Getting the except django.core.exceptions.ImproperlyConfigured while querying DB

[ratnadeep ray]

I am trying to fetch a few rows from the DB using the following code in my views.py:

from django.http import HttpResponse
from django.shortcuts import render
from fusioncharts.models import QRC_DB

def display_data(request,component):
    query_results = QRC_DB.objects.get(component_name__contains=component)
    return HttpResponse("You're looking at the component %s." % component)

For the above, I am getting the following exception:

django.core.exceptions.ImproperlyConfigured: The included URLconf 'Piechart_Excel.urls' does not appear to have any patterns in it. If you see valid patterns in the file then the issue is probably caused by a circular import.

However whenever I am removing/commenting out the below line, the above exception disappears:

query_results = QRC_DB.objects.get(component_name__contains=component)

Can anyone say what can be going wrong here? 

urls.py file under app is as follows: 

from django.urls import path
from fusioncharts import views

urlpatterns 
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'),
]
The url under the main project is as follows: 
from django.contrib import admin
from django.urls import path,include

urlpatterns 
urlpatterns = [
    path('admin/', admin.site.urls),
    path('', include('fusioncharts.urls'))
]
So please advise what's going wrong. 

[Hella Nick]

如果您确定数据库中有数据的话，那么就是您该视图的url设计错误。Django数据库查询的get方法查询不到数据会报错。希望可以帮助到您。

ratnadeep ray <ratna...@gmail.com> 于2020年5月20日周三 下午4:16写道：

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[Hella Nick]

此处有语法错误： path('display_data/<str:component>', views.display_data, name='display_data'),  

正确的写法为：path(r'^display_data/<str:component>/$', views.display_data, name='display_data/'),

请记住，一定要加 /