Django Admin Interface upgrades (#2090)

* update django admin interface to make it easier to manage spam

* add option to export email and username of organizers as a CSV file  or JSON

* add option to export email and username of queue owners as a CSV file  or JSON

* use raw_id_fields to make django admin pages load much faster

* make file size human readable

* re-arranged the fieldsets of some admin pages to be easier to navigate

* add small description about size (bytes of GB); limit text length displayed in list displays

* add custom text in list filter

* make some filter clearer: remove useless repetitions

* add export option for users

* fix typo

---------

Co-authored-by: Obada Haddad <obada.haddad@lisn.fr>

Author: ObadaS

src/apps/announcements/admin.py

@@ -1,6 +1,26 @@
 from django.contrib import admin
-
 from . import models
 
-admin.site.register(models.Announcement)
-admin.site.register(models.NewsPost)
+
+class NewsPostExpansion(admin.ModelAdmin):
+    list_display = ["id", "title", "link"]
+    list_display_links = ["id", "title"]
+    search_fields = ["id", "title", "link"]
+
+
+class AnnouncementExpansion(admin.ModelAdmin):
+    list_display = ["id", "text_limited"]
+    list_display_links = ["id", "text_limited"]
+
+    @admin.display(description="text", ordering="text")
+    def text_limited(self, obj):
+        if not obj.text:
+            return "-"
+        if len(obj.text) > 500:
+            return obj.text[:500] + "(...)"
+        else:
+            return obj.text[:500]
+
+
+admin.site.register(models.Announcement, AnnouncementExpansion)
+admin.site.register(models.NewsPost, NewsPostExpansion)