diff --git a/lib/datasource.js b/lib/datasource.js
index dbbd162f..8ca49a3f 100644
--- a/lib/datasource.js
+++ b/lib/datasource.js
@@ -515,7 +515,11 @@ DataSource.prototype.setupDataAccess = function(modelClass, settings) {
       idProp.type = idType;
       modelClass.definition.rawProperties[idName].type = idType;
       modelClass.definition.properties[idName].type = idType;
-      if (settings.forceId) {
+      var forceId = settings.forceId;
+      if (idProp.generated && forceId !== false) {
+        forceId = true;
+      }
+      if (forceId) {
         modelClass.validatesAbsenceOf(idName, { if: 'isNewRecord' });
       }
     }
diff --git a/test/crud-with-options.test.js b/test/crud-with-options.test.js
index 235b30f2..870d8229 100644
--- a/test/crud-with-options.test.js
+++ b/test/crud-with-options.test.js
@@ -13,6 +13,7 @@ describe('crud-with-options', function() {
   before(function(done) {
     db = getSchema();
     User = db.define('User', {
+      id: { type: Number, id: true },
       seq: { type: Number, index: true },
       name: { type: String, index: true, sort: true },
       email: { type: String, index: true },
diff --git a/test/default-scope.test.js b/test/default-scope.test.js
index d35c8690..ef902e3e 100644
--- a/test/default-scope.test.js
+++ b/test/default-scope.test.js
@@ -94,6 +94,7 @@ describe('default scope', function() {
 
     Person = db.define('Person', { name: String }, {
       scope: { include: 'things' },
+      forceId: false,
     });
 
     // inst is only valid for instance methods
diff --git a/test/loopback-dl.test.js b/test/loopback-dl.test.js
index 277c760f..3897df43 100644
--- a/test/loopback-dl.test.js
+++ b/test/loopback-dl.test.js
@@ -766,7 +766,7 @@ describe('Models attached to a dataSource', function() {
       title: { type: String, length: 255, index: true },
       content: { type: String },
       comments: [String],
-    });
+    }, { forceId: false });
   });
 
   beforeEach(function(done) {
diff --git a/test/manipulation.test.js b/test/manipulation.test.js
index b7ed34e6..6b9eb4e9 100644
--- a/test/manipulation.test.js
+++ b/test/manipulation.test.js
@@ -61,6 +61,21 @@ describe('manipulation', function() {
       Person.destroyAll(done);
     });
 
+    describe('forceId', function() {
+      before(function(done) {
+        TestForceId = db.define('TestForceId');
+        db.automigrate('TestForceId', done);
+      });
+
+      it('it defaults to forceId:true for generated id property', function(done) {
+        TestForceId.create({ id: 1 }, function(err, t) {
+          should.exist(err);
+          err.message.should.match(/can\'t be set/);
+          done();
+        });
+      });
+    });
+
     it('should create instance', function(done) {
       Person.create({ name: 'Anatoliy' }, function(err, p) {
         p.name.should.equal('Anatoliy');
@@ -308,7 +323,7 @@ describe('manipulation', function() {
     it('should refuse to create object with duplicate id', function(done) {
       // NOTE(bajtos) We cannot reuse Person model here,
       // `settings.forceId` aborts the CREATE request at the validation step.
-      var Product = db.define('ProductTest', { name: String });
+      var Product = db.define('ProductTest', { name: String }, { forceId: false });
       db.automigrate('ProductTest', function(err) {
         if (err) return done(err);
 
@@ -825,7 +840,7 @@ describe('manipulation', function() {
           title: { type: String, length: 255, index: true },
           content: { type: String },
           comments: [String],
-        });
+        }, { forceId: false });
         ds.automigrate('Post', done);
       });
 
@@ -1046,6 +1061,8 @@ describe('manipulation', function() {
         ds.automigrate('Post', done);
       });
       beforeEach(function(done) {
+        // TODO(bajtos) add API to lib/observer - remove observers for all hooks
+        Post._observers = {};
         Post.destroyAll(function() {
           Post.create({ title: 'a', content: 'AAA' }, function(err, p) {
             if (err) return done(err);
diff --git a/test/relations.test.js b/test/relations.test.js
index 0ad952d6..88ca46db 100644
--- a/test/relations.test.js
+++ b/test/relations.test.js
@@ -4190,7 +4190,7 @@ describe('relations', function() {
       tmp = getTransientDataSource();
       // db = getSchema();
       Person = db.define('Person', { name: String });
-      Address = tmp.define('Address', { street: String });
+      Address = tmp.define('Address', { street: String }, { forceId: false });
       Address.validatesPresenceOf('street');
 
       db.automigrate(['Person'], done);
@@ -4488,7 +4488,7 @@ describe('relations', function() {
       // db = getSchema();
       Category = db.define('Category', { name: String });
       Job = db.define('Job', { name: String });
-      Link = db.define('Link', { name: String, notes: String });
+      Link = db.define('Link', { name: String, notes: String }, { forceId: false });
     });
 
     it('can be declared', function(done) {