Fixed #736 -- Changed behavior of QueryDict items() to be more consistent, fixed mutability holes, gave MultiValueDict many more dictionary methods and added unit tests. Thanks, Kieran Holland. This is slightly backwards-incompatible if you happened to rely on the behavior of QueryDict.items(), which is highly unlikely.
git-svn-id: http://code.djangoproject.com/svn/django/trunk@1504 bcc190cf-cafb-0310-a4f2-bffc1f526a37
This commit is contained in:
Adrian Holovaty
parent
0ecdad8593
commit
991bb61242
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@ -100,13 +100,12 @@ class ChangeList(object):
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def get_search_parameters(self, request):
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# Get search parameters from the query string.
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try:
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self.req_get = request.GET
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self.page_num = int(request.GET.get(PAGE_VAR, 0))
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except ValueError:
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self.page_num = 0
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self.show_all = request.GET.has_key(ALL_VAR)
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self.is_popup = request.GET.has_key(IS_POPUP_VAR)
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self.params = dict(request.GET.copy())
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self.params = dict((k, v) for k, v in request.GET.items())
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if self.params.has_key(PAGE_VAR):
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del self.params[PAGE_VAR]
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@ -1678,7 +1678,6 @@ def manipulator_save(opts, klass, add, change, self, new_data):
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param = f.get_default()
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params[f.attname] = param
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if change:
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params[opts.pk.attname] = self.obj_key
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@ -1710,7 +1709,7 @@ def manipulator_save(opts, klass, add, change, self, new_data):
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if change and was_changed:
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self.fields_changed.append(f.verbose_name)
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expanded_data = DotExpandedDict(new_data.data)
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expanded_data = DotExpandedDict(dict(new_data))
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# Save many-to-one objects. Example: Add the Choice objects for a Poll.
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for related in opts.get_all_related_objects():
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# Create obj_list, which is a DotExpandedDict such as this:
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@ -1724,7 +1723,6 @@ def manipulator_save(opts, klass, add, change, self, new_data):
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obj_list.sort(lambda x, y: cmp(int(x[0]), int(y[0])))
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params = {}
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# For each related item...
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for _, rel_new_data in obj_list:
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@ -1769,7 +1767,6 @@ def manipulator_save(opts, klass, add, change, self, new_data):
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if param != None:
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params[f.attname] = param
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# Related links are a special case, because we have to
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# manually set the "content_type_id" and "object_id" fields.
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if opts.has_related_links and related.opts.module_name == 'relatedlinks':
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@ -1780,8 +1777,6 @@ def manipulator_save(opts, klass, add, change, self, new_data):
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# Create the related item.
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new_rel_obj = related.opts.get_model_module().Klass(**params)
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# If all the core fields were provided (non-empty), save the item.
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if all_cores_given:
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new_rel_obj.save()
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@ -1814,7 +1809,6 @@ def manipulator_save(opts, klass, add, change, self, new_data):
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new_rel_obj.delete()
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self.fields_deleted.append('%s "%s"' % (related.opts.verbose_name, old_rel_obj))
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# Save the order, if applicable.
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if change and opts.get_ordered_objects():
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order = new_data['order_'] and map(int, new_data['order_'].split(',')) or []
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@ -43,9 +43,9 @@ class MergeDict:
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class MultiValueDictKeyError(KeyError):
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pass
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class MultiValueDict:
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class MultiValueDict(dict):
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"""
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A dictionary-like class customized to deal with multiple values for the same key.
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A subclass of dictionary customized to handle multiple values for the same key.
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>>> d = MultiValueDict({'name': ['Adrian', 'Simon'], 'position': ['Developer']})
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>>> d['name']
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@ -60,35 +60,32 @@ class MultiValueDict:
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which returns a list for every key, even though most Web forms submit
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single name-value pairs.
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"""
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def __init__(self, key_to_list_mapping=None):
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self.data = key_to_list_mapping or {}
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def __repr__(self):
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return repr(self.data)
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def __init__(self, key_to_list_mapping=()):
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dict.__init__(self, key_to_list_mapping)
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def __getitem__(self, key):
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"Returns the data value for this key; raises KeyError if not found"
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if self.data.has_key(key):
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"""
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Returns the last data value for this key, or [] if it's an empty list;
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raises KeyError if not found.
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"""
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try:
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return self.data[key][-1] # in case of duplicates, use last value ([-1])
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list_ = dict.__getitem__(self, key)
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except KeyError:
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raise MultiValueDictKeyError, "Key %r not found in MultiValueDict %r" % (key, self)
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try:
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return list_[-1]
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except IndexError:
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return []
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raise MultiValueDictKeyError, "Key '%s' not found in MultiValueDict %s" % (key, self.data)
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def __setitem__(self, key, value):
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self.data[key] = [value]
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def _setitem_list(self, key, value):
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dict.__setitem__(self, key, [value])
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__setitem__ = _setitem_list
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def __len__(self):
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return len(self.data)
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def __contains__(self, key):
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return self.data.has_key(key)
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def get(self, key, default):
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def get(self, key, default=None):
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"Returns the default value if the requested data doesn't exist"
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try:
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val = self[key]
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except (KeyError, IndexError):
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except KeyError:
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return default
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if val == []:
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return default
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@ -97,47 +94,64 @@ class MultiValueDict:
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def getlist(self, key):
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"Returns an empty list if the requested data doesn't exist"
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try:
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return self.data[key]
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return dict.__getitem__(self, key)
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except KeyError:
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return []
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def setlist(self, key, list_):
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self.data[key] = list_
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dict.__setitem__(self, key, list_)
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def appendlist(self, key, item):
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def setdefault(self, key, default=None):
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if key not in self:
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self[key] = default
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return self[key]
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def setlistdefault(self, key, default_list=()):
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if key not in self:
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self.setlist(key, default_list)
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return self.getlist(key)
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def appendlist(self, key, value):
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"Appends an item to the internal list associated with key"
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try:
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self.data[key].append(item)
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except KeyError:
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self.data[key] = [item]
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def has_key(self, key):
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return self.data.has_key(key)
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self.setlistdefault(key, [])
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dict.__setitem__(self, key, self.getlist(key) + [value])
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def items(self):
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# we don't just return self.data.items() here, because we want to use
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# self.__getitem__() to access the values as *strings*, not lists
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return [(key, self[key]) for key in self.data.keys()]
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"""
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Returns a list of (key, value) pairs, where value is the last item in
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the list associated with the key.
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"""
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return [(key, self[key]) for key in self.keys()]
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def keys(self):
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return self.data.keys()
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def lists(self):
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"Returns a list of (key, list) pairs."
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return dict.items(self)
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def update(self, other_dict):
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if isinstance(other_dict, MultiValueDict):
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for key, value_list in other_dict.data.items():
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self.data.setdefault(key, []).extend(value_list)
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elif type(other_dict) == type({}):
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for key, value in other_dict.items():
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self.data.setdefault(key, []).append(value)
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else:
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raise ValueError, "MultiValueDict.update() takes either a MultiValueDict or dictionary"
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def values(self):
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"Returns a list of the last value on every key list."
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return [self[key] for key in self.keys()]
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def copy(self):
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"Returns a copy of this object"
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"Returns a copy of this object."
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import copy
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# Our custom __setitem__ must be disabled for copying machinery.
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MultiValueDict.__setitem__ = dict.__setitem__
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cp = copy.deepcopy(self)
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MultiValueDict.__setitem__ = MultiValueDict._setitem_list
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return cp
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def update(self, other_dict):
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"update() extends rather than replaces existing key lists."
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if isinstance(other_dict, MultiValueDict):
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for key, value_list in other_dict.lists():
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self.setlistdefault(key, []).extend(value_list)
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else:
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try:
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for key, value in other_dict.items():
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self.setlistdefault(key, []).append(value)
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except TypeError:
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raise ValueError, "MultiValueDict.update() takes either a MultiValueDict or dictionary"
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class DotExpandedDict(dict):
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"""
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A special dictionary constructor that takes a dictionary in which the keys
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@ -67,63 +67,62 @@ class QueryDict(MultiValueDict):
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"""A specialized MultiValueDict that takes a query string when initialized.
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This is immutable unless you create a copy of it."""
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def __init__(self, query_string):
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if not query_string:
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self.data = {}
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self._keys = []
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else:
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self.data = {}
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self._keys = []
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for name, value in parse_qsl(query_string, True): # keep_blank_values=True
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if name in self.data:
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self.data[name].append(value)
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else:
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self.data[name] = [value]
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if name not in self._keys:
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self._keys.append(name)
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MultiValueDict.__init__(self)
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self._mutable = True
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for key, value in parse_qsl(query_string, True): # keep_blank_values=True
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self.appendlist(key, value)
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self._mutable = False
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def __setitem__(self, key, value):
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def _assert_mutable(self):
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if not self._mutable:
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raise AttributeError, "This QueryDict instance is immutable"
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else:
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self.data[key] = [value]
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if not key in self._keys:
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self._keys.append(key)
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def _setitem_if_mutable(self, key, value):
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self._assert_mutable()
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MultiValueDict.__setitem__(self, key, value)
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__setitem__ = _setitem_if_mutable
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def setlist(self, key, list_):
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if not self._mutable:
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raise AttributeError, "This QueryDict instance is immutable"
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else:
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self.data[key] = list_
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if not key in self._keys:
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self._keys.append(key)
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self._assert_mutable()
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MultiValueDict.setlist(self, key, list_)
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def appendlist(self, key, value):
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self._assert_mutable()
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MultiValueDict.appendlist(self, key, value)
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def update(self, other_dict):
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self._assert_mutable()
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MultiValueDict.update(self, other_dict)
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def pop(self, key):
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self._assert_mutable()
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return MultiValueDict.pop(self, key)
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def popitem(self):
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self._assert_mutable()
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return MultiValueDict.popitem(self)
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def clear(self):
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self._assert_mutable()
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MultiValueDict.clear(self)
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def setdefault(self, *args):
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self._assert_mutable()
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return MultiValueDict.setdefault(self, *args)
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def copy(self):
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"Returns a mutable copy of this object"
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cp = MultiValueDict.copy(self)
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"Returns a mutable copy of this object."
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import copy
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# Our custom __setitem__ must be disabled for copying machinery.
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QueryDict.__setitem__ = dict.__setitem__
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cp = copy.deepcopy(self)
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QueryDict.__setitem__ = QueryDict._setitem_if_mutable
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cp._mutable = True
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return cp
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def assert_synchronized(self):
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assert(len(self._keys) == len(self.data.keys())), \
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"QueryDict data structure is out of sync: %s %s" % (str(self._keys), str(self.data))
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def items(self):
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"Respect order preserved by self._keys"
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self.assert_synchronized()
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items = []
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for key in self._keys:
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if key in self.data:
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items.append((key, self.data[key][0]))
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return items
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def keys(self):
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self.assert_synchronized()
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return self._keys
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def urlencode(self):
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output = []
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for k, list_ in self.data.items():
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for k, list_ in self.lists():
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output.extend([urlencode({k: v}) for v in list_])
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return '&'.join(output)
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@ -140,45 +140,67 @@ multiple values for the same key.
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That means you can't change attributes of ``request.POST`` and ``request.GET``
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directly.
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``QueryDict`` implements the following standard dictionary methods:
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* ``__repr__()``
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``QueryDict`` implements the all standard dictionary methods, because it's a
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subclass of dictionary. Exceptions are outlined here:
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* ``__getitem__(key)`` -- Returns the value for the given key. If the key
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has more than one value, ``__getitem__()`` returns the last value.
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* ``__setitem__(key, value)`` -- Sets the given key to ``[value]``
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(a Python list whose single element is ``value``).
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(a Python list whose single element is ``value``). Note that this, as
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other dictionary functions that have side effects, can only be called on
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an immutable ``QueryDict`` (one that was created via ``copy()``).
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* ``__contains__(key)`` -- **New in Django development version.*** Returns
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``True`` if the given key exists. This lets you do, e.g.,
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* ``__contains__(key)`` -- **New in Django development version.** Returns
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``True`` if the given key is set. This lets you do, e.g.,
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``if "foo" in request.GET``.
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* ``__len__()``
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* ``get(key, default)`` -- Uses the same logic as ``__getitem__()`` above,
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with a hook for returning a default value if the key doesn't exist.
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* ``has_key(key)``
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* ``setdefault(key, default)`` -- Just like the standard dictionary
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``setdefault()`` method, except it uses ``__setitem__`` internally.
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* ``update(other_dict)`` -- Takes either a ``QueryDict`` or standard
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dictionary. Just like the standard dictionary ``update()`` method, except
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it *appends* to the current dictionary items rather than replacing them.
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For example::
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>>> q = QueryDict('a=1')
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>>> q = q.copy() # to make it mutable
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>>> q.update({'a': '2'})
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>>> q.getlist('a')
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['1', '2']
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>>> q['a'] # returns the last
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['2']
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* ``items()`` -- Just like the standard dictionary ``items()`` method,
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except this retains the order for values of duplicate keys, if any. For
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example, if the original query string was ``"a=1&b=2&b=3"``, ``items()``
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will return ``[("a", ["1"]), ("b", ["2", "3"])]``, where the order of
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``["2", "3"]`` is guaranteed, but the order of ``a`` vs. ``b`` isn't.
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except this uses the same last-value logic as ``__getitem()__``. For
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example::
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* ``keys()``
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>>> q = QueryDict('a=1&a=2&a=3')
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>>> q.items()
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[('a', '3')]
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* ``update(other_dict)``
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* ``values()`` -- Just like the standard dictionary ``values()`` method,
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except this uses the same last-value logic as ``__getitem()__``. For
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example::
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In addition, it has the following methods:
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>>> q = QueryDict('a=1&a=2&a=3')
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>>> q.values()
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['3']
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In addition, ``QueryDict`` has the following methods:
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* ``copy()`` -- Returns a copy of the object, using ``copy.deepcopy()``
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from the Python standard library. The copy will be mutable -- that is,
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you can change its values.
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* ``getlist(key)`` -- Returns the data with the requested key, as a Python
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list. Returns an empty list if the key doesn't exist.
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list. Returns an empty list if the key doesn't exist. It's guaranteed to
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return a list of some sort.
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* ``setlist(key, list_)`` -- Sets the given key to ``list_`` (unlike
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``__setitem__()``).
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@ -186,6 +208,16 @@ In addition, it has the following methods:
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* ``appendlist(key, item)`` -- Appends an item to the internal list
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associated with key.
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* ``setlistdefault(key, default_list)`` -- Just like ``setdefault``, except
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it takes a list of values instead of a single value.
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* ``lists()`` -- Like ``items()``, except it includes all values, as a list,
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for each member of the dictionary. For example::
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>>> q = QueryDict('a=1&a=2&a=3')
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>>> q.lists()
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[('a', ['1', '2', '3'])]
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* ``urlencode()`` -- Returns a string of the data in query-string format.
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Example: ``"a=2&b=3&b=5"``.
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|
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@ -0,0 +1,358 @@
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"""
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###################
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# Empty QueryDict #
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###################
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>>> q = QueryDict('')
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>>> q['foo']
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Traceback (most recent call last):
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...
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MultiValueDictKeyError: "Key 'foo' not found in MultiValueDict {}"
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>>> q['something'] = 'bar'
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Traceback (most recent call last):
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...
|
||||
AttributeError: This QueryDict instance is immutable
|
||||
|
||||
>>> q.get('foo', 'default')
|
||||
'default'
|
||||
|
||||
>>> q.getlist('foo')
|
||||
[]
|
||||
|
||||
>>> q.setlist('foo', ['bar', 'baz'])
|
||||
Traceback (most recent call last):
|
||||
...
|
||||
AttributeError: This QueryDict instance is immutable
|
||||
|
||||
>>> q.appendlist('foo', ['bar'])
|
||||
Traceback (most recent call last):
|
||||
...
|
||||
AttributeError: This QueryDict instance is immutable
|
||||
|
||||
>>> q.has_key('foo')
|
||||
False
|
||||
|
||||
>>> q.items()
|
||||
[]
|
||||
|
||||
>>> q.lists()
|
||||
[]
|
||||
|
||||
>>> q.keys()
|
||||
[]
|
||||
|
||||
>>> q.values()
|
||||
[]
|
||||
|
||||
>>> len(q)
|
||||
0
|
||||
|
||||
>>> q.update({'foo': 'bar'})
|
||||
Traceback (most recent call last):
|
||||
...
|
||||
AttributeError: This QueryDict instance is immutable
|
||||
|
||||
>>> q.pop('foo')
|
||||
Traceback (most recent call last):
|
||||
...
|
||||
AttributeError: This QueryDict instance is immutable
|
||||
|
||||
>>> q.popitem()
|
||||
Traceback (most recent call last):
|
||||
...
|
||||
AttributeError: This QueryDict instance is immutable
|
||||
|
||||
>>> q.clear()
|
||||
Traceback (most recent call last):
|
||||
...
|
||||
AttributeError: This QueryDict instance is immutable
|
||||
|
||||
>>> q.setdefault('foo', 'bar')
|
||||
Traceback (most recent call last):
|
||||
...
|
||||
AttributeError: This QueryDict instance is immutable
|
||||
|
||||
>>> q.urlencode()
|
||||
''
|
||||
|
||||
###################################
|
||||
# Mutable copy of empty QueryDict #
|
||||
###################################
|
||||
|
||||
>>> q = q.copy()
|
||||
|
||||
>>> q['foo']
|
||||
Traceback (most recent call last):
|
||||
...
|
||||
MultiValueDictKeyError: "Key 'foo' not found in MultiValueDict {}"
|
||||
|
||||
>>> q['name'] = 'john'
|
||||
|
||||
>>> q['name']
|
||||
'john'
|
||||
|
||||
>>> q.get('foo', 'default')
|
||||
'default'
|
||||
|
||||
>>> q.get('name', 'default')
|
||||
'john'
|
||||
|
||||
>>> q.getlist('name')
|
||||
['john']
|
||||
|
||||
>>> q.getlist('foo')
|
||||
[]
|
||||
|
||||
>>> q.setlist('foo', ['bar', 'baz'])
|
||||
|
||||
>>> q.get('foo', 'default')
|
||||
'baz'
|
||||
|
||||
>>> q.getlist('foo')
|
||||
['bar', 'baz']
|
||||
|
||||
>>> q.appendlist('foo', 'another')
|
||||
|
||||
>>> q.getlist('foo')
|
||||
['bar', 'baz', 'another']
|
||||
|
||||
>>> q['foo']
|
||||
'another'
|
||||
|
||||
>>> q.has_key('foo')
|
||||
True
|
||||
|
||||
>>> q.items()
|
||||
[('foo', 'another'), ('name', 'john')]
|
||||
|
||||
>>> q.lists()
|
||||
[('foo', ['bar', 'baz', 'another']), ('name', ['john'])]
|
||||
|
||||
>>> q.keys()
|
||||
['foo', 'name']
|
||||
|
||||
>>> q.values()
|
||||
['another', 'john']
|
||||
|
||||
>>> len(q)
|
||||
2
|
||||
|
||||
>>> q.update({'foo': 'hello'})
|
||||
|
||||
# Displays last value
|
||||
>>> q['foo']
|
||||
'hello'
|
||||
|
||||
>>> q.get('foo', 'not available')
|
||||
'hello'
|
||||
|
||||
>>> q.getlist('foo')
|
||||
['bar', 'baz', 'another', 'hello']
|
||||
|
||||
>>> q.pop('foo')
|
||||
['bar', 'baz', 'another', 'hello']
|
||||
|
||||
>>> q.get('foo', 'not there')
|
||||
'not there'
|
||||
|
||||
>>> q.setdefault('foo', 'bar')
|
||||
'bar'
|
||||
|
||||
>>> q['foo']
|
||||
'bar'
|
||||
|
||||
>>> q.getlist('foo')
|
||||
['bar']
|
||||
|
||||
>>> q.urlencode()
|
||||
'foo=bar&name=john'
|
||||
|
||||
>>> q.clear()
|
||||
|
||||
>>> len(q)
|
||||
0
|
||||
|
||||
#####################################
|
||||
# QueryDict with one key/value pair #
|
||||
#####################################
|
||||
|
||||
>>> q = QueryDict('foo=bar')
|
||||
|
||||
>>> q['foo']
|
||||
'bar'
|
||||
|
||||
>>> q['bar']
|
||||
Traceback (most recent call last):
|
||||
...
|
||||
MultiValueDictKeyError: "Key 'bar' not found in MultiValueDict {'foo': ['bar']}"
|
||||
|
||||
>>> q['something'] = 'bar'
|
||||
Traceback (most recent call last):
|
||||
...
|
||||
AttributeError: This QueryDict instance is immutable
|
||||
|
||||
>>> q.get('foo', 'default')
|
||||
'bar'
|
||||
|
||||
>>> q.get('bar', 'default')
|
||||
'default'
|
||||
|
||||
>>> q.getlist('foo')
|
||||
['bar']
|
||||
|
||||
>>> q.getlist('bar')
|
||||
[]
|
||||
|
||||
>>> q.setlist('foo', ['bar', 'baz'])
|
||||
Traceback (most recent call last):
|
||||
...
|
||||
AttributeError: This QueryDict instance is immutable
|
||||
|
||||
>>> q.appendlist('foo', ['bar'])
|
||||
Traceback (most recent call last):
|
||||
...
|
||||
AttributeError: This QueryDict instance is immutable
|
||||
|
||||
>>> q.has_key('foo')
|
||||
True
|
||||
|
||||
>>> q.has_key('bar')
|
||||
False
|
||||
|
||||
>>> q.items()
|
||||
[('foo', 'bar')]
|
||||
|
||||
>>> q.lists()
|
||||
[('foo', ['bar'])]
|
||||
|
||||
>>> q.keys()
|
||||
['foo']
|
||||
|
||||
>>> q.values()
|
||||
['bar']
|
||||
|
||||
>>> len(q)
|
||||
1
|
||||
|
||||
>>> q.update({'foo': 'bar'})
|
||||
Traceback (most recent call last):
|
||||
...
|
||||
AttributeError: This QueryDict instance is immutable
|
||||
|
||||
>>> q.pop('foo')
|
||||
Traceback (most recent call last):
|
||||
...
|
||||
AttributeError: This QueryDict instance is immutable
|
||||
|
||||
>>> q.popitem()
|
||||
Traceback (most recent call last):
|
||||
...
|
||||
AttributeError: This QueryDict instance is immutable
|
||||
|
||||
>>> q.clear()
|
||||
Traceback (most recent call last):
|
||||
...
|
||||
AttributeError: This QueryDict instance is immutable
|
||||
|
||||
>>> q.setdefault('foo', 'bar')
|
||||
Traceback (most recent call last):
|
||||
...
|
||||
AttributeError: This QueryDict instance is immutable
|
||||
|
||||
>>> q.urlencode()
|
||||
'foo=bar'
|
||||
|
||||
#####################################################
|
||||
# QueryDict with two key/value pairs with same keys #
|
||||
#####################################################
|
||||
|
||||
>>> q = QueryDict('vote=yes&vote=no')
|
||||
|
||||
>>> q['vote']
|
||||
'no'
|
||||
|
||||
>>> q['something'] = 'bar'
|
||||
Traceback (most recent call last):
|
||||
...
|
||||
AttributeError: This QueryDict instance is immutable
|
||||
|
||||
>>> q.get('vote', 'default')
|
||||
'no'
|
||||
|
||||
>>> q.get('foo', 'default')
|
||||
'default'
|
||||
|
||||
>>> q.getlist('vote')
|
||||
['yes', 'no']
|
||||
|
||||
>>> q.getlist('foo')
|
||||
[]
|
||||
|
||||
>>> q.setlist('foo', ['bar', 'baz'])
|
||||
Traceback (most recent call last):
|
||||
...
|
||||
AttributeError: This QueryDict instance is immutable
|
||||
|
||||
>>> q.appendlist('foo', ['bar'])
|
||||
Traceback (most recent call last):
|
||||
...
|
||||
AttributeError: This QueryDict instance is immutable
|
||||
|
||||
>>> q.has_key('vote')
|
||||
True
|
||||
|
||||
>>> q.has_key('foo')
|
||||
False
|
||||
|
||||
>>> q.items()
|
||||
[('vote', 'no')]
|
||||
|
||||
>>> q.lists()
|
||||
[('vote', ['yes', 'no'])]
|
||||
|
||||
>>> q.keys()
|
||||
['vote']
|
||||
|
||||
>>> q.values()
|
||||
['no']
|
||||
|
||||
>>> len(q)
|
||||
1
|
||||
|
||||
>>> q.update({'foo': 'bar'})
|
||||
Traceback (most recent call last):
|
||||
...
|
||||
AttributeError: This QueryDict instance is immutable
|
||||
|
||||
>>> q.pop('foo')
|
||||
Traceback (most recent call last):
|
||||
...
|
||||
AttributeError: This QueryDict instance is immutable
|
||||
|
||||
>>> q.popitem()
|
||||
Traceback (most recent call last):
|
||||
...
|
||||
AttributeError: This QueryDict instance is immutable
|
||||
|
||||
>>> q.clear()
|
||||
Traceback (most recent call last):
|
||||
...
|
||||
AttributeError: This QueryDict instance is immutable
|
||||
|
||||
>>> q.setdefault('foo', 'bar')
|
||||
Traceback (most recent call last):
|
||||
...
|
||||
AttributeError: This QueryDict instance is immutable
|
||||
|
||||
>>> q.urlencode()
|
||||
'vote=yes&vote=no'
|
||||
|
||||
"""
|
||||
|
||||
from django.utils.httpwrappers import QueryDict
|
||||
|
||||
if __name__ == "__main__":
|
||||
import doctest
|
||||
doctest.testmod()
|
||||
Loading…
Reference in New Issue