the data structure used to store attribute aliases should not be exposed

activemodel/lib/active_model/attribute_methods.rb

@@ -218,6 +218,16 @@ def alias_attribute(new_name, old_name)
         end
       end
 
+      # Is +new_name+ an alias?
+      def attribute_alias?(new_name)
+        attribute_aliases.key? new_name.to_s
+      end
+
+      # Returns the original name for the alias +name+
+      def attribute_alias(name)
+        attribute_aliases[name.to_s]
+      end
+
       # Declares the attributes that should be prefixed and suffixed by
       # ActiveModel::AttributeMethods.
       #

activerecord/lib/active_record/relation/predicate_builder.rb

@@ -6,8 +6,8 @@ def self.build_from_hash(klass, attributes, default_table)
       attributes.each do |column, value|
         table = default_table
 
-        if column.is_a?(Symbol) && klass.attribute_aliases.key?(column.to_s)
-          column = klass.attribute_aliases[column.to_s]
+        if column.is_a?(Symbol) && klass.attribute_alias?(column)
+          column = klass.attribute_alias(column.to_s)
         end
 
         if value.is_a?(Hash)