admin export users to excel

Optimize database query when get user's name and contact email

seahub/views/sysadmin.py

@@ -296,13 +296,28 @@ def sys_useradmin_export_excel(request):
                 _("Space Usage") + "(MB)", _("Space Quota") + "(MB)",
                 _("Create At"), _("Last Login"), _("Admin"), _("LDAP(imported)"),]
 
+    # only operate 100 users for every `for` loop
+    looped = 0
+    limit = 100
     data_list = []
 
-    last_logins = UserLastLogin.objects.filter(username__in=[x.email for x in users])
-    for user in users:
+    while looped < len(users):
 
+        current_users = users[looped:looped+limit]
+
+        last_logins = UserLastLogin.objects.filter(username__in=[x.email \
+                for x in current_users])
+        user_profiles = Profile.objects.filter(user__in=[x.email \
+                for x in current_users])
+
+        for user in current_users:
             # populate name and contact email
-        populate_user_info(user)
+            user.contact_email = ''
+            user.name = ''
+            for profile in user_profiles:
+                if profile.user == user.email:
+                    user.contact_email = profile.contact_email
+                    user.name = profile.nickname
 
             # populate space usage and quota
             MB = get_file_size_unit('MB')
@@ -365,6 +380,9 @@ def sys_useradmin_export_excel(request):
 
             data_list.append(row)
 
+        # update `looped` value when `for` loop finished
+        looped += limit
+
     wb = write_xls('users', head, data_list)
     if not wb:
         messages.error(request, _(u'Failed to export Excel'))