Make all bindings hold reference to the actual key at which the model resides on the view.

This allows us to update the bindings' model property according to the
models currently set on the view.

@@ -14,7 +14,7 @@ class Rivets.Binding
   # All information about the binding is passed into the constructor; the
   # containing view, the DOM node, the type of binding, the model object and the
   # keypath at which to listen for changes.
-  constructor: (@view, @el, @type, @model, @keypath, @options = {}) ->
+  constructor: (@view, @el, @type, @key, @keypath, @options = {}) ->
     unless @binder = @view.binders[type]
       for identifier, value of @view.binders
         if identifier isnt '*' and identifier.indexOf('*') isnt -1
@@ -25,11 +25,9 @@ class Rivets.Binding
             @args.shift()
 
     @binder or= @view.binders['*']
-
-    if @binder instanceof Function
-      @binder = {routine: @binder}
-
+    @binder = {routine: @binder} if @binder instanceof Function
     @formatters = @options.formatters || []
+    @model = @view.models[@key]
 
   # Applies all the current formatters to the supplied value and returns the
   # formatted value.
@@ -182,17 +180,17 @@ class Rivets.View
             options.formatters = pipes
             options.bypass = path.indexOf(':') != -1
             if splitPath[0]
-              model = @models[splitPath.shift()]
+              key = splitPath.shift()
             else
-              model = @models
+              key = null
               splitPath.shift()
             keypath = splitPath.join '.'
 
-            if model
+            if @models[key]?
               if dependencies = context.shift()
                 options.dependencies = dependencies.split /\s+/
 
-              @bindings.push new Rivets.Binding @, node, type, model, keypath, options
+              @bindings.push new Rivets.Binding @, node, type, key, keypath, options
 
         attributes = null if attributes