Bug-fix for Struct member field access.

CHANGELOG.md

@@ -1,6 +1,9 @@
 Unreleased Changes
 ------------------
 
+* Bug-fix, when accessing Struct objects with an invalid member
+  `nil` is now returned, instead of raising an error.
+
 1.0.0 (2014-10-28)
 ------------------
 

lib/jmespath/tree_interpreter.rb

@@ -21,10 +21,11 @@ def dispatch(node, value)
       case node[:type]
 
       when :field
+        # hash_like?
         key = node[:key]
         case value
         when Hash then value.key?(key) ? value[key] : value[key.to_sym]
-        when Struct then value[key]
+        when Struct then value.respond_to?(key) ? value[key] : nil
         else nil
         end
 

spec/indifferent_access_spec.rb

@@ -18,6 +18,15 @@ module JMESPath
         expect(JMESPath.search('foo.bar.yuck', data)).to eq('abc')
       end
 
+      it 'does not raise an error when accessing non-valid struct members' do
+        data = Struct.new(:foo).new(
+          Struct.new(:bar).new(
+            Struct.new(:yuck).new('abc')
+          )
+        )
+        expect(JMESPath.search('foo.baz.yuck', data)).to be(nil)
+      end
+
     end
   end
 end