My class looks like this:
class Foo(models.Model):
known_by = JSONField()
My data looks like this
{ "known_by" : [
{'by':'name1', 'value':['def']},
{'by':'name2', 'value':['bar']}
]
}
Is there any way for me to enforce that the Jsonfield needs to follow the format of by,value[] dict. I know how to do this using serialiazers
Any other cleaner way to enforce this(in the model definition itself)? Thanks
You can add a validator to the model field, like this:
class Foo(models.Model):
known_by = ArrayField(JSONField(max_length=100), size=4, validators=[a_json_array_validator])
And the validator is:
def a_json_array_validator(value):
if any([not is_json_valid(entry) for entry in value]):
raise ValidationError(
_('%(value) is not a valid json'),
params={'value': value},
)
(The actual json validation is up to you) ;-) Note that validators receive python objects so its actually a dict.
You could implement it this way:
from django.db import models
class Bar(models.Model):
by = models.CharField()
value = models.ArrayField()
class Foo(models.Model):
known_by = models.ForeignKey(Bar, on_delete=models.CASCADE)
Why not just override the save method to do the enforcement?
class Foo(models.Model):
known_by = JSONField()
def save(self, *args, **kwargs):
# begin validation code
# end validation code
if valid:
super(Model, self).save(*args, **kwargs)
else:
# something else, maybe http error code?