From 803bec0fdf32d3b6287a1152f21c32ed8a660d8a Mon Sep 17 00:00:00 2001
From: Sameer Tilak <sameert@joshsoftware.com>
Date: Thu, 6 Mar 2014 16:35:02 +0530
Subject: [PATCH] Updated READ.me with conditional counter example.

---
 README.md | 40 +++++++++++++++++++++++++++++++++++++---
 1 file changed, 37 insertions(+), 3 deletions(-)

diff --git a/README.md b/README.md
index 976e9b6..f404c03 100644
--- a/README.md
+++ b/README.md
@@ -61,13 +61,47 @@ If you do not wish to use the `model_count` naming convention, you can override
 counter_cache :library, :field => "total_amount_of_books"
 ````
 
+
+### Conditional Counter
+
+If you want to maintain counter based on certain condition, then you can specify it using `:if`
+
+````rb
+class Post 
+  include Mongoid::Document
+
+  field :article
+  field :comment_count
+
+  has_many :comments
+
+end
+````
+Then in the referrenced/Embedded document, add condition for counter using `:if`
+
+````rb
+class Comment
+  include Mongoid::Document
+  include Mongoid::MagicCounterCache
+
+  belongs_to :post
+
+  field :remark
+  field :is_published, type: Boolean, default: false
+
+  counter_cache :post, :if => Proc.new { |act| (act.is_published)  }
+end
+````
+
+comment_count will get incremented / decremented only when `:if` condition returns `true`
+
 ## TODO
 
-  1. Add additional options parameters
-  2. Simplify syntax (I.E. including MagicCounterCache will add counts for all `belongs_to` associations on a document
+1. Add additional options parameters
+2. Simplify syntax (I.E. including MagicCounterCache will add counts for all `belongs_to` associations on a document
 
 
 
 ## CONTRIBUTE
 
-If you'd like to contribute, feel free to fork and merge until your heart is content
+    If you'd like to contribute, feel free to fork and merge until your heart is content