Initial impl.

changelog.md

-# v2.0.0 #
-- [DEPENDENCIES] upgrade mysql to alpha7. You *MUST* use this version or newer for DATETIMEs to work
-
 # v1.6.0 #
 # v1.6.0 #
+- [DEPENDENCIES] upgrade mysql to alpha7. You *MUST* use this version or newer for DATETIMEs to work
 - [DEPENDENCIES] upgraded most dependencies. most important: mysql was upgraded to 2.0.0-alpha-3
 - [DEPENDENCIES] upgraded most dependencies. most important: mysql was upgraded to 2.0.0-alpha-3
 - [DEPENDENCIES] mysql is now an optional dependency. #355 (thanks to clkao)
 - [DEPENDENCIES] mysql is now an optional dependency. #355 (thanks to clkao)
 - [REFACTORING] separated tests for dialects
 - [REFACTORING] separated tests for dialects
@@ -40,6 +38,7 @@
 - [FEATURE] add increment and decrement methods on dao. #408 (thanks to janmeier/innofluence)
 - [FEATURE] add increment and decrement methods on dao. #408 (thanks to janmeier/innofluence)
 - [FEATURE] unified the result of describeTable
 - [FEATURE] unified the result of describeTable
 - [FEATURE] add support for decimals (thanks to alexyoung)
 - [FEATURE] add support for decimals (thanks to alexyoung)
+- [FEATURE] added DAO.refresh(), which updates the attributes of the DAO in-place (as opposed to doing having to do a find() and returning a new model)
 
 
 # v1.5.0 #
 # v1.5.0 #
 - [REFACTORING] use underscore functions for Utils.isHash (thanks to Mick-Hansen/innofluence)
 - [REFACTORING] use underscore functions for Utils.isHash (thanks to Mick-Hansen/innofluence)

lib/dao.js

@@ -151,6 +151,17 @@ module.exports = (function() {
     }
     }
   }
   }
 
 
+ /*
+  * Refresh the current instance in-place, i.e. update the object with current data from the DB and return the same object.
+  * This is different from doing a `find(DAO.id)`, because that would create and return a new object. With this method,
+  * all references to the DAO are updated with the new data and no new objects are created.
+  *
+  * @return {Object}         A promise which fires `success`, `error`, `complete` and `sql`.
+  */
+  DAO.prototype.reload = function() {
+    return this.QueryInterface.reload(this, this.__factory.tableName);
+  }
+
   /*
   /*
    * Validate this dao's attribute values according to validation rules set in the dao definition.
    * Validate this dao's attribute values according to validation rules set in the dao definition.
    *
    *

lib/query-interface.js

@@ -225,6 +225,36 @@ module.exports = (function() {
     return queryAndEmit.call(this, [sql, dao], 'increment');
     return queryAndEmit.call(this, [sql, dao], 'increment');
   }
   }
 
 
+  QueryInterface.prototype.reload = function(dao, tableName) {
+    var self = this
+
+    return new Utils.CustomEventEmitter(function(emitter) {
+      var sql = self.QueryGenerator.selectQuery(tableName, { id : dao.id, limit: 1 })
+        , calleeStub = { 
+          build: function (values) {
+            // We cannot use setAttributes here, since a refresh might also update the read only attributes
+            Utils._.each(values, function(value, attr) {
+              (dao.attributes.indexOf(attr) > -1) && (dao[attr] = value)
+            })
+          }
+        }
+        , qry = self.sequelize.query(sql, calleeStub, { plain: true, raw: false, type: 'SELECT' })
+
+      qry
+        .success(function () {
+          self.emit('refresh', null)
+          emitter.emit('success', dao)
+        })
+        .error(function(err) {
+          self.emit('refresh', err)
+          emitter.emit('error', err)
+        })
+        .on('sql', function(sql) {
+          emitter.emit('sql', sql)
+        })
+    }).run()
+  }
+
   QueryInterface.prototype.rawSelect = function(tableName, options, attributeSelector) {
   QueryInterface.prototype.rawSelect = function(tableName, options, attributeSelector) {
     var self = this
     var self = this
 
 

spec/dao.spec.js

@@ -216,6 +216,63 @@ describe(Helpers.getTestDialectTeaser("DAO"), function() {
     });
     });
   });
   });
 
 
+  describe('refresh', function () {
+    it("should return a refrence to the same DAO instead of creating a new one", function (done) {
+      this.User.create({ username: 'John Doe' }).done(function (err, originalUser) {
+
+        originalUser.updateAttributes({ username: 'Doe John' }).done(function () {
+          originalUser.reload().done(function (err, updatedUser) {
+            expect(originalUser === updatedUser).toBeTrue()
+            done();
+          })
+        })
+      })
+    })
+
+    it("should update the values on all references to the DAO", function (done) {
+      var self = this
+
+      this.User.create({ username: 'John Doe' }).done(function (err, originalUser) {
+        self.User.find(originalUser.id).done(function (err, updater) {
+          updater.updateAttributes({ username: 'Doe John' }).done(function () {
+            // We used a different refernce when calling updateAttributes, so originalUser is now out of sync
+            expect(originalUser.username).toEqual('John Doe')
+
+            originalUser.reload().done(function (err, updatedUser) {
+              expect(originalUser.username).toEqual('Doe John')
+              expect(updatedUser.username).toEqual('Doe John')
+
+              done();
+            })
+          })
+        })        
+      })
+    })
+
+    it("should update read only attributes as well (updatedAt)", function (done) {
+      var self = this
+      this.timeout = 2000;
+
+      this.User.create({ username: 'John Doe' }).done(function (err, originalUser) {
+        var originallyUpdatedAt = originalUser.updatedAt
+
+        // Wait for a second, so updatedAt will actually be different
+        setTimeout(function () {
+          self.User.find(originalUser.id).done(function (err, updater) {
+            updater.updateAttributes({ username: 'Doe John' }).done(function () {
+              originalUser.reload().done(function (err, updatedUser) {
+                expect(originalUser.updatedAt).toBeGreaterThan(originallyUpdatedAt)
+                expect(updatedUser.updatedAt).toBeGreaterThan(originallyUpdatedAt)
+
+                done();
+              })
+            })
+          })
+        }, 1000)
+      })
+    })
+  });
+
   describe('default values', function() {
   describe('default values', function() {
     describe('current date', function() {
     describe('current date', function() {
       it('should store a date in touchedAt', function() {
       it('should store a date in touchedAt', function() {