I have a model:
from django.contrib.postgres.fields import IntegerRangeField
class Album(models.Model):
rating = IntegerRangeField(default=0)
I want to set maximum and minimum value for default validation purpose. There is already an answer , but that validation will not run automatically.
So How to set a min and max value in the rating field ?
If your problem is only about validations then you can predefine a validator like this globally in models.py
from django.db import models
from django.core.exceptions import ValidationError
def validate_range(value):
if condition: # Your desired conditions here
raise ValidationError('%s some error message' % value)`
#And call them in your models wherever you require.
class MyModel(models.Model):
field = models.IntegerField(validators=[validate_range])If you want to use only IntegerRangeField then this might be helpful
from django.core.validators import MaxValueValidator, MinValueValidator
from django.db import models
class IntegerRangeField(models.IntegerField):
def __init__(self, verbose_name=None, name=None, min_value=None, max_value=None, **kwargs):
self.min_value, self.max_value = min_value, max_value
validators = []
if isinstance(max_value, int):
validators.append(MaxValueValidator(max_value))
if isinstance(min_value, int):
validators.append(MinValueValidator(min_value))
models.IntegerField.__init__(
self,
verbose_name,
name,
validators=validators,
**kwargs
)
def formfield(self, **kwargs):
defaults = {'min_value': self.min_value, 'max_value':self.max_value}
defaults.update(kwargs)
return super(IntegerRangeField, self).formfield(**defaults)