「タグ」オブジェクトに属性「カウント」がないという開発サーバーにアクセスすると、このエラーが発生し続けます。前のコード行で使用されたときに tag.count がエラーを生成しなかったときに、117 行目でエラーが発生する理由がわかりません。ありがとう!
エラーメッセージは次のとおりです。
AttributeError at /tag/
'Tag' object has no attribute 'count'
Request Method: GET
Request URL:
http://127.0.0.1:8000/tag/
Django Version: 1.4
Exception Type: AttributeError
Exception Value:
'Tag' object has no attribute 'count'
Exception Location: /Users/jonathanschen/Python/projects/skeleton/django_bookmarks/django_bookmarks/bookmarks/views.py in tag_cloud_page, line 117
Python Executable: /usr/bin/python
Python Version: 2.7.1
Python Path:
['/Users/jonathanschen/Python/projects/skeleton/django_bookmarks',
'/Library/Python/2.7/site-packages/pip-1.1-py2.7.egg',
'/Library/Python/2.7/site-packages/distribute-0.6.27-py2.7.egg',
'/Library/Python/2.7/site-packages/nose-1.1.2-py2.7.egg',
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python27.zip',
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7',
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-darwin',
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac',
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac/lib-scriptpackages',
'/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python',
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk',
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-old',
'/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload',
'/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/PyObjC',
'/Library/Python/2.7/site-packages',
'/Library/Python/2.7/site-packages/setuptools-0.6c11-py2.7.egg-info']
Server time: Mon, 9 Jul 2012 11:35:33 -0500
それが参照するコードは次のとおりです。
def tag_cloud_page(request):
MAX_WEIGHT = 5
tags = Tag.objects.order_by('name')
# Calculate tag min and max counts
min_count = max_count = tags[0].bookmarks.count()
for tag in tags:
tag.count = tag.bookmarks.count()
if tag.count < min_count:
min_count = tag.count
if max_count < tag.count:
max_count = tag.count
#calculate count range. Avoid dividing by zero.
range = float(max_count - min_count)
if range == 0.0:
range = 1.0
# Calculate tag weights.
for tag in tags:
tag.weight = int(
MAX_WEIGHT * (tag.count - min_count) / range #line 117
)
variables = RequestContext(request, {
'tags': tags
})
return render_to_response('tag_cloud_page.html', variables)