Django - Reverse for not found is not a valid view function or pattern name

Question

I m working on my project for a course and I m totally stuck right now  I m creating a website to sell products through paypal and the paypal return cancel pages are not rendering properly  I ve followed the examples in my lessons and checked the code a hundred times but obviously there is something I m missing   I m getting an error when I go to products  click buy now  login to paypal and then either cancel the purchase or buy the product and return to merchant s page  paypal return html and paypal cancel html are 2 templates saved under templates paypal    Can anybody see what I m missing    Here you can see the full code https   github com IreneG5 spss online  Traceback  Environment    Request Method  GET Request URL  http   127 0 0 1 8000 paypal-cancel   Django Version  1 11 4 Python Version  2 7 12 Installed Applications    django contrib admin     django contrib auth     django contrib contenttypes     django contrib sessions     django contrib messages     django contrib staticfiles     django forms bootstrap     paypal standard ipn     home     accounts     paypal store     products   Installed Middleware    django middleware security SecurityMiddleware     django contrib sessions middleware SessionMiddleware     django middleware common CommonMiddleware     django middleware csrf CsrfViewMiddleware     django contrib auth middleware AuthenticationMiddleware     django contrib messages middleware MessageMiddleware     django middleware clickjacking XFrameOptionsMiddleware     Template error  In template C  Users irene Documents Full-Stack-Developer Stream3 Project spss online templates base html  error at line 10    Reverse for    not found     is not a valid view function or pattern name    1      load staticfiles       2    lt  DOCTYPE html gt     3    lt html lang  en  gt     4    lt head gt     5        lt meta charset  UTF-8  gt     6        lt title gt Buy SPSS Online lt  title gt     7        lt meta name  viewport  content  width device-width  initial-scale 1 0  gt     8        lt meta name  description  content    gt     9        lt meta name  author  content    gt     10        lt link rel  stylesheet  href  https   cdnjs cloudflare com ajax libs bootswatch 3 3 7 cerulean bootstrap min css  gt     11        lt link rel  stylesheet  href     static  css style css      gt     12       13       14    lt  head gt     15    lt body gt     16    lt div class  container  gt     17        lt div class  container-fluid  gt     18            lt nav id  menu  class  navbar navbar-inverse  gt     19                lt button type  button  class  navbar-toggle  data-toggle  collapse  data-target   myNavbar  gt     20                    lt span class  icon-bar  gt  lt  span gt    Traceback   File  C  Users irene virtualenv spss online env lib site-packages django core handlers exception py  in inner   41              response   get response request   File  C  Users irene virtualenv spss online env lib site-packages django core handlers base py  in  get response   187                  response   self process exception by middleware e  request   File  C  Users irene virtualenv spss online env lib site-packages django core handlers base py  in  get response   185                  response   wrapped callback request   callback args    callback kwargs   File  C  Users irene Documents Full-Stack-Developer Stream3 Project spss online paypal store views py  in paypal cancel   15      return render request   paypal paypal cancel html   args   File  C  Users irene virtualenv spss online env lib site-packages django shortcuts py  in render   30      content   loader render to string template name  context  request  using using   File  C  Users irene virtualenv spss online env lib site-packages django template loader py  in render to string   68      return template render context  request   File  C  Users irene virtualenv spss online env lib site-packages django template backends django py  in render   66              return self template render context   File  C  Users irene virtualenv spss online env lib site-packages django template base py  in render   207                      return self  render context   File  C  Users irene virtualenv spss online env lib site-packages django template base py  in  render   199          return self nodelist render context   File  C  Users irene virtualenv spss online env lib site-packages django template base py  in render   990                  bit   node render annotated context   File  C  Users irene virtualenv spss online env lib site-packages django template base py  in render annotated   957              return self render context   File  C  Users irene virtualenv spss online env lib site-packages django template loader tags py  in render   177              return compiled parent  render context   File  C  Users irene virtualenv spss online env lib site-packages django template base py  in  render   199          return self nodelist render context   File  C  Users irene virtualenv spss online env lib site-packages django template base py  in render   990                  bit   node render annotated context   File  C  Users irene virtualenv spss online env lib site-packages django template base py  in render annotated   957              return self render context   File  C  Users irene virtualenv spss online env lib site-packages django template loader tags py  in render   72                  result   block nodelist render context   File  C  Users irene virtualenv spss online env lib site-packages django template base py  in render   990                  bit   node render annotated context   File  C  Users irene virtualenv spss online env lib site-packages django template base py  in render annotated   957              return self render context   File  C  Users irene virtualenv spss online env lib site-packages django template defaulttags py  in render   458              url   reverse view name  args args  kwargs kwargs  current app current app   File  C  Users irene virtualenv spss online env lib site-packages django urls base py  in reverse   91      return force text iri to uri resolver  reverse with prefix view  prefix   args    kwargs     File  C  Users irene virtualenv spss online env lib site-packages django urls resolvers py  in  reverse with prefix   497          raise NoReverseMatch msg   Exception Type  NoReverseMatch at  paypal-cancel  Exception Value  Reverse for    not found     is not a valid view function or pattern name

User · Answer

The syntax for specifying url is    url namespace url name     So  check if you have added the app name in urls py  In my case  I had misspelled the url name  The urls py had the following content path   lt int question id gt     views detail  name  question detail   whereas the index html file had the following entry  lt li gt  lt a href     url  polls detail  question id     gt    question question text    lt  a gt  lt  li gt   Notice the incorrect name

User · Answer

Give the same name in urls py   path  detail  lt int id gt    views detail  name  detail

User · Answer

In my case  this error occurred due to a mismatched url name  e g   lt form action  quot    url  test-view     quot  method  quot POST quot  gt   urls py path  quot test  quot   views test  name  test-view

User · Answer

If you dont define name in the path field  usually the error will come  e g   path  crud   ABC as view   name  crud

User · Answer

In my case  what I did was a mistake in the url tag in the respective template  So  in my url tag I had something like      url  polls details  question id     while in the views  I had written something like   def details request  question id       code here  So  the first thing you might wanna check is whether things are spelled as they shoould be  The next thing then you can do is as the people above have suggested

User · Answer

On line 10 there s a space between s and t  It should be one word  stylesheet

User · Answer

The common error that I have find is when you forget to define  your url in yourapp urls py  we don t want any suggetion   solution plz

User · Answer

Fix urlpatterns in urls py file  For example  my app name is  simulator      My URL pattern for login and logout looks like   urlpatterns                         url r  login     simulator views login view  name  login        url r  logout     simulator views logout view  name  logout

User · Answer

In my case  I don t put namespace name in the url tag ex     url  url name or pattern name      you have to specify the namespace name like     url  namespace name url name or pattern name      Explanation  In project urls py path     include  blog urls  namespace  blog     and in app s urls py you have to specify the app name  like app name    blog   namespace name is the app name

User · Answer

I was receiving the same error when not specifying the app name before pattern name   In my case    app-name   Blog  pattern-name   post-delete  reverse lazy  Blog post-delete    worked

User · Answer

Add store name to template like    url  app name url name     App name   store In urls py  path  search   views searched  name  quot searched quot     lt form action  quot    url  store searched     quot  method  quot POST quot  gt

User · Answer

When you use the url tag you should use quotes for string literals  for example      url  products       At the moment product is treated like a variable and evaluates to    in the error message

[python] Django - Reverse for '' not found. '' is not a valid view function or pattern name

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