Use key().name() instead of link_id
This is now possible because key_name is constructed purely from the
key fields of an entity. It is not sufficient to use just link_id,
that works only for single-scoped entities (e.g., those that either
do not have a scope, or that have a scope which itself does not have
a scope). It would break if there was an entity that has a scoped
scope (it would only include the scope's link_id in the url, which
made it impossible to look up the scope as we missed the link_id of
the scope's scope).
Patch by: Sverre Rabbelier
#!/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.
"""Logic related to handling dictionaries.
"""
__authors__ = [
'"Sverre Rabbelier" <sverre@rabbelier.nl>',
'"Lennard de Rijk" <ljvderijk@gmail.com>',
]
def filter(target, keys):
"""Filters a dictonary to only allow items with the given keys.
Args:
target: The dictionary that is to be filtered
keys: The list with keys to filter the dictionary on
Returns:
A dictionary that only contains the (key,value) from target that
have their key in keys.
"""
result = {}
for key, value in target.iteritems():
if key in keys:
result[key] = value
return result
def merge(target, updates):
"""Like the builtin 'update' method but does not overwrite existing values.
Args:
target: The dictionary that is to be updated, may be None
updates: A dictionary containing new values for the original dict
Returns:
the target dict, with any missing values from updates merged in, in-place.
"""
if not target:
target = {}
for key, value in updates.iteritems():
if key not in target:
target[key] = value
return target
def zip(keys, values):
"""Returns a dict containing keys with values.
If there are more items in keys than in values, None will be used.
If there are more items in values than in keys, they will be ignored.
Args:
keys: the keys for the dictionary
values: the values for the dictionary
"""
result = {}
size = len(keys)
for i in range(size):
if i < len(values):
value = values[i]
else:
value = None
key = keys[i]
result[key] = value
return result
def rename(target, keys):
"""Returns a dict containing only the key/value pairs from keys.
The keys from target will be looked up in keys, and the corresponding
value from keys will be used instead. If a key is not found, it is skipped.
Args:
target: the dictionary to filter
keys: the fields to filter
"""
result = {}
for key, value in target.iteritems():
if key in keys:
new_key = keys[key]
result[new_key] = value
return result