diff --git a/lib/groupify/adapter/mongoid/group.rb b/lib/groupify/adapter/mongoid/group.rb
index 5883315..60c14c8 100644
--- a/lib/groupify/adapter/mongoid/group.rb
+++ b/lib/groupify/adapter/mongoid/group.rb
@@ -140,7 +140,7 @@ def merge!(source_group, destination_group)
 
         module MemberAssociationExtensions
           def as(membership_type)
-            membership_type.present? ? where(:group_memberships.elem_match => {as: membership_type, group_ids: [base.id]}) : self
+            membership_type.present? ? where(:group_memberships.elem_match => {as: membership_type, group_ids: [_base.id]}) : self
           end
 
           def destroy(*members)
@@ -152,16 +152,12 @@ def delete(*members)
 
             if membership_type.present?
               members.each do |member|
-                member.group_memberships.as(membership_type).first.groups.delete(base)
+                member.group_memberships.as(membership_type).first.groups.delete(_base)
               end
             else
               members.each do |member|
-                member.group_memberships.in(groups: base).each do |membership|
-                  membership.groups.delete(base)
-                end
+                member.groups.destroy _base
               end
-
-              super(*members)
             end
           end
         end