Use record_scope for creation in stead of record_class to preserve record_scope specifics current_user.user_filters in dunlop as example

lib/dunlop/ember/api_base_controller.rb

@@ -37,7 +37,7 @@ module Dunlop::Ember::ApiBaseController
   end
 
   def create
-    @record ||= record_class.new(record_params)
+    @record ||= record_scope.new(record_params)
     create_safeguard @record
     return if performed?
     if @record.save
@@ -189,6 +189,7 @@ module Dunlop::Ember::ApiBaseController
     self.class.predicate_end_matcher ||= Regexp.new("(_#{Ransack.predicates.keys.join('|_')})$")
     mapped_query = {}
     (params[:q] || {}).each do |key, value|
+      # not setting the matcher means equality
       key = "#{key}_eq" unless %w[s sorts].include?(key) or record_class.try(:ransackable_scopes).try(:include?, key.to_sym) or key =~ self.class.predicate_end_matcher # expect equality when no predicate is given
       if key =~ /^type_/
         # map type to sti_type