fixed bug

app/app/views.py

@@ -2,6 +2,7 @@
 from django.db.models import Count
 from django.http import HttpResponse
 from django.shortcuts import get_object_or_404, render
+from django.utils.http import urlencode
 from django.utils.translation import gettext as _
 
 from general.filters import DocumentFileFilter
@@ -255,21 +256,13 @@ def search(request):
     return render(request, template_name=template, context=context)
 
 
-def pagination_url(
-    request,
-):
+def pagination_url(request):
     url_params = {
         "search": request.GET.get("search", ""),
-        "document_type": request.GET.get("document_type", ""),
-        "institution": request.GET.get("institution", ""),
-        "subjects": request.GET.get("subjects", ""),
-        "languages": request.GET.get("languages", ""),
+        "document_type": request.GET.getlist("document_type", []),
+        "institution": request.GET.getlist("institution", []),
+        "subjects": request.GET.getlist("subjects", []),
+        "languages": request.GET.getlist("languages", []),
     }
 
-    return "?search={search}&document_type={document_type}&institution={institution}&subjects={subjects}&languages={languages}".format(
-        search=url_params["search"],
-        document_type=url_params["document_type"],
-        institution=url_params["institution"],
-        subjects=url_params["subjects"],
-        languages=url_params["languages"],
-    )
+    return "?" + urlencode(url_params, doseq=True)