Viewing file:  utils.py (5.86 KB) -rw-r--r--
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import json
from collections import UserList
from django.conf import settings
from django.core.exceptions import ValidationError
from django.utils import timezone
from django.utils.html import escape, format_html, format_html_join, html_safe
from django.utils.translation import gettext_lazy as _
def pretty_name(name):
"""Convert 'first_name' to 'First name'."""
if not name:
return ''
return name.replace('_', ' ').capitalize()
def flatatt(attrs):
"""
Convert a dictionary of attributes to a single string.
The returned string will contain a leading space followed by key="value",
XML-style pairs. In the case of a boolean value, the key will appear
without a value. It is assumed that the keys do not need to be
XML-escaped. If the passed dictionary is empty, then return an empty
string.
The result is passed through 'mark_safe' (by way of 'format_html_join').
"""
key_value_attrs = []
boolean_attrs = []
for attr, value in attrs.items():
if isinstance(value, bool):
if value:
boolean_attrs.append((attr,))
elif value is not None:
key_value_attrs.append((attr, value))
return (
format_html_join('', ' {}="{}"', sorted(key_value_attrs)) +
format_html_join('', ' {}', sorted(boolean_attrs))
)
@html_safe
class ErrorDict(dict):
"""
A collection of errors that knows how to display itself in various formats.
The dictionary keys are the field names, and the values are the errors.
"""
def as_data(self):
return {f: e.as_data() for f, e in self.items()}
def get_json_data(self, escape_html=False):
return {f: e.get_json_data(escape_html) for f, e in self.items()}
def as_json(self, escape_html=False):
return json.dumps(self.get_json_data(escape_html))
def as_ul(self):
if not self:
return ''
return format_html(
'<ul class="errorlist">{}</ul>',
format_html_join('', '<li>{}{}</li>', self.items())
)
def as_text(self):
output = []
for field, errors in self.items():
output.append('* %s' % field)
output.append('\n'.join(' * %s' % e for e in errors))
return '\n'.join(output)
def __str__(self):
return self.as_ul()
@html_safe
class ErrorList(UserList, list):
"""
A collection of errors that knows how to display itself in various formats.
"""
def __init__(self, initlist=None, error_class=None):
super().__init__(initlist)
if error_class is None:
self.error_class = 'errorlist'
else:
self.error_class = 'errorlist {}'.format(error_class)
def as_data(self):
return ValidationError(self.data).error_list
def copy(self):
copy = super().copy()
copy.error_class = self.error_class
return copy
def get_json_data(self, escape_html=False):
errors = []
for error in self.as_data():
message = next(iter(error))
errors.append({
'message': escape(message) if escape_html else message,
'code': error.code or '',
})
return errors
def as_json(self, escape_html=False):
return json.dumps(self.get_json_data(escape_html))
def as_ul(self):
if not self.data:
return ''
return format_html(
'<ul class="{}">{}</ul>',
self.error_class,
format_html_join('', '<li>{}</li>', ((e,) for e in self))
)
def as_text(self):
return '\n'.join('* %s' % e for e in self)
def __str__(self):
return self.as_ul()
def __repr__(self):
return repr(list(self))
def __contains__(self, item):
return item in list(self)
def __eq__(self, other):
return list(self) == other
def __getitem__(self, i):
error = self.data[i]
if isinstance(error, ValidationError):
return next(iter(error))
return error
def __reduce_ex__(self, *args, **kwargs):
# The `list` reduce function returns an iterator as the fourth element
# that is normally used for repopulating. Since we only inherit from
# `list` for `isinstance` backward compatibility (Refs #17413) we
# nullify this iterator as it would otherwise result in duplicate
# entries. (Refs #23594)
info = super(UserList, self).__reduce_ex__(*args, **kwargs)
return info[:3] + (None, None)
# Utilities for time zone support in DateTimeField et al.
def from_current_timezone(value):
"""
When time zone support is enabled, convert naive datetimes
entered in the current time zone to aware datetimes.
"""
if settings.USE_TZ and value is not None and timezone.is_naive(value):
current_timezone = timezone.get_current_timezone()
try:
if (
not timezone._is_pytz_zone(current_timezone) and
timezone._datetime_ambiguous_or_imaginary(value, current_timezone)
):
raise ValueError('Ambiguous or non-existent time.')
return timezone.make_aware(value, current_timezone)
except Exception as exc:
raise ValidationError(
_('%(datetime)s couldn’t be interpreted '
'in time zone %(current_timezone)s; it '
'may be ambiguous or it may not exist.'),
code='ambiguous_timezone',
params={'datetime': value, 'current_timezone': current_timezone}
) from exc
return value
def to_current_timezone(value):
"""
When time zone support is enabled, convert aware datetimes
to naive datetimes in the current time zone for display.
"""
if settings.USE_TZ and value is not None and timezone.is_aware(value):
return timezone.make_naive(value)
return value
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