Allows changing of push behavior for different operation types

lib/userlist/rails.rb

@@ -75,11 +75,13 @@ def self.setup_callbacks(model, scope)
       model.instance_variable_set(:@userlist_callbacks_registered, true)
     end
 
-    def self.setup_callback(type, model, scope, method)
+    def self.setup_callback(type, model, scope, default_method)
       return unless callback_method = [:after_commit, :"after_#{type}"].find { |m| model.respond_to?(m) }
 
       callback = lambda do
         begin
+          method = try(:"userlist_#{type}_behavior") || default_method
+
           relation = Userlist::Push.public_send(scope)
           relation.public_send(method, self)
         rescue Userlist::Error => e

spec/userlist/rails_spec.rb

@@ -26,19 +26,32 @@
     end
 
     context 'when the user is updated' do
+      let(:model) { model_class.create }
+
       it 'should push the user' do
-        model = model_class.create
         expect(Userlist::Push.users).to receive(:push).with(model)
         model.save
       end
     end
 
     context 'when the user is destroyed' do
+      let(:model) { model_class.create }
+
       it 'should delete the user' do
-        model = model_class.create
         expect(Userlist::Push.users).to receive(:delete).with(model)
         model.destroy
       end
+
+      context 'when the destroy behavior is push' do
+        before do
+          model.define_singleton_method(:userlist_destroy_behavior) { :push }
+        end
+
+        it 'should push the user' do
+          expect(Userlist::Push.users).to receive(:push).with(model)
+          model.save
+        end
+      end
     end
 
     context 'when the callbacks are set up multiple times' do