UndefinedError: 'BlogInfo' is undefined #32
Description
File "d:\program files\python36\lib\site-packages\flask\app.py", line 2309, in call
return self.wsgi_app(environ, start_response)
File "d:\program files\python36\lib\site-packages\flask\app.py", line 2295, in wsgi_app
response = self.handle_exception(e)
File "d:\program files\python36\lib\site-packages\flask\app.py", line 1741, in handle_exception
reraise(exc_type, exc_value, tb)
File "d:\program files\python36\lib\site-packages\flask_compat.py", line 35, in reraise
raise value
File "d:\program files\python36\lib\site-packages\flask\app.py", line 2292, in wsgi_app
response = self.full_dispatch_request()
File "d:\program files\python36\lib\site-packages\flask\app.py", line 1815, in full_dispatch_request
rv = self.handle_user_exception(e)
File "d:\program files\python36\lib\site-packages\flask\app.py", line 1718, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "d:\program files\python36\lib\site-packages\flask_compat.py", line 35, in reraise
raise value
File "d:\program files\python36\lib\site-packages\flask\app.py", line 1813, in full_dispatch_request
rv = self.dispatch_request()
File "d:\program files\python36\lib\site-packages\flask\app.py", line 1799, in dispatch_request
return self.view_functionsrule.endpoint
File "D:\pycharmwork\Blog_mini\app\main\views.py", line 20, in index
pagination=pagination, endpoint='.index')
File "d:\program files\python36\lib\site-packages\flask\templating.py", line 135, in render_template
context, ctx.app)
File "d:\program files\python36\lib\site-packages\flask\templating.py", line 117, in _render
rv = template.render(context)
File "d:\program files\python36\lib\site-packages\jinja2\asyncsupport.py", line 76, in render
return original_render(self, *args, **kwargs)
File "d:\program files\python36\lib\site-packages\jinja2\environment.py", line 1008, in render
return self.environment.handle_exception(exc_info, True)
File "d:\program files\python36\lib\site-packages\jinja2\environment.py", line 780, in handle_exception
reraise(exc_type, exc_value, tb)
File "d:\program files\python36\lib\site-packages\jinja2_compat.py", line 37, in reraise
raise value.with_traceback(tb)
File "D:\pycharmwork\Blog_mini\app\templates\index.html", line 2, in top-level template code
{% import "_macros.html" as macros %}
File "D:\pycharmwork\Blog_mini\app\templates\base.html", line 8, in top-level template code
{% block title %}
File "D:\pycharmwork\Blog_mini\app\templates\base.html", line 9, in block "title"
{{ BlogInfo.query.first().title }}
File "d:\program files\python36\lib\site-packages\jinja2\environment.py", line 430, in getattr
return getattr(obj, attribute)
jinja2.exceptions.UndefinedError: 'BlogInfo' is undefined
请问这是什么原因，，