From a9ce280fc472dcc22bfd48330adf2af87ec27546 Mon Sep 17 00:00:00 2001
From: Federico Ravasio <ravasio.federico@gmail.com>
Date: Fri, 22 Feb 2013 11:35:20 +0100
Subject: [PATCH] Nil parameter won't yield errors.

---
 lib/formulas.rb       | 2 +-
 spec/formulas_spec.rb | 9 +++++++++
 2 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/lib/formulas.rb b/lib/formulas.rb
index 7a45a1c..3ddbecf 100644
--- a/lib/formulas.rb
+++ b/lib/formulas.rb
@@ -11,7 +11,7 @@ def self.included(base)
   module ClassMethods
     def calculated_field(field)
       define_method("#{field}_calc") do
-        code = send(field)
+        code = send(field).to_s
         sandbox_run(field, code)
       end
 
diff --git a/spec/formulas_spec.rb b/spec/formulas_spec.rb
index f2b626a..1ac69ab 100644
--- a/spec/formulas_spec.rb
+++ b/spec/formulas_spec.rb
@@ -86,5 +86,14 @@ def initialize(params = {})
         subject.attr1_error.should == 'SyntaxError'
       end
     end
+
+    context 'nil parameter' do
+      subject{ SimpleAttributes.new(attr1: nil) }
+
+      it 'should not store any errors' do
+        subject.attr1_calc.should be_nil
+        subject.attr1_error.should be_nil
+      end
+    end
   end
 end