Rewrite custom validation

lib/validatable.js

@@ -10,17 +10,7 @@ Validatable.validatesNumericalityOf = getConfigurator('numericality');
 Validatable.validatesInclusionOf = getConfigurator('inclusion');
 Validatable.validatesExclusionOf = getConfigurator('exclusion');
 Validatable.validatesFormatOf = getConfigurator('format');
-Validatable.validate = function () {
-    args = [].slice.call(arguments);
-    var valFn = function () {}; // noop
-    if (typeof args[args.length - 1] === 'function'){
-        valFn = args.pop();
-    }
-    wrapperFn = function customValidator(attr, conf, err) {
-        return valFn.call(this, err);
-    };
-    configure(this, wrapperFn, args)
-};
+Validatable.validate = getConfigurator('custom');
 
 // implementation of validators
 var validators = {
@@ -77,13 +67,16 @@ var validators = {
         } else {
             err();
         }
+    },
+    custom: function (attr, conf, err) {
+        conf.customValidator.call(this, err);
     }
 };
 
 
-function getConfigurator(name) {
+function getConfigurator(name, opts) {
     return function () {
-        configure(this, name, arguments);
+        configure(this, name, arguments, opts);
     };
 }
 
@@ -124,6 +117,9 @@ function cleanErrors(inst) {
 function validationFailed(inst, v) {
     var attr = v[0];
     var conf = v[1];
+    var opts = v[2] || {};
+
+    if (typeof attr !== 'string') return false;
 
     // here we should check skip validation conditions (if, unless)
     // that can be specified in conf
@@ -131,8 +127,11 @@ function validationFailed(inst, v) {
     if (skipValidation(inst, conf, 'unless')) return false;
 
     var fail = false;
-    var validator = typeof conf.validation === "function" ? conf.validation : validators[conf.validation];
-    validator.call(inst, attr, conf, function onerror(kind) {
+    var validator = validators[conf.validation];
+    var validatorArguments = [];
+    validatorArguments.push(attr);
+    validatorArguments.push(conf);
+    validatorArguments.push(function onerror(kind) {
         var message;
         if (conf.message) {
             message = conf.message;
@@ -154,6 +153,7 @@ function validationFailed(inst, v) {
         inst.errors.add(attr, message);
         fail = true;
     });
+    validator.apply(inst, validatorArguments);
     return fail;
 }
 
@@ -221,7 +221,7 @@ function blank(v) {
     return false;
 }
 
-function configure(cls, validation, args) {
+function configure(cls, validation, args, opts) {
     if (!cls._validations) {
         Object.defineProperty(cls, '_validations', {
             writable: true,
@@ -237,9 +237,12 @@ function configure(cls, validation, args) {
     } else {
         conf = {};
     }
+    if (validation === 'custom' && typeof args[args.length - 1] === 'function') {
+        conf.customValidator = args.pop();
+    }
     conf.validation = validation;
     args.forEach(function (attr) {
-        cls._validations.push([attr, conf]);
+        cls._validations.push([attr, conf, opts]);
     });
 }
 
@@ -253,3 +256,4 @@ Errors.prototype.add = function (field, message) {
         this[field].push(message);
     }
 };
+

test/hookable_test.coffee

@@ -77,3 +77,4 @@ it "should trigger after destroy", (test)->
     test.done()
   User.create {}, (err, user)->
     user.destroy()
+

test/validations_test.coffee

@@ -214,16 +214,20 @@ it 'should validate format', (test) ->
 
     test.done()
 
-it 'should validate a field using a custom validator', (test)->
+it 'should validate a field using a custom validator', (test) ->
 
-    User.validate 'email', (err)-> err("crash") if @email.length is 0
+    validator = (err) ->
+        err('crash') if @name == 'bad name'
+
+    User.validate 'name', validator, message: crash: 'custom message'
 
     user = new User validAttributes
     test.ok user.isValid()
 
     user = new User validAttributes
-    user.email = ""
-    test.ok not user.isValid()
+    user.name = 'bad name'
+    test.ok not user.isValid(), 'invalid due custom name validator'
+    test.equal user.errors.name[0], 'custom message'
 
     test.done()