from django.utils.html import conditional_escape from django.utils.encoding import smart_unicode, StrAndUnicode, force_unicode from django.utils.safestring import mark_safe 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. It is assumed that the keys do not need to be XML-escaped. If the passed dictionary is empty, then return an empty string. """ return u''.join([u' %s="%s"' % (k, conditional_escape(v)) for k, v in attrs.items()]) class ErrorDict(dict, StrAndUnicode): """ 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 __unicode__(self): return self.as_ul() def as_ul(self): if not self: return u'' return mark_safe(u'' % ''.join([u'
  • %s%s
  • ' % (k, force_unicode(v)) for k, v in self.items()])) def as_text(self): return u'\n'.join([u'* %s\n%s' % (k, u'\n'.join([u' * %s' % force_unicode(i) for i in v])) for k, v in self.items()]) class ErrorList(list, StrAndUnicode): """ A collection of errors that knows how to display itself in various formats. """ def __unicode__(self): return self.as_ul() def as_ul(self): if not self: return u'' return mark_safe(u'' % ''.join([u'
  • %s
  • ' % force_unicode(e) for e in self])) def as_text(self): if not self: return u'' return u'\n'.join([u'* %s' % force_unicode(e) for e in self]) def __repr__(self): return repr([force_unicode(e) for e in self]) class ValidationError(Exception): def __init__(self, message): """ ValidationError can be passed any object that can be printed (usually a string) or a list of objects. """ if isinstance(message, list): self.messages = ErrorList([smart_unicode(msg) for msg in message]) else: message = smart_unicode(message) self.messages = ErrorList([message]) def __str__(self): # This is needed because, without a __str__(), printing an exception # instance would result in this: # AttributeError: ValidationError instance has no attribute 'args' # See http://www.python.org/doc/current/tut/node10.html#handling return repr(self.messages)