Remove save after adding an association with <<

`<<` operator already save the the association to the database

engines/dfc_provider/app/controllers/dfc_provider/enterprise_groups/affiliated_by_controller.rb

@@ -17,8 +17,6 @@ module DfcProvider
 
         group.enterprises << enterprise
 
-        return head :unprocessable_entity unless group.save
-
         head :created
       end
 

engines/dfc_provider/spec/requests/enterprise_groups/affiliated_by_spec.rb

@@ -82,7 +82,6 @@ describe "EnterpriseGroups::AffiliatedBy", type: :request, swagger_doc: "dfc.yam
       response "204", "no content" do
         before do
           group.enterprises << enterprise2
-          group.save!
         end
 
         it "removes enterperise from group" do |example|