[英]Flask-SQLAlchemy pagination error: Could not build url for endpoint with values ['page']
我很难理解是什么导致了我在尝试使用 Flask-SQLAlchemy 使分页正常工作时遇到的错误。 以下是相关页面的视图:
@main.route('/collections/<int:page>', defaults={"page": 1})
def all_collections(page):
users = User.users_with_bottles().paginate(page=page, per_page=1, error_out=False)
if users is None:
return redirect(url_for('main.collection',
name=current_user.username))
total_collections = Bottle.total_collections()
return render_template('gallery.html',
users=users,
total_num=total_collections,
title='Browse Collections')
这是gallery.html
的一部分,这似乎导致了这个问题:
{% for page in users.iter_pages() %}
{% if page %}
# the below line seems to be the issue
<a href="{{ url_for('main.all_collections', page=page) }}">{{ page }}</a>
{% else %}
...
{% endif %}
{% endfor %}
据我所知,有些页面应该用于链接,就像我这样做:
{% if page %}
{{ page }}
{% endif %}
它打印1 2 3
。 删除gallery.html
中的url_for
部分会导致http://127.0.0.1:5000/collections/1
正常加载。 我不确定这个问题的原因,因为我还有其他一些main.
具有动态 URL 的视图可以正常工作,所以我不知道在这种情况下我做错了什么。
以下是此问题的回溯:
Traceback (most recent call last):
File "C:\Users\Me\PycharmProjects\flask-sake-project\venv\Lib\site-packages\flask\app.py", line 2464, in __call__
return self.wsgi_app(environ, start_response)
File "C:\Users\Me\PycharmProjects\flask-sake-project\venv\Lib\site-packages\flask\app.py", line 2450, in wsgi_app
response = self.handle_exception(e)
File "C:\Users\Me\PycharmProjects\flask-sake-project\venv\Lib\site-packages\flask\app.py", line 1867, in handle_exception
reraise(exc_type, exc_value, tb)
File "C:\Users\Me\PycharmProjects\flask-sake-project\venv\Lib\site-packages\flask\_compat.py", line 39, in reraise
raise value
File "C:\Users\Me\PycharmProjects\flask-sake-project\venv\Lib\site-packages\flask\app.py", line 2447, in wsgi_app
response = self.full_dispatch_request()
File "C:\Users\Me\PycharmProjects\flask-sake-project\venv\Lib\site-packages\flask\app.py", line 1952, in full_dispatch_request
rv = self.handle_user_exception(e)
File "C:\Users\Me\PycharmProjects\flask-sake-project\venv\Lib\site-packages\flask\app.py", line 1821, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "C:\Users\Me\PycharmProjects\flask-sake-project\venv\Lib\site-packages\flask\_compat.py", line 39, in reraise
raise value
File "C:\Users\Me\PycharmProjects\flask-sake-project\venv\Lib\site-packages\flask\app.py", line 1950, in full_dispatch_request
rv = self.dispatch_request()
File "C:\Users\Me\PycharmProjects\flask-sake-project\venv\Lib\site-packages\flask\app.py", line 1936, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "C:\Users\Me\PycharmProjects\flask-sake-project\app\main\views.py", line 46, in all_collections
return render_template('gallery.html',
File "C:\Users\Me\PycharmProjects\flask-sake-project\venv\Lib\site-packages\flask\templating.py", line 137, in render_template
return _render(
File "C:\Users\Me\PycharmProjects\flask-sake-project\venv\Lib\site-packages\flask\templating.py", line 120, in _render
rv = template.render(context)
File "C:\Users\Me\PycharmProjects\flask-sake-project\venv\Lib\site-packages\jinja2\environment.py", line 1090, in render
self.environment.handle_exception()
File "C:\Users\Me\PycharmProjects\flask-sake-project\venv\Lib\site-packages\jinja2\environment.py", line 832, in handle_exception
reraise(*rewrite_traceback_stack(source=source))
File "C:\Users\Me\PycharmProjects\flask-sake-project\venv\Lib\site-packages\jinja2\_compat.py", line 28, in reraise
raise value.with_traceback(tb)
File "C:\Users\Me\PycharmProjects\flask-sake-project\app\templates\gallery.html", line 1, in top-level template code
{% extends 'base.html' %}
File "C:\Users\Me\PycharmProjects\flask-sake-project\app\templates\base.html", line 6, in top-level template code
{% block content %}{% endblock %}
File "C:\Users\Me\PycharmProjects\flask-sake-project\app\templates\gallery.html", line 39, in block "content"
<a href="{{ url_for('main.all_collections', page=page) }}">{{ page }}</a>
File "C:\Users\Me\PycharmProjects\flask-sake-project\venv\Lib\site-packages\flask\helpers.py", line 370, in url_for
return appctx.app.handle_url_build_error(error, endpoint, values)
File "C:\Users\Me\PycharmProjects\flask-sake-project\venv\Lib\site-packages\flask\app.py", line 2216, in handle_url_build_error
reraise(exc_type, exc_value, tb)
File "C:\Users\Me\PycharmProjects\flask-sake-project\venv\Lib\site-packages\flask\_compat.py", line 39, in reraise
raise value
File "C:\Users\Me\PycharmProjects\flask-sake-project\venv\Lib\site-packages\flask\helpers.py", line 357, in url_for
rv = url_adapter.build(
File "C:\Users\Me\PycharmProjects\flask-sake-project\venv\Lib\site-packages\werkzeug\routing.py", line 2179, in build
raise BuildError(endpoint, values, method, self)
werkzeug.routing.BuildError: Could not build url for endpoint 'main.all_collections' with values ['page'].
编辑:我还会注意到,我对这个错误的解决方案的所有搜索都没有真正帮助,因此我问了这个问题。 我只发现了另一篇 Stack Overflow 帖子,其中有人遇到了与我相同的问题,并且它没有被接受的答案(通常很少有回复)。
我认为您处理默认值的方式出了什么问题,您目前有:
@main.route('/collections/<int:page>', defaults={"page": 1})
def all_collections(page):
...
然后你传入一个页面 integer 以及url_for('...', page=x)
所以 flask 以两个值结束,并且变得脾气暴躁。 你想要做的是这样的:
@main.route('/collections/<int:page>')
@main.route('/collections/', defaults={'page': 1} # if no page is asked for-- return page 1.
def all_collections(page):
...
所以现在/collections/
将使用默认值1
但如果您指定一个page
,您会触发另一个路由选项,并且不会混淆。
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