Fixed #2779: added a copy() method to MergeDict, along with some new tests for django.utils.datastructures. Thanks, Chris McAvoy.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@4640 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/utils/datastructures.py

@@ -17,6 +17,9 @@ class MergeDict(object):
     def __contains__(self, key):
         return self.has_key(key)
         
+    def __copy__(self): 
+        return self.__class__(*self.dicts) 
+
     def get(self, key, default=None):
         try:
             return self[key]
@@ -43,6 +46,10 @@ class MergeDict(object):
                 return True
         return False
         
+    def copy(self): 
+        """ returns a copy of this object""" 
+        return self.__copy__()
+
 class SortedDict(dict):
     "A dictionary that keeps its keys in the order in which they're inserted."
     def __init__(self, data=None):

tests/regressiontests/datastructures/tests.py

@@ -0,0 +1,34 @@
+"""
+# Tests for stuff in django.utils.datastructures.
+
+>>> from django.utils.datastructures import *
+
+### MergeDict #################################################################
+
+>>> d1 = {'chris':'cool','camri':'cute','cotton':'adorable','tulip':'snuggable', 'twoofme':'firstone'}
+>>> d2 = {'chris2':'cool2','camri2':'cute2','cotton2':'adorable2','tulip2':'snuggable2'}
+>>> d3 = {'chris3':'cool3','camri3':'cute3','cotton3':'adorable3','tulip3':'snuggable3'}
+>>> d4 = {'twoofme':'secondone'}
+>>> md = MergeDict( d1,d2,d3 )
+>>> md['chris']
+'cool'
+>>> md['camri']
+'cute'
+>>> md['twoofme']
+'firstone'
+>>> md2 = md.copy()
+>>> md2['chris']
+'cool'
+
+### MultiValueDict ##########################################################
+
+>>> d = MultiValueDict({'name': ['Adrian', 'Simon'], 'position': ['Developer']})
+>>> d['name']
+'Simon'
+>>> d.getlist('name')
+['Adrian', 'Simon']
+>>> d.get('lastname', 'nonexistent')
+'nonexistent'
+>>> d.setlist('lastname', ['Holovaty', 'Willison'])
+
+"""