Django的URL正則表達式匹配，但找不到網頁的錯誤

Question

項目名稱：JalaBapa_website

JalaBapa_website \網址：

from django.conf.urls import include, url 
from django.contrib import admin 

urlpatterns = [ 
    url(r'^admin/', admin.site.urls), 
    url(r'^about_us/', include('About_Us.urls')), 
    url(r'^activities/', include('Activities.urls')), 
    url(r'^collections/', include('Collections.urls')), 
    url(r'^contact_us/', include('Contact_Us.urls')), 
    url(r'^donate/', include('Donate.urls')), 
    url(r'^events/', include('Events.urls')), 
    url(r'^home/', include('Home.urls')), 
    url(r'^publications/', include('Publications.urls')), 
] 

出版物/ urls.py：

from django.conf.urls import url 
from . import views 

app_name = "Publications" 

urlpatterns = [ 
    # /publications/ 
    url(r'^$', views.publications, name='publications'), 
    # /publications/Xyz_9999.pdf/ 
    url(r'(?P<file_name>^[A-Z][a-z]+\_[0-9]{4}\.pdf$)', views.pdfs, name='pdfs') 
] 

出版物/ views.py

from django.http import HttpResponse, FileResponse 
from django.shortcuts import get_object_or_404, render 
from .models import * 
# Create your views here. 


def publications(request): 

    all_files = Publications.objects.all() 
    uploaded_file_names = [] 
    for obj in all_files: 
     uploaded_file_names.append(str(obj.file_name())) 
     context = { 
     'uploaded_file_names': uploaded_file_names 
     } 
    return render(request, 'publications/publications.html', context) 


def pdfs(request, file_name): 
    with open('media/pdfs/'+file_name, 'r') as pdf: 
     response = FileResponse(pdf, content_type='application/pdf') 
     return response 

一些代碼：出版物/模板/出版/ publications.html

<div class="container-fluid"> 
    {% for file_name in uploaded_file_names %} 
    <a href="{{ file_name }}"> 
    <!-- <a href="{% url 'Publications:pdfs' file_name %}"> 

將繼續...

摘錄上面一行是因爲COMMENTED之前，這是示值誤差：

NoReverseMatch at/publications/

找不到'pdfs'（'July_2017'，''）。 1個圖案（多個）嘗試：[ '出版物/（ΔP^ [AZ] [AZ] + \ _ [0-9] {4} \ PDF $。）']

Here is Error Screen Shot image

我想知道這是爲什麼不工作 - 問題1

總之，<a href="{{ file_name }}">被硬編碼，但運行，所以我暫時

移動關於繼續留一半以上文件...

 <div style="float: left;" class="boxes black-container text-grow"> 
      {{ file_name }} 
     </div> 
    </a> 
    {% endfor %} 
</div> 

的問題 - 2：在剛剛上面的文件publications.html，當我點擊{{ file_name }}，它讓我錯誤404頁面沒有找到，here is screen shot of that page

的鏈接：127.0.0.1:8000/publications/July_2017

的網址匹配是：url(r'^publications/', include('Publications.urls'))和url(r'(?P<file_name>^[A-Z][a-z]+\_[0-9]{4}\.pdf$)', views.pdfs, name='pdfs')

雖然，當我去https://www.regextester.com/88429網站它顯示我，我的文件名：July_2017.pdf與正則表達式匹配：^\[A-Z\]\[a-z\]+\_\[0-9\]{4}\.pdf$

Answer 1

這可能不是答案 - 我對django不是很有信心，但是我沒有足夠的聲望來發表評論。

問題1.你的插入符（'^'）看起來與我的不同 - 我真的只把它看作是引號內的第一個字符（例如r'^ publications /（？P等）。我看不到這會導致問題，但它可能是一些嘗試。

問題2，視圖'pdfs'試圖服務FileResponse對象，但是您的文件名變量（'July_2017'）被剝離'.pdf'擴展名將允許它成功打到文件？