Support relationships between classes with a common module parent

README.md

@@ -1329,6 +1329,7 @@ just as accessible to the Ruby world as MongoDB.
 Also, without contributors the project wouldn't be nearly as awesome. So
 many thanks to:
 
+* [Josh Menden](https://github.com/joshmenden)
 * [Logan Bowers](https://github.com/loganb)
 * [Lane LaRue](https://github.com/luxx)
 * [Craig Heneveld](https://github.com/cheneveld)

lib/dynamoid/associations/belongs_to.rb

@@ -39,8 +39,14 @@ def associate(hash_key)
       #
       # @since 0.2.0
       def target_association
-        has_many_key_name = options[:inverse_of] || source.class.to_s.underscore.pluralize.to_sym
+        has_many_key_name = options[:inverse_of] || source.class.to_s.pluralize.underscore.to_sym
         has_one_key_name = options[:inverse_of] || source.class.to_s.underscore.to_sym
+
+        if target_class.module_parent != Object && (target_class.module_parent == source.class.module_parent)
+          has_many_key_name = source.class.to_s.demodulize.pluralize.underscore.to_sym
+          has_one_key_name = source.class.to_s.demodulize.underscore.to_sym
+        end
+
         unless target_class.associations[has_many_key_name].nil?
           return has_many_key_name if target_class.associations[has_many_key_name][:type] == :has_many
         end

lib/dynamoid/associations/has_and_belongs_to_many.rb

@@ -15,6 +15,11 @@ class HasAndBelongsToMany
       # @since 0.2.0
       def target_association
         key_name = options[:inverse_of] || source.class.to_s.pluralize.underscore.to_sym
+
+        if target_class.module_parent != Object && (target_class.module_parent == source.class.module_parent)
+          key_name = source.class.to_s.demodulize.pluralize.underscore.to_sym
+        end
+
         guess = target_class.associations[key_name]
         return nil if guess.nil? || guess[:type] != :has_and_belongs_to_many
 

lib/dynamoid/associations/has_many.rb

@@ -15,6 +15,11 @@ class HasMany
       # @since 0.2.0
       def target_association
         key_name = options[:inverse_of] || source.class.to_s.singularize.underscore.to_sym
+
+        if target_class.module_parent != Object && (target_class.module_parent == source.class.module_parent)
+          key_name = source.class.to_s.demodulize.singularize.underscore.to_sym
+        end
+
         guess = target_class.associations[key_name]
         return nil if guess.nil? || guess[:type] != :belongs_to
 

lib/dynamoid/associations/has_one.rb

@@ -16,6 +16,11 @@ class HasOne
       # @since 0.2.0
       def target_association
         key_name = options[:inverse_of] || source.class.to_s.singularize.underscore.to_sym
+
+        if target_class.module_parent != Object && (target_class.module_parent == source.class.module_parent)
+          key_name = source.class.to_s.demodulize.singularize.underscore.to_sym
+        end
+
         guess = target_class.associations[key_name]
         return nil if guess.nil? || guess[:type] != :belongs_to