Omit nil values when generating hashes for errors and warnings

Author: lgebhardt

lib/jsonapi/error.rb

@@ -18,6 +18,12 @@ def initialize(options = {})
       @status         = Rack::Utils::SYMBOL_TO_STATUS_CODE[options[:status]].to_s
       @meta           = options[:meta]
     end
+
+    def to_hash
+      hash = {}
+      instance_variables.each {|var| hash[var.to_s.delete('@')] = instance_variable_get(var) unless instance_variable_get(var).nil? }
+      hash
+    end
   end
 
   class Warning
@@ -31,5 +37,11 @@ def initialize(options = {})
                           options[:code]
                         end
     end
+
+    def to_hash
+      hash = {}
+      instance_variables.each {|var| hash[var.to_s.delete('@')] = instance_variable_get(var) unless instance_variable_get(var).nil? }
+      hash
+    end
   end
 end