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import copy
from django import forms
from django.contrib.postgres.validators import (
ArrayMaxLengthValidator, ArrayMinLengthValidator,
)
from django.core.exceptions import ValidationError
from django.utils import six
from django.utils.safestring import mark_safe
from django.utils.translation import string_concat, ugettext_lazy as _
class SimpleArrayField(forms.CharField):
default_error_messages = {
'item_invalid': _('Item %(nth)s in the array did not validate: '),
}
def __init__(self, base_field, delimiter=',', max_length=None, min_length=None, *args, **kwargs):
self.base_field = base_field
self.delimiter = delimiter
super(SimpleArrayField, self).__init__(*args, **kwargs)
if min_length is not None:
self.min_length = min_length
self.validators.append(ArrayMinLengthValidator(int(min_length)))
if max_length is not None:
self.max_length = max_length
self.validators.append(ArrayMaxLengthValidator(int(max_length)))
def prepare_value(self, value):
if isinstance(value, list):
return self.delimiter.join(six.text_type(self.base_field.prepare_value(v)) for v in value)
return value
def to_python(self, value):
if value:
items = value.split(self.delimiter)
else:
items = []
errors = []
values = []
for i, item in enumerate(items):
try:
values.append(self.base_field.to_python(item))
except ValidationError as e:
for error in e.error_list:
errors.append(ValidationError(
string_concat(self.error_messages['item_invalid'], error.message),
code='item_invalid',
params={'nth': i},
))
if errors:
raise ValidationError(errors)
return values
def validate(self, value):
super(SimpleArrayField, self).validate(value)
errors = []
for i, item in enumerate(value):
try:
self.base_field.validate(item)
except ValidationError as e:
for error in e.error_list:
errors.append(ValidationError(
string_concat(self.error_messages['item_invalid'], error.message),
code='item_invalid',
params={'nth': i},
))
if errors:
raise ValidationError(errors)
def run_validators(self, value):
super(SimpleArrayField, self).run_validators(value)
errors = []
for i, item in enumerate(value):
try:
self.base_field.run_validators(item)
except ValidationError as e:
for error in e.error_list:
errors.append(ValidationError(
string_concat(self.error_messages['item_invalid'], error.message),
code='item_invalid',
params={'nth': i},
))
if errors:
raise ValidationError(errors)
class SplitArrayWidget(forms.Widget):
def __init__(self, widget, size, **kwargs):
self.widget = widget() if isinstance(widget, type) else widget
self.size = size
super(SplitArrayWidget, self).__init__(**kwargs)
@property
def is_hidden(self):
return self.widget.is_hidden
def value_from_datadict(self, data, files, name):
return [self.widget.value_from_datadict(data, files, '%s_%s' % (name, index))
for index in range(self.size)]
def id_for_label(self, id_):
# See the comment for RadioSelect.id_for_label()
if id_:
id_ += '_0'
return id_
def render(self, name, value, attrs=None):
if self.is_localized:
self.widget.is_localized = self.is_localized
value = value or []
output = []
final_attrs = self.build_attrs(attrs)
id_ = final_attrs.get('id')
for i in range(max(len(value), self.size)):
try:
widget_value = value[i]
except IndexError:
widget_value = None
if id_:
final_attrs = dict(final_attrs, id='%s_%s' % (id_, i))
output.append(self.widget.render(name + '_%s' % i, widget_value, final_attrs))
return mark_safe(self.format_output(output))
def format_output(self, rendered_widgets):
return ''.join(rendered_widgets)
@property
def media(self):
return self.widget.media
def __deepcopy__(self, memo):
obj = super(SplitArrayWidget, self).__deepcopy__(memo)
obj.widget = copy.deepcopy(self.widget)
return obj
@property
def needs_multipart_form(self):
return self.widget.needs_multipart_form
class SplitArrayField(forms.Field):
default_error_messages = {
'item_invalid': _('Item %(nth)s in the array did not validate: '),
}
def __init__(self, base_field, size, remove_trailing_nulls=False, **kwargs):
self.base_field = base_field
self.size = size
self.remove_trailing_nulls = remove_trailing_nulls
widget = SplitArrayWidget(widget=base_field.widget, size=size)
kwargs.setdefault('widget', widget)
super(SplitArrayField, self).__init__(**kwargs)
def clean(self, value):
cleaned_data = []
errors = []
if not any(value) and self.required:
raise ValidationError(self.error_messages['required'])
max_size = max(self.size, len(value))
for i in range(max_size):
item = value[i]
try:
cleaned_data.append(self.base_field.clean(item))
errors.append(None)
except ValidationError as error:
errors.append(ValidationError(
string_concat(self.error_messages['item_invalid'], ' '.join(error.messages)),
code='item_invalid',
params={'nth': i},
))
cleaned_data.append(None)
if self.remove_trailing_nulls:
null_index = None
for i, value in reversed(list(enumerate(cleaned_data))):
if value in self.base_field.empty_values:
null_index = i
else:
break
if null_index:
cleaned_data = cleaned_data[:null_index]
errors = errors[:null_index]
errors = list(filter(None, errors))
if errors:
raise ValidationError(errors)
return cleaned_data
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