ContentNotRenderedError after a django upgrade
Here's a middleware that I use:
class StatsMiddleware(object):
def process_view(self, request, view_func, view_args, view_kwargs):
# get number of db queries before we do anything
n = len(connection.queries)
# time the view
start = time.time()
response = view_func(request, *view_args, **view_kwargs)
totTime = time.time() - start
# compute the db time for the queries just run
queries = len(connection.queries) - n
if queries:
dbTime = reduce(add, [float(q['time'])
for q in connection.queries[n:]])
else:
dbTime = 0.0
# and backout python time
pyTime = totTime - dbTime
stats = {
'totTime': totTime,
'pyTime': pyTime,
'dbTime': dbTime,
'queries': queries,
'sql': '<br />'.join([ '<div class="stats_sql_query">%s</div><div class="stats_sql_time">%s s</div>' % (q['sql'], q['time']) for q in connection.queries[n:]]),
}
# clean query cache
db.reset_queries()
# replace the comment if found
if response and response.content:
s = response.content
regexp = re.compile(r'(?P<cmt><!--s*STATS:(?P<fmt>.*?)-->)')
match = regexp.search(s)
if match:
s = s[:match.start('cmt')] +
match.group('fmt') % stats +
s[match.end('cmt'):]
response.content = s
return response
It has been working perfectly for me up to django 1.3 but this broke when I upgraded to django trunk (1.4+) today, with the exception:-
Traceback:
File "./../django-trunk/django/core/handlers/base.py" in get_response
105. response = middleware_method(request, callback, callback_args, callback_kwargs)
File "misc/middleware.py" in process_view
63. if response and response.content:
File "./../django-trunk/django/template/response.py" in _get_content
123. raise ContentNotRenderedError('The response content must be '
Exception Type: ContentNotRenderedError at /
Exception Value: The response content must be rendered before it can be accessed.
Would appreciate it if some one using django trunk points me in the right direction. Thanks!
Hacktastic解决方案：您可以通过检查响应是否具有is_rendered属性来防止这种情况发生，如果是这样，那么在更改STATS字符串之前它是真实的，如下所示：
if response:
if (hasattr(response,'is_rendered') and response.is_rendered or not hasattr(response,'is_rendered') ) and response.content:
s = response.content
regexp = re.compile(r'(?P<cmt><!--s*STATS:(?P<fmt>.*?)-->)')
match = regexp.search(s)
if match:
s = s[:match.start('cmt')] +
match.group('fmt') % stats +
s[match.end('cmt'):]
response.content = s
return response