diff --git a/slick_reporting/generator.py b/slick_reporting/generator.py
index 1f14027..7cd2dcc 100644
--- a/slick_reporting/generator.py
+++ b/slick_reporting/generator.py
@@ -244,7 +244,11 @@ def __init__(self, report_model=None, main_queryset=None, start_date=None, end_d
                 self.main_queryset = self._apply_queryset_options(main_queryset)
                 if type(self.group_by_field) is ForeignKey and '__' not in self.group_by:
                     ids = self.main_queryset.values_list(self.group_by_field_attname).distinct()
-                    self.main_queryset = self.group_by_field.related_model.objects.filter(pk__in=ids).values()
+                    # uses the same logic that is in Django's query.py when fields is empty in values() call
+                    concrete_fields = [f.name for f in self.group_by_field.related_model._meta.concrete_fields]
+                    # add database columns that are not already in concrete_fields
+                    final_fields = concrete_fields + list(set(self.get_database_columns()) - set(concrete_fields))
+                    self.main_queryset = self.group_by_field.related_model.objects.filter(pk__in=ids).values(*final_fields)
                 else:
                     self.main_queryset = self.main_queryset.distinct().values(self.group_by_field_attname)
         else:
@@ -478,7 +482,7 @@ def _parse(self):
         self._crosstab_parsed_columns = self.get_crosstab_parsed_columns()
 
     def get_database_columns(self):
-        return [col['name'] for col in self.parsed_columns if col['source'] == 'database']
+        return [col['name'] for col in self.parsed_columns if 'source' in col and col['source'] == 'database']
 
     # def get_method_columns(self):
     #     return [col['name'] for col in self.parsed_columns if col['type'] == 'method']
diff --git a/tests/models.py b/tests/models.py
index 218705d..471d0be 100644
--- a/tests/models.py
+++ b/tests/models.py
@@ -22,6 +22,8 @@ class Meta:
         verbose_name = _('Product')
         verbose_name_plural = _('Products')
 
+class Contact(models.Model):
+    address = models.CharField(max_length=200, verbose_name=_('Name'))
 
 class Client(models.Model):
     slug = models.CharField(max_length=200, verbose_name=_('Client Slug'))
@@ -29,6 +31,7 @@ class Client(models.Model):
     name = models.CharField(max_length=200, verbose_name=_('Name'))
     email = models.EmailField(blank=True)
     notes = models.TextField()
+    contact = models.ForeignKey(Contact, on_delete=models.CASCADE, null=True)
 
     class Meta:
         verbose_name = _('Client')
diff --git a/tests/test_generator.py b/tests/test_generator.py
index f56a882..2c8333d 100644
--- a/tests/test_generator.py
+++ b/tests/test_generator.py
@@ -13,7 +13,7 @@
     TimeSeriesCustomDates
 
 from .tests import BaseTestData, year
-from .models import SimpleSales
+from .models import SimpleSales, Client
 
 
 class MatrixTests(BaseTestData, TestCase):
@@ -208,6 +208,35 @@ def test_group_by_traverse(self):
         self.assertEqual(data[0]['product__category'], 'small')
         self.assertEqual(data[1]['product__category'], 'big')
 
+    def test_group_by_and_foreign_key_field(self):
+        report = ReportGenerator(report_model=SimpleSales, group_by='client',
+                                 columns=['name', 'contact_id', 'contact__address', SlickReportField.create(Sum, 'value'), '__total__'],
+                                 # time_series_pattern='monthly',
+                                 date_field='doc_date',
+                                 # time_series_columns=['__debit__', '__credit__', '__balance__', '__total__']
+                                 )
+
+        self.assertTrue(report._report_fields_dependencies)
+        data = report.get_report_data()
+        # import pdb;
+        # pdb.set_trace()
+        self.assertNotEqual(data, [])
+        self.assertEqual(data[0]['name'], 'Client 1')
+        self.assertEqual(data[1]['name'], 'Client 2')
+        self.assertEqual(data[2]['name'], 'Client 3')
+
+        self.assertEqual(data[0]['contact_id'], 1)
+        self.assertEqual(data[1]['contact_id'], 2)
+        self.assertEqual(data[2]['contact_id'], 3)
+
+        self.assertEqual(data[0]['sum__value'], 300)
+
+        self.assertEqual(Client.objects.get(pk=1).contact.address, 'Street 1')
+        self.assertEqual(data[0]['contact__address'], 'Street 1')
+        self.assertEqual(data[1]['contact__address'], 'Street 2')
+        self.assertEqual(data[2]['contact__address'], 'Street 3')
+
+
     def test_db_field_column_verbose_name(self):
         report = GenericGenerator()
         field_list = report.get_list_display_columns()
diff --git a/tests/tests.py b/tests/tests.py
index 6cc633c..5b53f6c 100644
--- a/tests/tests.py
+++ b/tests/tests.py
@@ -10,7 +10,7 @@
 from slick_reporting.fields import SlickReportField, BalanceReportField
 from tests.report_generators import ClientTotalBalance, ProductClientSalesMatrix2, GroupByCharField, \
     GroupByCharFieldPlusTimeSeries, TimeSeriesWithOutGroupBy
-from .models import Client, Product, SimpleSales, OrderLine, UserJoined, SalesWithFlag, ComplexSales, TaxCode
+from .models import Client, Contact, Product, SimpleSales, OrderLine, UserJoined, SalesWithFlag, ComplexSales, TaxCode
 from . import report_generators
 
 from slick_reporting.registry import field_registry
@@ -36,8 +36,14 @@ def setUpTestData(cls):
         cls.user = user
         cls.limited_user = limited_user
         cls.client1 = Client.objects.create(name='Client 1')
+        cls.client1.contact = Contact.objects.create(address='Street 1')
+        cls.client1.save()
         cls.client2 = Client.objects.create(name='Client 2')
+        cls.client2.contact = Contact.objects.create(address='Street 2')
+        cls.client2.save()
         cls.client3 = Client.objects.create(name='Client 3')
+        cls.client3.contact = Contact.objects.create(address='Street 3')
+        cls.client3.save()
         cls.clientIdle = Client.objects.create(name='Client Idle')
 
         cls.product1 = Product.objects.create(name='Product 1', category='small')