
description = models.TextField(null=True, blank=True, verbose_name=_('Description'))
is_base = models.BooleanField(verbose_name=_('Is a base rate-table?'))
start_date = models.DateField(null=True, blank=True, verbose_name=_('Start Date'))
due_date = models.DateField(null=True, blank=True, verbose_name=_('Due Date'))
release = models.IntegerField(verbose_name=_('Release'))
class Meta:
verbose_name = _('Rates Table')
verbose_name_plural = _('Rates Tables')
unique_together = ('contract', 'start_date', 'due_date')
indexes = [
models.Index(fields=['hotel',]),
]
def __str__(self):
return "[{}][{}]{} {} {}-{}".format(self.id, self.hotel.name, self.contract.id, self.name, self.start_date, self.due_date)
class Rate(models.Model):
rates_table = models.ForeignKey(RatesTable, on_delete=models.PROTECT, related_name='rates', verbose_name=_('Rates Table'))
product = models.ForeignKey(Product, on_delete=models.PROTECT, related_name='product_rates', verbose_name=_('Product'))
rate = models.FloatField(verbose_name=_('Rate'))
class Meta:
verbose_name = _('Rate')
verbose_name_plural = _('Rates')
unique_together = ('rates_table', 'product')
def __str__(self):
return "[{}][{}][{}]{}".format(self.id, self.rates_table.contract, self.rates_table.id, self.product.name)
Each one has its own standard end-point in urls.py. End-point for model RatesTable works perfectly, but end-point for model Rate raises this error: return "[{}][{}]{} {} {}-{}".format(self.id, self.hotel.name, self.contract.id, self.name, self.start_date, self.due_date), and this error is raised on method
AttributeError: 'NoneType' object has no attribute 'id'__str__(self) of model RatesTable, not model Rate!
I don't know why DRF raises an error in the referenced model. It's the only case it happens, and I have many models with foreign keys
django django-models django-rest-framework
django django-models django-rest-framework
asked Nov 13 '18 at 5:44
Hugo Luis Villalobos CantoHugo Luis Villalobos Canto
540214
asked Nov 13 '18 at 5:44
Hugo Luis Villalobos CantoHugo Luis Villalobos Canto
540214
edited Nov 13 '18 at 5:45
Hugo Luis Villalobos Canto
asked Nov 13 '18 at 5:44
Hugo Luis Villalobos CantoHugo Luis Villalobos Canto
540214
asked Nov 13 '18 at 5:44
Hugo Luis Villalobos CantoHugo Luis Villalobos Canto
540214
asked Nov 13 '18 at 5:44
Hugo Luis Villalobos CantoHugo Luis Villalobos Canto
540214
540214
yourself.rates_tablerelation may beNone
– JPG
Nov 13 '18 at 5:45
Nope, it is not the case. I don't have any record with a null value in the foreign key column.
– Hugo Luis Villalobos Canto
Nov 13 '18 at 5:50
1
You'd definedcontractasnull=True, it may be the issue
– JPG
Nov 13 '18 at 5:56
1
@JPG You are right!!! it was so.
– Hugo Luis Villalobos Canto
Nov 13 '18 at 17:10
add a comment |
yourself.rates_tablerelation may beNone
– JPG
Nov 13 '18 at 5:45
Nope, it is not the case. I don't have any record with a null value in the foreign key column.
– Hugo Luis Villalobos Canto
Nov 13 '18 at 5:50
1
You'd definedcontractasnull=True, it may be the issue
– JPG
Nov 13 '18 at 5:56
1
@JPG You are right!!! it was so.
– Hugo Luis Villalobos Canto
Nov 13 '18 at 17:10
your
self.rates_table relation may be None– JPG
Nov 13 '18 at 5:45
your
self.rates_table relation may be None– JPG
Nov 13 '18 at 5:45
Nope, it is not the case. I don't have any record with a null value in the foreign key column.
– Hugo Luis Villalobos Canto
Nov 13 '18 at 5:50
Nope, it is not the case. I don't have any record with a null value in the foreign key column.
– Hugo Luis Villalobos Canto
Nov 13 '18 at 5:50
1
1
You'd defined
contract as null=True, it may be the issue– JPG
Nov 13 '18 at 5:56
You'd defined
contract as null=True, it may be the issue– JPG
Nov 13 '18 at 5:56
1
1
@JPG You are right!!! it was so.
– Hugo Luis Villalobos Canto
Nov 13 '18 at 17:10
@JPG You are right!!! it was so.
– Hugo Luis Villalobos Canto
Nov 13 '18 at 17:10
add a comment |
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your
self.rates_tablerelation may beNone– JPG
Nov 13 '18 at 5:45
Nope, it is not the case. I don't have any record with a null value in the foreign key column.
– Hugo Luis Villalobos Canto
Nov 13 '18 at 5:50
1
You'd defined
contractasnull=True, it may be the issue– JPG
Nov 13 '18 at 5:56
1
@JPG You are right!!! it was so.
– Hugo Luis Villalobos Canto
Nov 13 '18 at 17:10