How to change the data of a table field from another?
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Good evening.
The goal is that when creating the Transfer model, the sum field was subtracted from whom_from and added to whom_to Bill's model. As I understand it, this needs to be done through save (), but apparently, I did not set it up correctly. What could be the problem?
models.py
class Bill(models.Model):
title = models.CharField(max_length=100)
amount = models.DecimalField(max_digits=19, decimal_places=2,
validators=[MinValueValidator(0)], default=0)
def __str__(self):
return self.title
class Transfer(models.Model):
whom_from = models.ForeignKey(Bill, on_delete=models.CASCADE, related_name='whom_from')
whom_to = models.ForeignKey(Bill, on_delete=models.CASCADE, related_name='whom_to')
sum = models.DecimalField(max_digits=19, decimal_places=2, validators=[MinValueValidator(0)], default=0)
def save(self, *args, **kwargs):
self.whom_to.amount = self.whom_to.amount + self.sum
self.whom_from.amount = self.whom_from.amount - self.sum
super(Transfer, self).save(*args, **kwargs)
python django
asked Nov 10 at 19:18
Meekey
329
add a comment |
up vote
0
down vote
favorite
Good evening.
The goal is that when creating the Transfer model, the sum field was subtracted from whom_from and added to whom_to Bill's model. As I understand it, this needs to be done through save (), but apparently, I did not set it up correctly. What could be the problem?
models.py
class Bill(models.Model):
title = models.CharField(max_length=100)
amount = models.DecimalField(max_digits=19, decimal_places=2,
validators=[MinValueValidator(0)], default=0)
def __str__(self):
return self.title
class Transfer(models.Model):
whom_from = models.ForeignKey(Bill, on_delete=models.CASCADE, related_name='whom_from')
whom_to = models.ForeignKey(Bill, on_delete=models.CASCADE, related_name='whom_to')
sum = models.DecimalField(max_digits=19, decimal_places=2, validators=[MinValueValidator(0)], default=0)
def save(self, *args, **kwargs):
self.whom_to.amount = self.whom_to.amount + self.sum
self.whom_from.amount = self.whom_from.amount - self.sum
super(Transfer, self).save(*args, **kwargs)
python django
asked Nov 10 at 19:18
Meekey
329
1
You need to save whom_to and whom_from after changing their data.
– Daniel Roseman
Nov 10 at 19:26
@DanielRoseman How to do it?
– Meekey
Nov 10 at 20:18
1
Er, callself.whom_to.save().
– Daniel Roseman
Nov 10 at 20:21
@DanielRoseman thank you)
– Meekey
Nov 10 at 20:29
add a comment |
up vote
0
down vote
favorite
up vote
0
down vote
favorite
Good evening.
The goal is that when creating the Transfer model, the sum field was subtracted from whom_from and added to whom_to Bill's model. As I understand it, this needs to be done through save (), but apparently, I did not set it up correctly. What could be the problem?
models.py
class Bill(models.Model):
title = models.CharField(max_length=100)
amount = models.DecimalField(max_digits=19, decimal_places=2,
validators=[MinValueValidator(0)], default=0)
def __str__(self):
return self.title
class Transfer(models.Model):
whom_from = models.ForeignKey(Bill, on_delete=models.CASCADE, related_name='whom_from')
whom_to = models.ForeignKey(Bill, on_delete=models.CASCADE, related_name='whom_to')
sum = models.DecimalField(max_digits=19, decimal_places=2, validators=[MinValueValidator(0)], default=0)
def save(self, *args, **kwargs):
self.whom_to.amount = self.whom_to.amount + self.sum
self.whom_from.amount = self.whom_from.amount - self.sum
super(Transfer, self).save(*args, **kwargs)
python django
asked Nov 10 at 19:18
Meekey
329
Good evening.
The goal is that when creating the Transfer model, the sum field was subtracted from whom_from and added to whom_to Bill's model. As I understand it, this needs to be done through save (), but apparently, I did not set it up correctly. What could be the problem?
models.py
class Bill(models.Model):
title = models.CharField(max_length=100)
amount = models.DecimalField(max_digits=19, decimal_places=2,
validators=[MinValueValidator(0)], default=0)
def __str__(self):
return self.title
class Transfer(models.Model):
whom_from = models.ForeignKey(Bill, on_delete=models.CASCADE, related_name='whom_from')
whom_to = models.ForeignKey(Bill, on_delete=models.CASCADE, related_name='whom_to')
sum = models.DecimalField(max_digits=19, decimal_places=2, validators=[MinValueValidator(0)], default=0)
def save(self, *args, **kwargs):
self.whom_to.amount = self.whom_to.amount + self.sum
self.whom_from.amount = self.whom_from.amount - self.sum
super(Transfer, self).save(*args, **kwargs)
python django
python django
asked Nov 10 at 19:18
Meekey
329
asked Nov 10 at 19:18
Meekey
329
asked Nov 10 at 19:18
Meekey
329
asked Nov 10 at 19:18
Meekey
329
asked Nov 10 at 19:18
Meekey
329
329
1
You need to save whom_to and whom_from after changing their data.
– Daniel Roseman
Nov 10 at 19:26
@DanielRoseman How to do it?
– Meekey
Nov 10 at 20:18
1
Er, callself.whom_to.save().
– Daniel Roseman
Nov 10 at 20:21
@DanielRoseman thank you)
– Meekey
Nov 10 at 20:29
add a comment |
1
You need to save whom_to and whom_from after changing their data.
– Daniel Roseman
Nov 10 at 19:26
@DanielRoseman How to do it?
– Meekey
Nov 10 at 20:18
1
Er, callself.whom_to.save().
– Daniel Roseman
Nov 10 at 20:21
@DanielRoseman thank you)
– Meekey
Nov 10 at 20:29
1
1
You need to save whom_to and whom_from after changing their data.
– Daniel Roseman
Nov 10 at 19:26
You need to save whom_to and whom_from after changing their data.
– Daniel Roseman
Nov 10 at 19:26
@DanielRoseman How to do it?
– Meekey
Nov 10 at 20:18
@DanielRoseman How to do it?
– Meekey
Nov 10 at 20:18
1
1
Er, call
self.whom_to.save().– Daniel Roseman
Nov 10 at 20:21
Er, call
self.whom_to.save().– Daniel Roseman
Nov 10 at 20:21
@DanielRoseman thank you)
– Meekey
Nov 10 at 20:29
@DanielRoseman thank you)
– Meekey
Nov 10 at 20:29
add a comment |
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1
You need to save whom_to and whom_from after changing their data.
– Daniel Roseman
Nov 10 at 19:26
@DanielRoseman How to do it?
– Meekey
Nov 10 at 20:18
1
Er, call
self.whom_to.save().– Daniel Roseman
Nov 10 at 20:21
@DanielRoseman thank you)
– Meekey
Nov 10 at 20:29