From 822a906f68664f61a1209336bb681077692c8475 Mon Sep 17 00:00:00 2001
From: zhouguangming <zhouguangming1989@gmail.com>
Date: Tue, 9 Apr 2013 17:04:47 +0800
Subject: [PATCH] Add nil! method for nil JSON

---
 lib/jbuilder.rb       | 11 ++++++++++-
 test/jbuilder_test.rb |  6 ++++++
 2 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/lib/jbuilder.rb b/lib/jbuilder.rb
index 728124a..f96bc99 100644
--- a/lib/jbuilder.rb
+++ b/lib/jbuilder.rb
@@ -73,6 +73,7 @@ def initialize(*args)
   BLANK = ::Object.new
 
   def set!(key, value = BLANK, *args, &block)
+
     result = if ::Kernel.block_given?
       if BLANK != value
         # json.comments @post.comments { |comment| ... }
@@ -256,6 +257,14 @@ def extract!(object, *attributes)
     end
   end
 
+  # Returns the nil JSON.
+  def nil!
+    @attributes = nil
+  end
+
+  alias_method :null!, :nil!
+
+
   def call(object = nil, *attributes)
     if attributes.empty?
       array! object, &::Proc.new
@@ -310,4 +319,4 @@ def _merge(hash_or_array)
 end
 
 require 'jbuilder/jbuilder_template' if defined?(ActionView::Template)
-require 'jbuilder/railtie' if defined?(Rails::VERSION::MAJOR) && Rails::VERSION::MAJOR == 4
\ No newline at end of file
+require 'jbuilder/railtie' if defined?(Rails::VERSION::MAJOR) && Rails::VERSION::MAJOR == 4
diff --git a/test/jbuilder_test.rb b/test/jbuilder_test.rb
index 154f814..de486e0 100644
--- a/test/jbuilder_test.rb
+++ b/test/jbuilder_test.rb
@@ -571,4 +571,10 @@ def empty?
     assert_equal ['name'], json.attributes!.keys
     Jbuilder.send(:class_variable_set, '@@ignore_nil', false)
   end
+
+  test "nil!" do
+    json = Jbuilder.new
+    json.nil!
+    assert_equal nil, json.attributes!
+  end
 end