We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
Add filter/display of members-only value to document admin
### Is your feature request related to a problem? Please describe.
It is not really issue to see which documents are marked as members only. And it is impossible to easily get a list with documents that have a true/false value.

### Describe the solution you'd like
I'd like to see more information about the documents in the admin page so that I do not have to open the detail page.

### Motivation
Easier to manage these files.

### Describe alternatives you've considered
The only alternative is not doing this.

### Additional context
#2084 could have been prevented.


--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `website/documents/admin.py`
Content:
```
1 """Registers admin interfaces for the documents module."""
2 from django.contrib import admin
3 from django.contrib.admin import ModelAdmin
4 from django.utils.translation import gettext_lazy as _
5 
6 from documents import forms
7 from documents.models import (
8     AnnualDocument,
9     AssociationDocument,
10     EventDocument,
11     GeneralMeeting,
12     Minutes,
13     MiscellaneousDocument,
14 )
15 from documents.services import is_owner
16 
17 
18 class MinutesInline(admin.StackedInline):
19     """Inline for minutes of a general meeting."""
20 
21     model = Minutes
22     form = forms.MinutesForm
23     extra = 0
24 
25 
26 @admin.register(GeneralMeeting)
27 class GeneralMeetingAdmin(ModelAdmin):
28     """Manage the general meetings."""
29 
30     form = forms.GeneralMeetingForm
31     inlines = [
32         MinutesInline,
33     ]
34     list_filter = ("datetime",)
35 
36 
37 class LectureYearFilter(admin.SimpleListFilter):
38     """Filter the memberships on those started or ended in a lecture year."""
39 
40     title = _("lecture year")
41     parameter_name = "lecture_year"
42 
43     def lookups(self, request, model_admin):
44         if AnnualDocument.objects.count() > 0:
45             first_year = AnnualDocument.objects.order_by("year").first().year
46             last_year = AnnualDocument.objects.order_by("year").last().year
47 
48             return [
49                 (year, f"{year}-{year + 1}")
50                 for year in range(last_year, first_year - 1, -1)
51             ]
52         return []
53 
54     def queryset(self, request, queryset):
55         if not self.value():
56             return queryset
57 
58         year = int(self.value())
59 
60         return queryset.filter(year=year)
61 
62 
63 @admin.register(AnnualDocument)
64 class AnnualDocumentAdmin(ModelAdmin):
65     """Manage the annual documents."""
66 
67     form = forms.AnnualDocumentForm
68     list_filter = (
69         LectureYearFilter,
70         "created",
71         "last_updated",
72     )
73 
74 
75 @admin.register(AssociationDocument)
76 class AssociationDocumentAdmin(ModelAdmin):
77     """Manage the association documents."""
78 
79     form = forms.AssociationDocumentForm
80     list_filter = (
81         "created",
82         "last_updated",
83     )
84 
85 
86 @admin.register(EventDocument)
87 class EventDocumentAdmin(ModelAdmin):
88     """Manage the event documents."""
89 
90     form = forms.EventDocumentForm
91     list_filter = (
92         "created",
93         "last_updated",
94     )
95 
96     def has_change_permission(self, request, obj=None):
97         """Only allow access to the change form if the user is an owner."""
98         if obj is not None and not is_owner(request.member, obj):
99             return False
100         return super().has_change_permission(request, obj)
101 
102     def has_delete_permission(self, request, obj=None):
103         """Only allow delete access if the user is an owner."""
104         if obj is not None and not is_owner(request.member, obj):
105             return False
106         return super().has_delete_permission(request, obj)
107 
108 
109 @admin.register(MiscellaneousDocument)
110 class MiscellaneousDocumentAdmin(ModelAdmin):
111     """Manage the miscellaneous documents."""
112 
113     form = forms.MiscellaneousDocumentForm
114     list_filter = (
115         "created",
116         "last_updated",
117     )
118
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/website/documents/admin.py b/website/documents/admin.py
--- a/website/documents/admin.py
+++ b/website/documents/admin.py
@@ -69,6 +69,11 @@
         LectureYearFilter,
         "created",
         "last_updated",
+        "members_only",
+    )
+    list_display = (
+        "__str__",
+        "members_only",
     )
 
 
@@ -80,6 +85,11 @@
     list_filter = (
         "created",
         "last_updated",
+        "members_only",
+    )
+    list_display = (
+        "__str__",
+        "members_only",
     )
 
 
@@ -91,6 +101,11 @@
     list_filter = (
         "created",
         "last_updated",
+        "members_only",
+    )
+    list_display = (
+        "__str__",
+        "members_only",
     )
 
     def has_change_permission(self, request, obj=None):
@@ -114,4 +129,9 @@
     list_filter = (
         "created",
         "last_updated",
+        "members_only",
+    )
+    list_display = (
+        "__str__",
+        "members_only",
     )

{"golden_diff": "diff --git a/website/documents/admin.py b/website/documents/admin.py\n--- a/website/documents/admin.py\n+++ b/website/documents/admin.py\n@@ -69,6 +69,11 @@\n         LectureYearFilter,\n         \"created\",\n         \"last_updated\",\n+        \"members_only\",\n+    )\n+    list_display = (\n+        \"__str__\",\n+        \"members_only\",\n     )\n \n \n@@ -80,6 +85,11 @@\n     list_filter = (\n         \"created\",\n         \"last_updated\",\n+        \"members_only\",\n+    )\n+    list_display = (\n+        \"__str__\",\n+        \"members_only\",\n     )\n \n \n@@ -91,6 +101,11 @@\n     list_filter = (\n         \"created\",\n         \"last_updated\",\n+        \"members_only\",\n+    )\n+    list_display = (\n+        \"__str__\",\n+        \"members_only\",\n     )\n \n     def has_change_permission(self, request, obj=None):\n@@ -114,4 +129,9 @@\n     list_filter = (\n         \"created\",\n         \"last_updated\",\n+        \"members_only\",\n+    )\n+    list_display = (\n+        \"__str__\",\n+        \"members_only\",\n     )\n", "issue": "Add filter/display of members-only value to document admin\n### Is your feature request related to a problem? Please describe.\r\nIt is not really issue to see which documents are marked as members only. And it is impossible to easily get a list with documents that have a true/false value.\r\n\r\n### Describe the solution you'd like\r\nI'd like to see more information about the documents in the admin page so that I do not have to open the detail page.\r\n\r\n### Motivation\r\nEasier to manage these files.\r\n\r\n### Describe alternatives you've considered\r\nThe only alternative is not doing this.\r\n\r\n### Additional context\r\n#2084 could have been prevented.\r\n\n", "before_files": [{"content": "\"\"\"Registers admin interfaces for the documents module.\"\"\"\nfrom django.contrib import admin\nfrom django.contrib.admin import ModelAdmin\nfrom django.utils.translation import gettext_lazy as _\n\nfrom documents import forms\nfrom documents.models import (\n    AnnualDocument,\n    AssociationDocument,\n    EventDocument,\n    GeneralMeeting,\n    Minutes,\n    MiscellaneousDocument,\n)\nfrom documents.services import is_owner\n\n\nclass MinutesInline(admin.StackedInline):\n    \"\"\"Inline for minutes of a general meeting.\"\"\"\n\n    model = Minutes\n    form = forms.MinutesForm\n    extra = 0\n\n\n@admin.register(GeneralMeeting)\nclass GeneralMeetingAdmin(ModelAdmin):\n    \"\"\"Manage the general meetings.\"\"\"\n\n    form = forms.GeneralMeetingForm\n    inlines = [\n        MinutesInline,\n    ]\n    list_filter = (\"datetime\",)\n\n\nclass LectureYearFilter(admin.SimpleListFilter):\n    \"\"\"Filter the memberships on those started or ended in a lecture year.\"\"\"\n\n    title = _(\"lecture year\")\n    parameter_name = \"lecture_year\"\n\n    def lookups(self, request, model_admin):\n        if AnnualDocument.objects.count() > 0:\n            first_year = AnnualDocument.objects.order_by(\"year\").first().year\n            last_year = AnnualDocument.objects.order_by(\"year\").last().year\n\n            return [\n                (year, f\"{year}-{year + 1}\")\n                for year in range(last_year, first_year - 1, -1)\n            ]\n        return []\n\n    def queryset(self, request, queryset):\n        if not self.value():\n            return queryset\n\n        year = int(self.value())\n\n        return queryset.filter(year=year)\n\n\n@admin.register(AnnualDocument)\nclass AnnualDocumentAdmin(ModelAdmin):\n    \"\"\"Manage the annual documents.\"\"\"\n\n    form = forms.AnnualDocumentForm\n    list_filter = (\n        LectureYearFilter,\n        \"created\",\n        \"last_updated\",\n    )\n\n\n@admin.register(AssociationDocument)\nclass AssociationDocumentAdmin(ModelAdmin):\n    \"\"\"Manage the association documents.\"\"\"\n\n    form = forms.AssociationDocumentForm\n    list_filter = (\n        \"created\",\n        \"last_updated\",\n    )\n\n\n@admin.register(EventDocument)\nclass EventDocumentAdmin(ModelAdmin):\n    \"\"\"Manage the event documents.\"\"\"\n\n    form = forms.EventDocumentForm\n    list_filter = (\n        \"created\",\n        \"last_updated\",\n    )\n\n    def has_change_permission(self, request, obj=None):\n        \"\"\"Only allow access to the change form if the user is an owner.\"\"\"\n        if obj is not None and not is_owner(request.member, obj):\n            return False\n        return super().has_change_permission(request, obj)\n\n    def has_delete_permission(self, request, obj=None):\n        \"\"\"Only allow delete access if the user is an owner.\"\"\"\n        if obj is not None and not is_owner(request.member, obj):\n            return False\n        return super().has_delete_permission(request, obj)\n\n\n@admin.register(MiscellaneousDocument)\nclass MiscellaneousDocumentAdmin(ModelAdmin):\n    \"\"\"Manage the miscellaneous documents.\"\"\"\n\n    form = forms.MiscellaneousDocumentForm\n    list_filter = (\n        \"created\",\n        \"last_updated\",\n    )\n", "path": "website/documents/admin.py"}], "after_files": [{"content": "\"\"\"Registers admin interfaces for the documents module.\"\"\"\nfrom django.contrib import admin\nfrom django.contrib.admin import ModelAdmin\nfrom django.utils.translation import gettext_lazy as _\n\nfrom documents import forms\nfrom documents.models import (\n    AnnualDocument,\n    AssociationDocument,\n    EventDocument,\n    GeneralMeeting,\n    Minutes,\n    MiscellaneousDocument,\n)\nfrom documents.services import is_owner\n\n\nclass MinutesInline(admin.StackedInline):\n    \"\"\"Inline for minutes of a general meeting.\"\"\"\n\n    model = Minutes\n    form = forms.MinutesForm\n    extra = 0\n\n\n@admin.register(GeneralMeeting)\nclass GeneralMeetingAdmin(ModelAdmin):\n    \"\"\"Manage the general meetings.\"\"\"\n\n    form = forms.GeneralMeetingForm\n    inlines = [\n        MinutesInline,\n    ]\n    list_filter = (\"datetime\",)\n\n\nclass LectureYearFilter(admin.SimpleListFilter):\n    \"\"\"Filter the memberships on those started or ended in a lecture year.\"\"\"\n\n    title = _(\"lecture year\")\n    parameter_name = \"lecture_year\"\n\n    def lookups(self, request, model_admin):\n        if AnnualDocument.objects.count() > 0:\n            first_year = AnnualDocument.objects.order_by(\"year\").first().year\n            last_year = AnnualDocument.objects.order_by(\"year\").last().year\n\n            return [\n                (year, f\"{year}-{year + 1}\")\n                for year in range(last_year, first_year - 1, -1)\n            ]\n        return []\n\n    def queryset(self, request, queryset):\n        if not self.value():\n            return queryset\n\n        year = int(self.value())\n\n        return queryset.filter(year=year)\n\n\n@admin.register(AnnualDocument)\nclass AnnualDocumentAdmin(ModelAdmin):\n    \"\"\"Manage the annual documents.\"\"\"\n\n    form = forms.AnnualDocumentForm\n    list_filter = (\n        LectureYearFilter,\n        \"created\",\n        \"last_updated\",\n        \"members_only\",\n    )\n    list_display = (\n        \"__str__\",\n        \"members_only\",\n    )\n\n\n@admin.register(AssociationDocument)\nclass AssociationDocumentAdmin(ModelAdmin):\n    \"\"\"Manage the association documents.\"\"\"\n\n    form = forms.AssociationDocumentForm\n    list_filter = (\n        \"created\",\n        \"last_updated\",\n        \"members_only\",\n    )\n    list_display = (\n        \"__str__\",\n        \"members_only\",\n    )\n\n\n@admin.register(EventDocument)\nclass EventDocumentAdmin(ModelAdmin):\n    \"\"\"Manage the event documents.\"\"\"\n\n    form = forms.EventDocumentForm\n    list_filter = (\n        \"created\",\n        \"last_updated\",\n        \"members_only\",\n    )\n    list_display = (\n        \"__str__\",\n        \"members_only\",\n    )\n\n    def has_change_permission(self, request, obj=None):\n        \"\"\"Only allow access to the change form if the user is an owner.\"\"\"\n        if obj is not None and not is_owner(request.member, obj):\n            return False\n        return super().has_change_permission(request, obj)\n\n    def has_delete_permission(self, request, obj=None):\n        \"\"\"Only allow delete access if the user is an owner.\"\"\"\n        if obj is not None and not is_owner(request.member, obj):\n            return False\n        return super().has_delete_permission(request, obj)\n\n\n@admin.register(MiscellaneousDocument)\nclass MiscellaneousDocumentAdmin(ModelAdmin):\n    \"\"\"Manage the miscellaneous documents.\"\"\"\n\n    form = forms.MiscellaneousDocumentForm\n    list_filter = (\n        \"created\",\n        \"last_updated\",\n        \"members_only\",\n    )\n    list_display = (\n        \"__str__\",\n        \"members_only\",\n    )\n", "path": "website/documents/admin.py"}]}