Made as_values method from TableBase an interator

django_tables2/tables.py

@@ -556,13 +556,13 @@ def as_html(self, request):
 
     def as_values(self):
         '''
-        Return a 2d array of the data which would be shown in the table where the first row is the table headers.
+        Return a row iterator of the data which would be shown in the table where the first row is the table headers.
 
         This can be used to output the table data as CSV, excel, etc
         '''
-        headings = [str(c.header) for c in self.columns]
-        rows = [[r.get_cell_value(column.name) for column in r.table.columns] for r in self.rows]
-        return [headings] + rows
+        yield [str(c.header) for c in self.columns]
+        for r in self.rows:
+            yield [r.get_cell_value(column.name) for column in r.table.columns]
 
     def has_footer(self):
         '''

tests/test_core.py

@@ -522,7 +522,7 @@ class Table(tables.Table):
     expected = [['Name', 'Country']] + [[r['name'], r['country']] for r in data]
     table = Table(data)
 
-    assert table.as_values() == expected
+    assert list(table.as_values()) == expected
 
 
 def test_as_values_empty_values():
@@ -542,7 +542,7 @@ class Table(tables.Table):
     ]
     expected = [['Name', 'Country']] + [[r.get('name'), r.get('country')] for r in data]
     table = Table(data)
-    assert table.as_values() == expected
+    assert list(table.as_values()) == expected
 
 
 def test_row_attrs():

tests/test_models.py

@@ -421,4 +421,4 @@ class Meta:
     table = PersonTable(Person.objects.all())
 
     with assertNumQueries(1):
-        table.as_values()
+        list(table.as_values())