How to Solve Error Message NoReverseMatch at / Reverse for ‘my_function’ not found. ‘my_function’ is not a valid view function or pattern name. when running Django Application

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Introduction

Actually, this article exist because of an error appear upon trying the article ‘How to Call a Function by clicking a Button in the Django Template File from a Django Application. So, upon creating a button to be clicked in order to call a function exist in a Django application, it stumbled upon a certain error. Actually, the error message exist as part of the title of this article. For more information, below is the appearance of the error message :

NoReverseMatch at /

Reverse for 'my_function' not found. 'my_function' is not a valid view function or pattern name.
Request Method: GET
Request URL: http://localhost:8000/
Django Version: 4.1.1
Exception Type: NoReverseMatch
Exception Value: Reverse for ‘my_function’ not found. ‘my_function’ is not a valid view function or pattern name.

How to Solve Error Message NoReverseMatch at / Reverse for ‘my_function’ not found. ‘my_function’ is not a valid view function or pattern name.

So, at the time the click process is executed in the button exist in the Django template file for calling a function with the name of ‘my_function’ in the Django application, the error appear. The error already exist in the above part. As it exist as part of the error message, Django application cannot find ‘my_function’ URL. Either the function does not exist in the view as part of the error message ‘ ‘my_function’ is not a valid view function’. Nor the function does not have any pattern name. So, in order to solve the error message, the following is the steps for solving it :

  1. First of all, just open the ‘urls.py’ file exist as part of the Django application. In this context, it is exist in the ‘apps’ folder. The following below is the actual original content of the ‘urls.py’ file :

    from django.urls import path
    from apps import views
    urlpatterns = [
        path('', views.index, name="index"),
    
  2. Apparently, the ‘my_function’ URL does not exist. In that case, clicking the button for calling ‘my_function’ method will only triggering the error. So, in order to solve the problem just add an URL with the name of ‘my_function’ as follows :

    path('my_function', views.my_function, name="my_function"),

    The URL defintion above means that if there is any match for the URL name of ‘my_function’ just process it by executing the function with the name of ‘my_function’ exist in the ‘views.py’ file. So, overall the ‘urls.py’ file will be as in the following revision :

    from django.urls import path
    from apps import views
    urlpatterns = [
        path('', views.index, name="index"),
        path('my_function', views.my_function, name="my_function"),
    ]
  3. Last but not least, just continue on further by refreshing the Django application and start clicking the button once more. If there are no further error messages appear, it will call the function with the name of ‘my_function’ properly.

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