Fixed issue where a source hash key can be used in translating multip…

CHANGELOG.md

@@ -42,6 +42,7 @@ Any violations of this scheme are considered to be bugs.
 * [#531](https://github.com/hashie/hashie/pull/531): Fixed [slice doesn't work using symbols](https://github.com/hashie/hashie/issues/529) using hash with `IndifferentAccess` extension - [@gnomex](https://github.com/gnomex).
 * [#533](https://github.com/hashie/hashie/pull/533): Fixed `NoMethodError: undefined method `to_json'` at `hashie/dash_spec` - [@gnomex](https://github.com/gnomex).
 * [#537](https://github.com/hashie/hashie/pull/537): Fixed inconsistencies with handling defaults in `Dash` with and without `IgnoreUnclared` mixed in - [@michaelherold](https://github.com/michaelherold).
+* [#547](https://github.com/hashie/hashie/pull/547): Fixed issue where a source hash key can be used in translating multiple properties - [@danwa5](https://github.com/danwa5).
 * Your contribution here.
 
 ### Security

lib/hashie/extensions/dash/property_translation.rb

@@ -153,7 +153,12 @@ module InstanceMethods
           def []=(property, value)
             if self.class.translation_exists? property
               send("#{property}=", value)
-              super(property, value) if self.class.properties.include?(property)
+
+              if self.class.transformation_exists? property
+                super property, self.class.transformed_property(property, value)
+              elsif self.class.properties.include?(property)
+                super(property, value)
+              end
             elsif self.class.transformation_exists? property
               super property, self.class.transformed_property(property, value)
             elsif property_exists? property

spec/hashie/trash_spec.rb

@@ -157,6 +157,23 @@ class SomeDataModel < Hashie::Trash
     end
   end
 
+  describe 'translating multiple properties from the same source hash key' do
+    class AnotherDataModel < Hashie::Trash
+      property :first_name,                          transform_with: ->(n) { n.upcase }
+      property :first_name_short, from: :first_name, transform_with: ->(n) { n[0, 3] }
+    end
+
+    subject { AnotherDataModel.new(first_name: 'Cathy') }
+
+    it 'translates the first key with the given lambda' do
+      expect(subject.first_name).to eq('CATHY')
+    end
+
+    it 'translates the second key with the given lambda and the initial value of the first key' do
+      expect(subject.first_name_short).to eq('Cat')
+    end
+  end
+
   describe 'uses with or transform_with interchangeably' do
     class TrashLambdaTestTransformWith < Hashie::Trash
       property :first_name, from: :firstName, transform_with: ->(value) { value.reverse }