AttributeError: 'NoneType' object has no attribute 'date_posted'
__call__
def __call__(self, environ, start_response):
"""The WSGI server calls the Flask application object as the
WSGI application. This calls :meth:`wsgi_app` which can be
wrapped to applying middleware."""
return self.wsgi_app(environ, start_response)
def __repr__(self):
return '<%s %r>' % (
self.__class__.__name__,
self.name,
wsgi_app
try:
ctx.push()
response = self.full_dispatch_request()
except Exception as e:
error = e
response = self.handle_exception(e)
except:
error = sys.exc_info()[1]
raise
return response(environ, start_response)
finally:
handle_exception
# if we want to repropagate the exception, we can attempt to
# raise it with the whole traceback in case we can do that
# (the function was actually called from the except part)
# otherwise, we just raise the error again
if exc_value is e:
reraise(exc_type, exc_value, tb)
else:
raise e
self.log_exception((exc_type, exc_value, tb))
if handler is None:
reraise
from io import StringIO
def reraise(tp, value, tb=None):
if value.__traceback__ is not tb:
raise value.with_traceback(tb)
raise value
implements_to_string = _identity
else:
text_type = unicode
wsgi_app
ctx = self.request_context(environ)
error = None
try:
try:
ctx.push()
response = self.full_dispatch_request()
except Exception as e:
error = e
response = self.handle_exception(e)
except:
error = sys.exc_info()[1]
full_dispatch_request
request_started.send(self)
rv = self.preprocess_request()
if rv is None:
rv = self.dispatch_request()
except Exception as e:
rv = self.handle_user_exception(e)
return self.finalize_request(rv)
def finalize_request(self, rv, from_error_handler=False):
"""Given the return value from a view function this finalizes
the request by converting it into a response and invoking the
handle_user_exception
return self.handle_http_exception(e)
handler = self._find_error_handler(e)
if handler is None:
reraise(exc_type, exc_value, tb)
return handler(e)
def handle_exception(self, e):
"""Default exception handling that kicks in when an exception
occurs that is not caught. In debug mode the exception will
reraise
from io import StringIO
def reraise(tp, value, tb=None):
if value.__traceback__ is not tb:
raise value.with_traceback(tb)
raise value
implements_to_string = _identity
else:
text_type = unicode
full_dispatch_request
self.try_trigger_before_first_request_functions()
try:
request_started.send(self)
rv = self.preprocess_request()
if rv is None:
rv = self.dispatch_request()
except Exception as e:
rv = self.handle_user_exception(e)
return self.finalize_request(rv)
def finalize_request(self, rv, from_error_handler=False):
dispatch_request
# request came with the OPTIONS method, reply automatically
if getattr(rule, 'provide_automatic_options', False) \
and req.method == 'OPTIONS':
return self.make_default_options_response()
# otherwise dispatch to the handler for that endpoint
return self.view_functions[rule.endpoint](**req.view_args)
def full_dispatch_request(self):
"""Dispatches the request and on top of that performs request
pre and postprocessing as well as HTTP exception catching and
error handling.
display_blog
Function to show a blog post by id
"""
@app.route('/blog/<int:blog_id>')
def display_blog(blog_id=1):
blog_data = Blog.query.filter_by(id=blog_id).first()
blog_data.date_str = datetime.strftime(blog_data.date_posted, "%d.%m.%Y")
recent_posts = Blog.query.filter_by(category=blog_data.category).filter(Blog.id!=blog_id).order_by(Blog.date_posted.desc()).limit(5).all()
for post in recent_posts:
post.date_str = datetime.strftime(post.date_posted, "%d.%m.%Y")
return render_template('default.html',
content=render_template('blog-single.html', blog_data=blog_data, recent_posts=recent_posts))
AttributeError: 'NoneType' object has no attribute 'date_posted'
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