Reverse for 'process_data' not found. 'process_data' is not a valid view function or pattern name.

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ratnadeep ray

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Jun 24, 2020, 9:26:43 AM6/24/20
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Hi all, 

I am trying to direct the option selected from the dropdown in the index.html along with the value to the process_data method in the views.py. But now I am getting the following error when I am trying to load my index page: 

NoReverseMatch at /index/

Reverse for 'process_data' not found. 'process_data' is not a valid view function or pattern name.



My index.html file is as follows: 

<html lang="en">
<head>
    <meta http-equiv="CONTENT-TYPE" content="text/html; charset=utf-8">
    <title>Home</title>
</head>
<body>
  <center>
  <h3>Index page</h3>
  <table align='center'>
  <tr><td>Select the version to compare with</td><td>
  <select name="version" id="version" onchange="location = this.value;">
 <option>Select version to compare with</option>
 {%for ver in version_list%}
 <option value={{ver}} href="{% url 'process_data' ver %}">{{ver}}</option>
 {% endfor %}
  </select>
  </td></tr>
  <tr><td>The current version</td><td>{{version}}</td>
  </tr>
  </table>
  <br><br><br>
</body>
</html>

My view file content is like this: 

def index(request):
    #query_results = QRC_DB.objects.all()
    global percentage_variation
    percentage_variation = 0
    global version
    version = None 
    context = RequestContext(request)
    response_context = get_result(request)
    #print("The response_context values  = \n %s" %response_context.get("get_result"))
    cursor  = connection.cursor()
    cursor.execute("select version from fusioncharts_qrc_db group by version")
    rows = cursor.fetchall()
    #print("The fetched rows =\n")
    #print(rows)
    version_list = []
    #print(version_list)
    for ver in rows:
        version = str(ver).split("'")[1]
        version_list.append(version)

    print("The final version list = %s" %version_list)
    return render(request, 'index.html', {
        'version': version, 
        'version_list': version_list,        
        })


def process_data(request,ver):
   
    print("==============The version selected = %s===========" %ver)

    return render(request, 'display_data.html', {
        'version': version,
     
        })


The url file contents are as follows: 

from django.urls import path
from fusioncharts import views


urlpatterns = [
    path('push-data/', views.push_data, name='push-data'),
    path('home/', views.home, name='home'),
    path('display_data/<str:component>', views.display_data, name='display_data'),
    path('index/', views.index, name='index'),
]

from django.contrib import admin
from django.urls import path,include


urlpatterns = [
    path('admin/', admin.site.urls),
    path('', include('fusioncharts.urls'))
]

Can anyone please help me why the above error is coming and how to fix that ? 

ratnadeep ray

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Jun 24, 2020, 1:22:05 PM6/24/20
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Hi all,

Any comment on this?

Ogunsanya Opeyemi

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Jun 24, 2020, 1:56:42 PM6/24/20
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You do not have a URL for process_data that you want to access, that is why it is saying no valid view name process_data


On Wednesday, June 24, 2020, ratnadeep ray <ratna...@gmail.com> wrote:
Hi all,

Any comment on this?

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ratnadeep ray

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Jun 24, 2020, 2:14:07 PM6/24/20
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So I need to add this also:

urlpatterns = [
...
...
path('process_data/', views.process_data, name='process_data'),

Ogunsanya Opeyemi

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Jun 24, 2020, 2:55:17 PM6/24/20
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Yes

On Wednesday, June 24, 2020, ratnadeep ray <ratna...@gmail.com> wrote:
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OGUNSANYA OPEYEMI

ratnadeep ray

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Jun 25, 2020, 1:41:36 AM6/25/20
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Hi Ogunsanya, 

I have added that line of code but still getting the same error. 

So what can be done next ? 


On Thursday, 25 June 2020 00:25:17 UTC+5:30, Ogunsanya Opeyemi wrote:

Yes
On Wednesday, June 24, 2020, ratnadeep ray <ratna...@gmail.com> wrote:
So I need to add this also:



urlpatterns = [
    ...
    ...
    path('process_data/', views.process_data, name='process_data'),

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Ogunsanya Opeyemi

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Jun 25, 2020, 2:38:12 AM6/25/20
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Also include in your URL before your urlpatterns 

app_name=yourappname


And in your template URL  write
{% url 'yourappname:process_data' ver %}



And if you still have issues send the update you made and let me check.
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ratnadeep ray

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Jun 25, 2020, 5:25:29 AM6/25/20
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Hi Ogunsanya,

Now I added the same as per your suggestion. Following is my urls.py contnent

from django.urls import path
from fusioncharts import
views
app_name = 'fusioncharts'



urlpatterns = [
    path('push-data/', views.push_data, name='push-data'),
    path('home/', views.home, name='home'),
    path('display_data/<str:component>', views.display_data, name='display_data'),

    path('index/', views.index, name=''),
    path('process_data/<str:ver>', views.process_data, name='process_data'),
]

And my template content (process_data.py)is as follows: 

<html lang="en">
<head>
    <meta http-equiv="CONTENT-TYPE" content="text/html; charset=utf-8">
    <title>Home</title>
</head>
<body>
  <center>
  <h3>Index page</h3>
  <table align='center'>
  <tr><td>Select the version to compare with</td><td>
  <select name="version" id="version" onchange="location = this.value;">
 <option>Select version to compare with</option>

 {%for ver in version_list%}
 <option value={{ver}} href="{% url 'fusioncharts:process_data' ver %}">{{ver}}</option>

 {% endfor %}
  </select>
  </td></tr>
  <tr><td>The current version</td><td>{{version}}</td>
  </tr>
  </table>
  <br><br><br>
</body>
</html>


But now I am getting the following error: 

Page not found (404)

Request Method:GET
Request URL:http://127.0.0.1:8000/index/11.5.1.18900-96

http://127.0.0.1:8000/index/11.5.1.18900-97


Using the URLconf defined in Piechart_Excel.urls, Django tried these URL patterns, in this order:
admin/
push-data/ [name='push-data']
home/ [name='home']
display_data/<str:component> [name='display_data']
index/
process_data/<str:ver> [name='process_data']

The current path, index/11.5.1.18900-96, didn't match any of these.


Can you suggest now what's going wrong ? 



Ogunsanya Opeyemi

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Jun 25, 2020, 8:16:52 AM6/25/20
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Look at your index path it is not written very well in the name you wrote name=') without closing the apstorphe ' and request a url purely in your template href like this href="process_data/{{ver}}".
And let me know wether it worked or not.
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OGUNSANYA OPEYEMI

ratnadeep ray

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Jun 26, 2020, 9:28:50 AM6/26/20
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Hi Ogunasya, 

I tried that but still that's not working. After some research and analysis, I realized the issue is not with the urls but with the html file. When I am trying to direct to the url in the href via drop-down only, the error is coming. But if we I am trying to access the same url via table, it is working fine. 

So to summarize: 
Working: 
<tr><td><a href="{% url 'process_data' ver1 %}">{{ver}}</a></td></tr>


Non-working: 
<option value={{ver}} href="{% url 'process_data' ver %}">{{ver}}</option>

Can you please suggest what is going wrong ? How can we reach the method 'process_data' using dropdown ? 

Ogunsanya Opeyemi

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Jun 26, 2020, 2:25:23 PM6/26/20
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Ok good job 👍

You can email me directly for any issue. 
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