docs about router

Readme.md

@@ -5,6 +5,7 @@
 * [Quick Start](#quickstart)
     * [Connect easier](#quickstart-1)
     * [Server options and BSON options](#quickstart-2)
+    * [Router](#router)
     * [Similar API with node-mongodb-native](#quickstart-3)
     * [Cursor easier](#quickstart-4)
     * [MVC helper](#quickstart-5)
@@ -93,6 +94,22 @@ And native_parser options will automatically set from wheather native_parser ava
     var mongo = require('mongoskin'),
         db = mongo.db('localhost:27017/test?auto_reconnect');
 
+<a name='router'></a>
+
+    var db = mongo.router(function(coll_name){
+        switch(coll_name) {
+        case 'user':
+        case 'message':
+          return mongo.db('192.168.1.3/auth_db');
+        default:
+          return mongo.db('192.168.1.2/app_db');
+        }
+    });
+    db.bind('user', require('./shared-user-methods'));
+    var users = db.user; //auth_db.user
+    var messages = db.collection('message'); // auth_db.message
+    var products = db.collection('product'); //app_db.product
+
 <a name='quickstart-3'></a>
 
 Similar API with node-mongodb-native
@@ -201,6 +218,10 @@ Create [SkinServer](#skinserver) of native [ServerCluster](https://github.com/ch
 
 Create [SkinServer](#skinserver) of native [ServerPair](https://github.com/christkv/node-mongodb-native/blob/master/lib/mongodb/connection.js#L190)
 
+### router(select)
+
+select is function(collectionName) returns a database instance, means router collectionName to that database.
+
 [Back to index](#index)
 
 <a name='skinserver'>