diff --git a/lib/representable.rb b/lib/representable.rb
index d779b9db..6e6ac90b 100644
--- a/lib/representable.rb
+++ b/lib/representable.rb
@@ -87,7 +87,12 @@ def normalize_options(options)
     child_options[:wrap] = binding[:wrap] unless binding[:wrap].nil?
 
     # nested params:
-    child_options.merge!(options[binding.name.to_sym]) if options[binding.name.to_sym]
+    if nested_options = options[binding.name.to_sym] || options[binding.name.to_s]
+      child_options.merge!(nested_options)
+      if nested_options.key?("user_options")
+        child_options[:user_options].merge!(nested_options["user_options"])
+      end
+    end
     child_options
   end
 
diff --git a/lib/representable/populator.rb b/lib/representable/populator.rb
index db0edb97..85d09577 100644
--- a/lib/representable/populator.rb
+++ b/lib/representable/populator.rb
@@ -5,14 +5,6 @@ class Populator
 
       object_class = binding[:class].(input, options)
       object       = object_class.find_by(id: input["id"]) || object_class.new
-      if options[:binding].array?
-        # represented.songs[i] = model
-        options[:represented].send(binding.getter)[options[:index]] = object
-      else
-        # represented.song = model
-        options[:represented].send(binding.setter, object)
-      end
-
       object
      }
 
@@ -23,7 +15,6 @@ def self.apply!(options)
 
       options[:parse_pipeline] = ->(input, options) do
         pipeline = Pipeline[*parse_functions] # TODO: AssignFragment
-        pipeline = Pipeline::Insert.(pipeline, SetValue, delete: true) # remove the setter function.
         pipeline = Pipeline::Insert.(pipeline, populator, replace: CreateObject::Populator) # let the actual populator do the job.
         # puts pipeline.extend(Representable::Pipeline::Debug).inspect
         pipeline
diff --git a/representable.gemspec b/representable.gemspec
index d9a34f7c..62e90c66 100644
--- a/representable.gemspec
+++ b/representable.gemspec
@@ -27,7 +27,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "rake"
   spec.add_development_dependency "test_xml", "0.1.6"
   spec.add_development_dependency "minitest"
-  spec.add_development_dependency "mongoid"
+  spec.add_development_dependency "mongoid", "~> 5.1.4"
   spec.add_development_dependency "virtus"
   spec.add_development_dependency "json", '>= 1.7.7'