NoReverseMatch at /fv/ Reverse for 'task_status' with arguments '('',)' not found. 1 pattern(s) tried: ['celery-progress/(?P<task_id>[\\w-]+)/$'] about celery-progress HOT 15 CLOSED

Oh dear, sorry about the delayed reply.

If the task is called in the view and then you are rendering the progress bar on the resulting page then you should just pass task_id directly from the view.

See this section of the readme for how that looks.

If you are triggering the task from the page itself (e.g. via ajax or something) it's a bit trickier. One hack you can do is something like the below using a stub task id to get the URL:

// on page load
var progressUrl = "{% url 'celery_progress:task_status' 'task-id-stub' %}";
// in callback function - assumes api response returns the task id
var taskUrl = progressUrl.replace('task-id-stub', response.text);

Does that help?

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I have the same issue. +1. Where is the task_id actually defined?

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i'm seeing the same issue as well.

django.urls.exceptions.NoReverseMatch: Reverse for 'task_status' with arguments '('',)' not found. 1 pattern(s) tried: ['celery-progress/(?P<task_id>[\\w-]+)/$']

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Same issue. Any suggestions?

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In settings.py, try this:
path('celery-progress/', include('celery_progress.urls')),

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Hi, czue
I'm with the same issue, i tried your answer but, didn't worked for me,

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Can you share your view code and template?

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Same here. My console shows

Failed to load resource: the server responded with a status of 500 (Internal Server Error) at
127.0.0.1:8000/celery-progress/bddc2f0a-91d5-42ca-bf94-a5deb8d55305/ which shows the Django error:
'DisabledBackend' object has no attribute '_get_task_meta_for'

I added these lines, based on the 2nd solution, right before the task definition
from celery import Celery
app = Celery('tasks', backend='rpc://', broker='pyamqp://')

With this code in the Views,

def pdf_add(request, slug):
        if form.is_valid():
                # some code to upload a pdf file and split each page into .pdf and .jpg 
                # for further work
                # below work is just a sample example to test the library
		result = obj.my_task.delay(10)
		context['task_id'] = result.task_id
		return redirect('projects_details',project.slug)
	pdf = PDF_file()
	result = pdf.my_task.delay(10)
	context['task_id'] = result.task_id
	return render(request, template_name, context)

Doing so, removes the console error as it now has a backend but not the one of celery-progress (I think), I even see my terminal refreshing every second with Get / celery-progress/some_task_id but the "0 of 100 proceeded" doesn't change when the task is called.
I also tried adding this line, based on the 3rd solution on the same previous link:
CELERY_RESULT_BACKEND='djcelery.backends.database:DatabaseBackend' but it didn't change a thing.
I don't know how to make it pick the library's backend.
And if I remove the pdf = PDF_file() result = pdf.my_task.delay(10) context['task_id'] = result.task_id
from the GET part of the View function, I'm back to the starting problem with NoReverseMatch..." error back

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celery and your web app (I assume django) need to use the same backend.

So if you're using rpc:// when you call celery then you should add CELERY_RESULT_BACKEND='rpc://' to settings.py I believe.

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Hi @czue
I followed the corrections you stated. For me, the no reverse error is fixed. However, the issue now is we are getting the task ID only after the task is completely executed. So the progress does not start until the entire task is completed. Do we need to send 2 ajax requests, one where we return only the task_id and other for the other variables involved in the task which I want in my front-end?

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Are you using ALWAYS_EAGER? That would cause the task to be executed synchronously.

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I have the same issue.

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@ludwigwittgenstein2 it looks like the task ID is blank, which either means you're not properly passing it to the template, or the celery setup is not returning valid task IDs (check the result backend).

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Closing this out since I believe this is a configuration problem and not an issue with the library.

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Hi @czue, I have tried your advice but the error still there. In my case, the webpage was worked but when I upload a video, the web shows me the error. It is said the same look as the post of @ludwigwittgenstein2. Could you help me, please? Hope to hear from you soon.

Thank you so much.
Best regards.

Oh dear, sorry about the delayed reply.

If the task is called in the view and then you are rendering the progress bar on the resulting page then you should just pass task_id directly from the view.

See this section of the readme for how that looks.

If you are triggering the task from the page itself (e.g. via ajax or something) it's a bit trickier. One hack you can do is something like the below using a stub task id to get the URL:

// on page load
var progressUrl = "{% url 'celery_progress:task_status' 'task-id-stub' %}";
// in callback function - assumes api response returns the task id
var taskUrl = progressUrl.replace('task-id-stub', response.text);

Does that help?

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