在使用flask创建的浏览器中打开页面时出现错误。
我认为错误在于使用get_cache。我试图解决此错误，但无法获得确切的解决方案。我已经从flask_caching import Cache导入了缓存。出现错误的main_views代码如下：
class InvalidUser(Exception):
pass
class InvalidAction(Exception):
pass
@main_views.route('/')
def index():
return render_template("index.html")
class BaseQuestionView(MethodView):
decorators = [auth_required('session')]
def get_model(self, id):
question = Question.query.filter_by(id=id).first()
if question.user == current_user:
return question
else:
raise InvalidUser()
def get_cache_key(self, id):
return "{0}_question_status".format(id)
def get_cache(self, id):
from app import cache
return cache.get(self.get_cache_key(id))
def set_cache(self, id, val):
from app import cache
return cache.set(self.get_cache_key(id), val)
class QuestionView(BaseQuestionView):
def get_questions(self):
questions = current_user.questions
for q in questions:
q.status = self.get_cache(q.id)
return questions
def get(self):
form_obj = QuestionForm()
form = render_template("forms/question.html", form=form_obj)
return render_template("questions.html", questions=self.get_questions(), form=form)
def post(self):
form_obj = QuestionForm()
if form_obj.validate_on_submit():
form_obj.save()
return redirect(url_for('main_views.questions'))
form = render_template("forms/question.html", form=form_obj)
return render_template("questions.html", questions=self.get_questions(), form=form)
main_views.add_url_rule('/questions', view_func=QuestionView.as_view('questions'))
class QuestionDetailView(BaseQuestionView):
def get_upload_form(self, model):
upload_obj = EssayUploadForm()
upload_form = render_template("forms/upload.html", form=upload_obj, question=model)
return upload_form
def get(self, id):
model = self.get_model(id)
form_obj = EssayForm()
form = render_template("forms/essay.html", form=form_obj, question=model)
return render_template("question.html", question=model, form=form, status=self.get_cache(id), upload_form=self.get_upload_form(model))
def post(self, id):
form_obj = EssayForm()
model = self.get_model(id)
if form_obj.validate_on_submit():
form_obj.save(model)
return redirect(url_for('main_views.question_detail', id=id))
form = render_template("forms/essay.html", form=form_obj, question=model)
return render_template("question.html", question=model, form=form, status=self.get_cache(id), upload_form=self.get_upload_form(model))
def delete(self, id):
from app import db
question = self.get_model(id)
db.session.delete(question)
db.session.commit()
return jsonify({})
main_views.add_url_rule('/question/<int:id>', view_func=QuestionDetailView.as_view('question_detail'))
class QuestionActionView(BaseQuestionView):
actions = ["create", "create_and_score", ]
def create(self, model):
from core.tasks.tasks import create_model
task_status = create_model.delay(model.id)
return task_status.id
def create_and_score(self, model):
from core.tasks.tasks import create_and_score
task_status = create_and_score.delay(model.id)
return task_status.id
def get(self, id, action):
model = self.get_model(id)
if action not in self.actions:
raise InvalidAction()
task_id = getattr(self, action)(model)
self.set_cache(id, url_for('main_views.task_status', task_id=task_id))
return jsonify({})
main_views.add_url_rule('/question/<int:id>/<string:action>', view_func=QuestionActionView.as_view('question_action'))
class EssayUploadView(BaseQuestionView):
def post(self, id):
form_obj = EssayUploadForm()
if form_obj.validate_on_submit():
model = self.get_model(id)
file = request.files['upload']
form_obj.save(model, file)
return redirect(url_for('main_views.question_detail', id=id))
main_views.add_url_rule('/question/<int:id>/upload_essays', view_func=EssayUploadView.as_view('essay_upload'))
class BaseEssayView(MethodView):
decorators = [auth_required('session')]
def get_model(self, id):
essay = Essay.query.filter_by(id=id).first()
if essay.question.user == current_user:
return essay
else:
raise InvalidUser()
def get_cache_key(self, id):
return "{0}_essay_status".format(id)
def get_cache(self, id):
from app import cache
return cache.get(self.get_cache_key(id))
def set_cache(self, id, val):
from app import cache
return cache.set(self.get_cache_key(id), val)
class EssayDetailView(BaseEssayView):
def delete(self, id):
from app import db
essay = self.get_model(id)
db.session.delete(essay)
db.session.commit()
return jsonify({})
main_views.add_url_rule('/essay/<int:id>', view_func=EssayDetailView.as_view('essay_detail'))
class EssayActionView(BaseEssayView):
actions = ["score", ]
def score(self, model):
from core.tasks.tasks import score_essay
task_status = score_essay.delay(model.id)
return task_status.id
def get(self, id, action):
model = self.get_model(id)
if action not in self.actions:
raise InvalidAction()
task_id = getattr(self, action)(model)
self.set_cache(id, url_for('main_views.task_status', task_id=task_id))
return jsonify({})
main_views.add_url_rule('/essay/<int:id>/<string:action>', view_func=EssayActionView.as_view('essay_action'))
class TaskStatusView(MethodView):
decorators = [auth_required('session')]
def get(self, task_id):
from app import celery
result = celery.AsyncResult(task_id)
state, retval = result.state, result.result
response_data = dict(id=task_id, status=state)
if state in states.EXCEPTION_STATES:
traceback = result.traceback
response_data.update({'exc': get_full_cls_name(retval.__class__),
'traceback': traceback})
return jsonify({'task': response_data})
main_views.add_url_rule('/tasks/<string:task_id>', view_func=TaskStatusView.as_view('task_status'))
跟踪：
File "C:\Users\HP\Downloads\EssayGradingSystem\venv\lib\site-packages\flask\app.py", line 2328, in __call__
return self.wsgi_app(environ, start_response)
File "C:\Users\HP\Downloads\EssayGradingSystem\venv\lib\site-packages\flask\app.py", line 2314, in wsgi_app
response = self.handle_exception(e)
File "C:\Users\HP\Downloads\EssayGradingSystem\venv\lib\site-packages\flask\app.py", line 1760, in handle_exception
reraise(exc_type, exc_value, tb)
File "C:\Users\HP\Downloads\EssayGradingSystem\venv\lib\site-packages\flask\app.py", line 2311, in wsgi_app
response = self.full_dispatch_request()
File "C:\Users\HP\Downloads\EssayGradingSystem\venv\lib\site-packages\flask\app.py", line 1834, in full_dispatch_request
rv = self.handle_user_exception(e)
File "C:\Users\HP\Downloads\EssayGradingSystem\venv\lib\site-packages\flask\app.py", line 1737, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "C:\Users\HP\Downloads\EssayGradingSystem\venv\lib\site-packages\flask\app.py", line 1832, in full_dispatch_request
rv = self.dispatch_request()
File "C:\Users\HP\Downloads\EssayGradingSystem\venv\lib\site-packages\flask\app.py", line 1818, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "C:\Users\HP\Downloads\EssayGradingSystem\venv\lib\site-packages\flask_security\decorators.py", line 156, in decorated_view
return fn(*args, **kwargs)
File "C:\Users\HP\Downloads\EssayGradingSystem\venv\lib\site-packages\flask\views.py", line 88, in view
return self.dispatch_request(*args, **kwargs)
File "C:\Users\HP\Downloads\EssayGradingSystem\venv\lib\site-packages\flask\views.py", line 158, in dispatch_request
return meth(*args, **kwargs)
File "C:\Users\HP\Downloads\EssayGradingSystem\core\web\main_views.py", line 57, in get
return render_template("questions.html", questions=self.get_questions(), form=form)
File "C:\Users\HP\Downloads\EssayGradingSystem\core\web\main_views.py", line 51, in get_questions
q.status = self.get_cache(q.id)
File "C:\Users\HP\Downloads\EssayGradingSystem\core\web\main_views.py", line 41, in get_cache
return cache.get(self.get_cache_key(id))
File "C:\Users\HP\Downloads\EssayGradingSystem\venv\lib\site-packages\flask_caching\__init__.py", line 250, in get
return self.cache.get(*args, **kwargs)
File "C:\Users\HP\Downloads\EssayGradingSystem\venv\lib\site-packages\flask_caching\__init__.py", line 246, in cache
return app.extensions["cache"][self]
KeyError: <flask_caching.Cache object at 0x000000000606C6D8>