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@marceloleiva

marceloleiva/forms.py

Forked from eerien/forms.py
Created Jul 7, 2019
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Comma Separated Values Form Field for Django. There are CommaSeparatedCharField, CommaSeparatedIntegerField.
from django import forms
from django.core import validators
from django.core.exceptions import ValidationError
class MinLengthValidator(validators.MinLengthValidator):
message = 'Ensure this value has at least %(limit_value)d elements (it has %(show_value)d).'
class MaxLengthValidator(validators.MaxLengthValidator):
message = 'Ensure this value has at most %(limit_value)d elements (it has %(show_value)d).'
class CommaSeparatedCharField(forms.Field):
def __init__(self, dedup=True, max_length=None, min_length=None, *args, **kwargs):
self.dedup, self.max_length, self.min_length = dedup, max_length, min_length
super(CommaSeparatedCharField, self).__init__(*args, **kwargs)
if min_length is not None:
self.validators.append(MinLengthValidator(min_length))
if max_length is not None:
self.validators.append(MaxLengthValidator(max_length))
def to_python(self, value):
if value in validators.EMPTY_VALUES:
return []
value = [item.strip() for item in value.split(',') if item.strip()]
if self.dedup:
value = list(set(value))
return value
def clean(self, value):
value = self.to_python(value)
self.validate(value)
self.run_validators(value)
return value
class CommaSeparatedIntegerField(forms.Field):
default_error_messages = {
'invalid': 'Enter comma separated numbers only.',
}
def __init__(self, dedup=True, max_length=None, min_length=None, *args, **kwargs):
self.dedup, self.max_length, self.min_length = dedup, max_length, min_length
super(CommaSeparatedIntegerField, self).__init__(*args, **kwargs)
if min_length is not None:
self.validators.append(MinLengthValidator(min_length))
if max_length is not None:
self.validators.append(MaxLengthValidator(max_length))
def to_python(self, value):
if value in validators.EMPTY_VALUES:
return []
try:
value = [int(item.strip()) for item in value.split(',') if item.strip()]
if self.dedup:
value = list(set(value))
except (ValueError, TypeError):
raise ValidationError(self.error_messages['invalid'])
return value
def clean(self, value):
value = self.to_python(value)
self.validate(value)
self.run_validators(value)
return value
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