allow arguments passed through the custom chains

README.md

@@ -591,7 +591,8 @@ Person.getById(connection, 1, function(err, person) {
 
 Creates a custom method that is a composition of clauses. Only supports 
 clauses - where, orderBy, etc. Trying to chain a method that returns results
-(all, first, min, etc.) will not work.
+(all, first, min, etc.) will not work. This is set to refer to the query
+you're constructing.
 
 __Arguments__
 
@@ -600,12 +601,12 @@ __Arguments__
 
 __Example__
 ```javascript
-Person.defineClause('clauseName', function(query) {
-  return query.where('id < 5').orderBy('id').limit(5);
+Person.defineClause('clauseName', function(arg1, arg2, ...) {
+  return this.where('id < ?', arg1).orderBy('id').limit(5);
 });
 
 Person.clauseName().all(connection, function(err, people) {
-  // All the people with id > 5, ordered by id and limited to 5
+  // All the people with id < arg1, ordered by id and limited to 5
 });
 ```
 <a name="modelOnSave" />

lib/model.js

@@ -236,8 +236,7 @@ exports.define = function (name, columnDefs, opts) {
     // add it to the model
     Model[name] = function() {
       var query = this.using(null);
-      chainFn(query);
-      return query;
+      return chainFn.apply(query, arguments);
     };
 
     Model[name] = persistUtil.bind(name, Model[name], Model);

lib/query.js

@@ -45,7 +45,7 @@ Query.prototype._defineCustomClauses = function() {
     var chainFn = customClauses[name];
 
     this[name] = function() {
-      return chainFn(this);
+      return chainFn.apply(this, arguments);
     };
   }
 }

test/chain.js

@@ -18,8 +18,8 @@ exports['Chain'] = nodeunit.testCase({
       "age": type.INTEGER
     }).hasMany(this.Phone);
 
-    this.Person.defineClause('testClause', function(query) {
-      return query.where('age = ?', 21).where('name like "%Bob%"');
+    this.Person.defineClause('testClause', function(age) {
+      return this.where('age = ?', age || 21).where('name like "%Bob%"');
     });
 
     testUtils.connect(persist, {}, function(err, connection) {
@@ -66,7 +66,7 @@ exports['Chain'] = nodeunit.testCase({
       self.Phone.all,
       self.Person.first,
       persist.runSqlAll('SELECT * FROM People'),
-      self.Person.testClause().all,
+      self.Person.testClause(21).all,
       self.Person.limit(5).testClause().all,
     ], function(err, results) {
       if (err) {