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Comma Separated Values Form Field for Django. There are CommaSeparatedCharField, CommaSeparatedIntegerField.
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| 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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