lib/parametron.rb in parametron-0.2.0 vs lib/parametron.rb in parametron-0.2.2

@@ -24,11 +24,11 @@
     def method_added(name)
       return if name != @_method_name or instance_variable_get(:"@_METHOD_#{name}_WRAPPED")
       instance_variable_set(:"@_METHOD_#{name}_WRAPPED", true)
       original = instance_method(name.to_sym)
       remove_method(name.to_sym)
-      define_method(name) do |params|
+      define_method(name) do |params={}|
         new_params = _rename_params!(_validate!(_set_defaults!(params)))
         original.bind(self).call(new_params)
       end
     end
   end
@@ -47,10 +47,16 @@
     new_par = params.dup
     _validators_list.each do |v|
       if new_par[v.name].nil? && new_par[v.name.to_sym].nil?
         case v.default
         when nil  then next
-        when Proc then new_par[v.name.to_sym] = v.default.call(self)
+        when Proc
+          case v.default.arity
+          when 0 then new_par[v.name.to_sym] = v.default.call()
+          when 1 then new_par[v.name.to_sym] = v.default.call(self)
+          else
+            raise ArgumentError.new "Too much arguments for #{v.name} default lambda"
+          end
         else
           new_par[v.name.to_sym] = v.default
         end
       end
     end