fix resolution of fragments where part of the path is an array, which can't be instantiated as a JSON::Schema

Author: notEthan

lib/json-schema/validator.rb

@@ -90,16 +90,19 @@ def schema_from_fragment(base_schema, fragment)
           if !base_schema.has_key?(f)
             raise JSON::Schema::SchemaError.new("Invalid fragment resolution for :fragment option")
           end
-          base_schema = JSON::Schema.new(base_schema[f],schema_uri,@options[:version])
+          base_schema = base_schema[f]
         elsif base_schema.is_a?(Array)
           if base_schema[f.to_i].nil?
             raise JSON::Schema::SchemaError.new("Invalid fragment resolution for :fragment option")
           end
-          base_schema = JSON::Schema.new(base_schema[f.to_i],schema_uri,@options[:version])
+          base_schema = base_schema[f.to_i]
         else
           raise JSON::Schema::SchemaError.new("Invalid schema encountered when resolving :fragment option")
         end
       end
+      unless base_schema.is_a?(JSON::Schema)
+        base_schema = JSON::Schema.new(base_schema,schema_uri,@options[:version])
+      end
 
       if @options[:list]
         base_schema.to_array_schema