use defaultValue of deletedAt instead of NULL in paranoidClause and restore

lib/instance.js

@@ -863,7 +863,11 @@ Instance.prototype.restore = function(options) {
       return this.Model.runHooks('beforeRestore', this, options);
     }
   }).then(function() {
-    this.setDataValue(this.Model._timestampAttributes.deletedAt, null);
+    var deletedAtCol = this.Model._timestampAttributes.deletedAt
+      , deletedAtAttribute = this.Model.rawAttributes[deletedAtCol]
+      , deletedAtDefaultValue = deletedAtAttribute.hasOwnProperty('defaultValue') ? deletedAtAttribute.defaultValue : null;
+
+    this.setDataValue(deletedAtCol, deletedAtDefaultValue);
     return this.save(_.extend({}, options, {hooks : false, omitNull : false}));
   }).tap(function() {
     // Run after hook

lib/model.js

@@ -136,9 +136,11 @@ var paranoidClause = function(model, options) {
   }
 
   var deletedAtCol = model._timestampAttributes.deletedAt
-    , deletedAtObject = {};
+    , deletedAtAttribute = model.rawAttributes[deletedAtCol]
+    , deletedAtObject = {}
+    , deletedAtDefaultValue = deletedAtAttribute.hasOwnProperty('defaultValue') ? deletedAtAttribute.defaultValue : null;
 
-  deletedAtObject[model.rawAttributes[deletedAtCol].field || deletedAtCol] = null;
+  deletedAtObject[deletedAtAttribute.field || deletedAtCol] = deletedAtDefaultValue;
 
   if (Utils._.isEmpty(options.where)) {
     options.where = deletedAtObject;
@@ -2286,8 +2288,12 @@ Model.prototype.restore = function(options) {
     }
   }).then(function() {
     // Run undelete query
-    var attrValueHash = {};
-    attrValueHash[self._timestampAttributes.deletedAt] = null;
+    var attrValueHash = {}
+      , deletedAtCol = self._timestampAttributes.deletedAt
+      , deletedAtAttribute = self.rawAttributes[deletedAtCol]
+      , deletedAtDefaultValue = deletedAtAttribute.hasOwnProperty('defaultValue') ? deletedAtAttribute.defaultValue : null;
+
+    attrValueHash[deletedAtCol] = deletedAtDefaultValue;
     options.omitNull = false;
     return self.QueryInterface.bulkUpdate(self.getTableName(options), attrValueHash, options.where, options, self._timestampAttributes.deletedAt);
   }).tap(function() {

test/integration/sequelize.test.js

@@ -1215,4 +1215,55 @@ describe(Support.getTestDialectTeaser('Sequelize'), function() {
       });
     });
   });
+
+  describe('paranoid deletedAt non-null default value', function() {
+    it('should use defaultValue of deletedAt in paranoid clause and restore', function() {
+      var epochObj = new Date(0)
+        , epoch = Number(epochObj);
+      var User = this.sequelize.define('user', {
+        username: DataTypes.STRING,
+        deletedAt: {
+          type: DataTypes.DATE,
+          defaultValue: epochObj
+        }
+      }, {
+        paranoid: true,
+      });
+
+      return this.sequelize.sync({force: true}).bind(this).then(function () {
+        return User.create({username: 'user1'}).then(function(user) {
+          expect(Number(user.deletedAt)).to.equal(epoch);
+          return User.findOne({
+            where: {
+              username: 'user1'
+            }
+          }).then(function (user) {
+            expect(user).to.exist;
+            expect(Number(user.deletedAt)).to.equal(epoch);
+            return user.destroy();
+          }).then(function(destroyedUser) {
+            expect(Number(destroyedUser.deletedAt)).not.to.equal(epoch);
+            return destroyedUser.restore();
+          }).then(function(restoredUser) {
+            expect(Number(restoredUser.deletedAt)).to.equal(epoch);
+            return User.destroy({where: {
+              username: 'user1'
+            }});
+          }).then(function() {
+            return User.count();
+          }).then(function(count) {
+            expect(count).to.equal(0);
+            return User.restore();
+          }).then(function() {
+            return User.findAll();
+          }).then(function(nonDeletedUsers) {
+            expect(nonDeletedUsers.length).to.equal(1);
+            nonDeletedUsers.forEach(function(u) {
+              expect(Number(u.deletedAt)).to.equal(epoch);
+            });
+          });
+        });
+      });
+    });
+  });
 });