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Fixed #3826: added a {% with %}. Thanks, SmileyChris.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@4830 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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commit d6fd9fb22bdbc6939fbe97c6e0571b8002d014c6 1 parent 750ea55
@jacobian jacobian authored
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37 django/template/defaulttags.py
@@ -354,6 +354,23 @@ def render(self, context):
return ''
return str(int(round(ratio)))
+class WithNode(Node):
+ def __init__(self, var, name, nodelist):
+ self.var = var
+ self.name = name
+ self.nodelist = nodelist
+
+ def __repr__(self):
+ return "<WithNode>"
+
+ def render(self, context):
+ val = self.var.resolve(context)
+ context.push()
+ context[self.name] = val
+ output = self.nodelist.render(context)
+ context.pop()
+ return output
+
#@register.tag
def comment(parser, token):
"""
@@ -967,3 +984,23 @@ def widthratio(parser, token):
return WidthRatioNode(parser.compile_filter(this_value_expr),
parser.compile_filter(max_value_expr), max_width)
widthratio = register.tag(widthratio)
+
+#@register.tag
+def do_with(parser, token):
+ """
+ Add a value to the context (inside of this block) for caching and easy
+ access. For example::
+
+ {% with person.some_sql_method as total %}
+ {{ total }} object{{ total|pluralize }}
+ {% endwith %}
+ """
+ bits = list(token.split_contents())
+ if len(bits) != 4 or bits[2] != "as":
+ raise TemplateSyntaxError, "%r expected format is 'value as name'" % tagname
+ var = parser.compile_filter(bits[1])
+ name = bits[3]
+ nodelist = parser.parse(('endwith',))
+ parser.delete_first_token()
+ return WithNode(var, name, nodelist)
+do_with = register.tag('with', do_with)
View
16 docs/templates.txt
@@ -872,6 +872,22 @@ Above, if ``this_value`` is 175 and ``max_value`` is 200, the the image in the
above example will be 88 pixels wide (because 175/200 = .875; .875 * 100 = 87.5
which is rounded up to 88).
+with
+~~~~
+
+**New in Django development version**
+
+Useful for caching a method which will be used more than once.
+
+For example::
+
+ {% with person.some_sql_method as total %}
+ {{ total }} person object{{ total|pluralize }}
+ {% endwith %}
+
+The populated variable (in the example above, ``total``) is only available
+inside of ``{% with %}`` block.
+
Built-in filter reference
-------------------------
View
4 tests/regressiontests/templates/tests.py
@@ -650,6 +650,10 @@ def test_templates(self):
'widthratio09': ('{% widthratio a b %}', {'a':50,'b':100}, template.TemplateSyntaxError),
'widthratio10': ('{% widthratio a b 100.0 %}', {'a':50,'b':100}, template.TemplateSyntaxError),
+ ### WITH TAG ########################################################
+ 'with01': ('{% with dict.key as key %}{{ key }}{% endwith %}', {'dict': {'key':50}}, '50'),
+ 'with02': ('{{ key }}{% with dict.key as key %}{{ key }}-{{ dict.key }}-{{ key }}{% endwith %}{{ key }}', {'dict': {'key':50}}, ('50-50-50', 'INVALID50-50-50INVALID')),
+
### NOW TAG ########################################################
# Simple case
'now01' : ('{% now "j n Y"%}', {}, str(datetime.now().day) + ' ' + str(datetime.now().month) + ' ' + str(datetime.now().year)),
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