close #3 properly use args if tmp_args not passed

CHANGELOG.md

@@ -0,0 +1,3 @@
+## 0.1.0
+
+- Fix #3 properly use args if tmp_args not passed

lib/method_cacheable.rb

@@ -143,8 +143,8 @@ def for(method , *args)
     #   cache.method = "foo"              # => "foo"
     #   cache.key                         # => "users:foo:263619"
     def key(tmp_method = nil, *tmp_args)
-      tmp_method  ||= method
-      tmp_args    ||= args
+      tmp_method  = method if tmp_method.blank?
+      tmp_args    = args   if tmp_args.blank?
       key_method = "#{tmp_method}_key".to_sym
       key = caller.send key_method, *tmp_args if caller.respond_to? key_method
       key ||= caller.build_key(:name => tmp_method, :args => tmp_args)

spec/method_cacheable/method_cache_spec.rb

@@ -24,6 +24,13 @@
     it 'returns the key' do
       user.cache.key(:foo).should == "users:foo:#{user.id}"
     end
+
+    it 'returns the key after specifying args and method' do
+      cache = user.cache
+      cache.method = "foo#{@uniq}"
+      cache.args   = [1]
+      cache.key.should == "users:foo#{@uniq}:#{user.id}:1"
+    end
   end
 
   describe 'exists?' do