Added getSingleIndexedParamValue() that retrieves an index into a list of
values from the named query parameter, and then indexes into the supplied list
of values to return the corresponding value from the list. Used to convert
numeric index query parameters passed by POST to the GET redirect target, so
that the GET code can display messages, etc. (without passing the message
itself as a query argument and having to escape it or have silly people pass
in their own...).
#!/usr/bin/python2.5
#
# Copyright 2008 the Melange authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
"""Helpers used to display various views that are forms.
"""
__authors__ = [
'"Todd Larsen" <tlarsen@google.com>',
]
from google.appengine.ext.db import djangoforms
class DbModelForm(djangoforms.ModelForm):
"""Subclass of Django ModelForm that fixes some label and help_text issues.
The default behavior of ModelForm is to use the verbose_name in all
lowercase, capitalizing only the first character, as the displayed field
label. This class uses verbose_name unaltered as the visible field label
instead.
The Property classes used by the App Engine Datastore do not have a
help_text parameter to their constructor. In a Model class, a help_text
attribute *can* be added to the property after it is created, but the
help text will not be automatically passed along to the Django ModelForm.
This class detects the presence of a help_text attribute and adds it to
the corresponding form field object.
ugettext_lazy() proxies used for internationalization in the Model will
still work correctly with this new behavior, as long as the original
strings are used as the translation keys.
"""
def __init__(self, *args, **kwargs):
"""Fixes label and help_text issues after parent initialization.
Args:
*args, **kwargs: passed through to parent __init__() constructor
"""
super(DbModelForm, self).__init__(*args, **kwargs)
for field_name in self.fields.iterkeys():
# Since fields can be added only to the ModelForm subclass, check to
# see if the Model has a corresponding field first.
if hasattr(self.Meta.model, field_name):
model_prop = getattr(self.Meta.model, field_name)
# Check if the Model property defined verbose_name, and copy that
# verbatim to the corresponding field label.
if hasattr(model_prop, 'verbose_name'):
self.fields[field_name].label = model_prop.verbose_name
# Check if the Model property added help_text, and copy that verbatim
# to the corresponding field help_text.
if hasattr(model_prop, 'help_text'):
self.fields[field_name].help_text = model_prop.help_text