dynamic key retrieval

README.md

@@ -272,12 +272,25 @@ class User extends Orpheus
 user = User.create()
 user('jackson')
   .monthly_ranking.incrby(1, 'Midnight Oil - The Dead Heart')
-  .err ->
-    res.json status: 400
   .exec ->
     res.json status: 200
 ```
 
+Using arguments in dyanmic keys is easy:
+
+```coffee
+@zset 'monthly_ranking'
+  key: (year, month) ->
+    "ranking:#{year || d.getFullYear()}:#{month || d.getMonth()+1}"
+
+# later on, in a far away place...
+user('bean')
+  .monthly_ranking.incrby(1, 'Stoned Jesus - I'm The Mountain', key: [2012, 12])
+```
+
+Everything inside the `key` object will be passed to the dynamic key function.
+
+
 ## One to One Maps
 
 Maps are used to map between a unique attribute of the model and the model ID.

lib/orpheus.coffee

@@ -270,13 +270,17 @@ class OrpheusAPI
 		@operations = ['add', 'set', 'del']
 		for f in @operations
 			@_add_op f
-	
+
 
 	_create_command: (key, value, f) ->
 		type = value.type
 
 		@[key][f] = (args...) =>
 
+			# Pop out dynamic key arguments, if any
+			if _.isObject(args[args.length-1]) and args[args.length-1].key
+				dynamic_key_args = args.pop().key
+
 			# Type Conversion
 			# ------------------------
 			# Convert types for all the commands
@@ -306,7 +310,7 @@ class OrpheusAPI
 						return
 
 			# Add multi command
-			@_commands.push _.flatten [f, @_get_key(key), args]
+			@_commands.push _.flatten [f, @_get_key(key, dynamic_key_args), args]
 
 			# Response Schema
 			# --------------------
@@ -375,7 +379,7 @@ class OrpheusAPI
 		"#{host}#{pid}#{time}#{counter}#{random}"
 
 
-	_get_key: (key) ->
+	_get_key: (key, dynamic_key_args) ->
 		# Default: orpheus:pl:15
 		k = "#{@prefix}:#{@q}:#{@id}"
 
@@ -393,7 +397,7 @@ class OrpheusAPI
 		# generate a new key name, if it has a
 		# dynamic key function.
 		if key and @model[key].options.key
-			key = @model[key].options.key()
+			key = @model[key].options.key.apply(this, dynamic_key_args)
 
 		if type is 'str' or type is 'num'
 			# orpheus:us:15:name somename

test/orpheus.spec.coffee

@@ -91,6 +91,30 @@ describe 'Redis Commands', ->
 
 					done()
 
+	it 'Dynamic Keys Arguments', (done) ->
+		class User extends Orpheus
+			constructor: ->
+				@str 'name',
+					key: (var1, var2) ->
+						var1 ||= 'hello'
+						var2 ||= 'sup'
+						"#{var1}:#{var2}"
+		user = User.create()
+
+		user('hello')
+			.name.set('shalom')
+			.exec ->
+				r.hget "#{PREFIX}:us:hello", "hello:sup", (err, res) ->
+					expect(res).toBe 'shalom'
+
+					user('hiho')
+						.name.set('shalom', key: ['what', 'is'])
+						.exec ->
+
+							r.hget "#{PREFIX}:us:hiho", "what:is", (err, res) ->
+								expect(res).toBe 'shalom'
+								done()
+
 	it 'Num and Str single commands', (done) ->
 		class Player extends Orpheus
 			constructor: ->