Fixed #5567 -- Added a "last" filter. Based on a patch from darkpixel.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@6998 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/template/defaultfilters.py

@@ -449,6 +449,14 @@ def join(value, arg):
         return data
 join.is_safe = True
 
+def last(value):
+    "Returns the last item in a list"
+    try:
+        return value[-1]
+    except IndexError:
+        return u''
+last.is_safe = True
+
 def length(value):
     """Returns the length of the value - useful for lists."""
     return len(value)
@@ -800,6 +808,7 @@ register.filter(force_escape)
 register.filter(get_digit)
 register.filter(iriencode)
 register.filter(join)
+register.filter(last)
 register.filter(length)
 register.filter(length_is)
 register.filter(linebreaks)

docs/templates.txt

@@ -1403,6 +1403,11 @@ join
 
 Joins a list with a string, like Python's ``str.join(list)``.
 
+last
+~~~~
+
+Returns the last item in a list.
+
 length
 ~~~~~~
 

tests/regressiontests/templates/filters.py

@@ -179,6 +179,9 @@ def get_filter_tests():
         'filter-first01': ('{{ a|first }} {{ b|first }}', {"a": ["a&b", "x"], "b": [mark_safe("a&b"), "x"]}, "a&b a&b"),
         'filter-first02': ('{% autoescape off %}{{ a|first }} {{ b|first }}{% endautoescape %}', {"a": ["a&b", "x"], "b": [mark_safe("a&b"), "x"]}, "a&b a&b"),
 
+        'filter-last01': ('{{ a|last }} {{ b|last }}', {"a": ["x", "a&b"], "b": ["x", mark_safe("a&b")]}, "a&b a&b"),
+        'filter-last02': ('{% autoescape off %}{{ a|last }} {{ b|last }}{% endautoescape %}', {"a": ["x", "a&b"], "b": ["x", mark_safe("a&b")]}, "a&b a&b"),
+
         'filter-random01': ('{{ a|random }} {{ b|random }}', {"a": ["a&b", "a&b"], "b": [mark_safe("a&b"), mark_safe("a&b")]}, "a&b a&b"),
         'filter-random02': ('{% autoescape off %}{{ a|random }} {{ b|random }}{% endautoescape %}', {"a": ["a&b", "a&b"], "b": [mark_safe("a&b"), mark_safe("a&b")]}, "a&b a&b"),