[Flask] "could not build URL for endpoint"?

[Anthony Ford]

If you're not using blueprints, leave it off (see
http://flask.pocoo.org/docs/0.10/blueprints/#building-urls).

I'm not sure if it will cause problems if you aren't using blueprints, or
if it will just ignore it.

In a blueprint, it tells werkzueg to use the current blueprint as the
source of handler functions, instead of the global pool. If you don't use
the leading period and have a function name crash (i.e. index in your admin
blueprint and index in your public blueprint), it won't know which one to
use (or may choose incorrectly). You can also specify blueprints if you
need to reach across blueprints (i.e. have a link to the login page within
your admin blueprint) , by specifying the blueprint name (say
"admin.login").


Anthony Ford,
KF5IBN,
ford.anthonyj at gmail.com

On Wed, May 11, 2016 at 8:36 AM, Alex Hall <ahall at autodist.com> wrote:

> Okay, thanks--that explains a lot! I had a function called 'index', but
> moved my decorators for / and /index off of it. I didn't realize url_for
> worked that way, so I was calling a function that had no app.route
> decorators. This explains so much.
>
> Your example said to use url_for('.foobar')}}. Was the period supposed to
> be before the function name, or was that a typo? Just want to make sure
> there's not some other aspect I'm missing. Thanks.
>
> On Wed, May 11, 2016 at 9:32 AM, Anthony Ford <ford.anthonyj at gmail.com>
> wrote:
>
>> Your running into an uissue in that url_for doesn't take the path ( the
>> "/foo/bar" in "example.com/foo/bar") but the function which provides the
>> view you want.
>>
>> If you define a route (say "/index"), and the function that handles that
>> route is foobar(), then you would use url_for('foobar').
>>
>> So for:
>>
>> @app.route('/index')
>> def foobar():
>>     return render_template('foobar.html')
>>
>>
>> your template would have the following link:
>>
>> a href="{{url_for('.foobar')}}">Home</a
>>
>>
>> Hope that helps!
>>
>> Also, be careful with your quotes. While Jinja should pick up the quotes
>> within {{}} and handle them well, even with the outer quotes, it's good to
>> be in the habit of not mixing quotes. Use one type (i.e. double) for your
>> outer, and the other (single) for your inner. Since Python doesn't
>> differentiate between the types, it's safe to swap them as you desire.
>>
>>
>>
>> Anthony Ford,
>> KF5IBN,
>> ford.anthonyj at gmail.com
>>
>> On Wed, May 11, 2016 at 8:22 AM, Alex Hall <ahall at autodist.com> wrote:
>>
>>> Hello list,
>>> I have no idea what I changed--I've been messing with so many config
>>> files and apps lately--but suddenly I'm getting that error when I load my
>>> app. My templates use the 'url_for' function, as I'm told they should, but
>>> that seems to be failing for some reason. The only related change I can
>>> think of is that I recently added a couple more decorators to a view
>>> function, in an effort to always direct to a certain view when visitors go
>>> to the main site. That is
>>> myapp.mysite.com/search
>>> is redirected to by
>>> myapp.mysite.com
>>> or
>>> myapp.mysite.com/index
>>>
>>> The error is "could not build URL for endpoint '/index'. Did you mean
>>> '/search' instead?
>>>
>>> In my base template, I define a navigation bar. In the exception, the
>>> first url in that bar is causing the problem:
>>> a href="{{url_for("/index")}}">Home</a
>>>
>>> Might the problem be that I'm defining a link (/index) that will render
>>> as this view, because that's a decorator before the /search function? That
>>> doesn't make much sense to me, but I can't think what else it could be.
>>> Related: is there a better way of directing to a certain view than putting
>>> a bunch of app.route decorators in front of a single function? Is the
>>> recommended way to handle this in the web server configuration instead?
>>>
>>>
>>> --
>>> Alex Hall
>>> Automatic Distributors, IT department
>>> ahall at autodist.com
>>>
>>> _______________________________________________
>>> Flask mailing list
>>> Flask at python.org
>>> https://mail.python.org/mailman/listinfo/flask
>>>
>>>
>>
>
>
> --
> Alex Hall
> Automatic Distributors, IT department
> ahall at autodist.com
>
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