Fix KeyError on combining exclude and sequence (fixes #205)

django_tables2/tables.py

@@ -218,8 +218,11 @@ def __new__(mcs, name, bases, attrs):
         # Reorder the columns based on explicit sequence
         if opts.sequence:
             opts.sequence.expand(base_columns.keys())
-            # Table's sequence defaults to sequence declared in Meta
-            base_columns = OrderedDict(((x, base_columns[x]) for x in opts.sequence))
+            # Table's sequence defaults to sequence declared in Meta, if the
+            # column is not excluded
+            base_columns = OrderedDict((
+                (x, base_columns[x]) for x in opts.sequence if x in base_columns
+            ))
 
         # Set localize on columns
         for col_name in base_columns.keys():

tests/test_core.py

@@ -392,6 +392,7 @@ class ExcludeTable(UnorderedTable):
 
         class Meta:
             exclude = ('beta', )
+
     table = ExcludeTable([])
     assert [c.name for c in table.columns] == ['i', 'alpha', 'added']
 
@@ -408,10 +409,17 @@ class SimpleTable(tables.Table):
 
 
 def test_exclude_should_work_on_sequence_too():
+    '''
+    It should be possible to define a sequence on a table and excluded
+    and exclude it in a child of that table.
+    '''
     class PersonTable(tables.Table):
+        first_name = tables.Column()
+        last_name = tables.Column()
+        occupation = tables.Column()
+
         class Meta:
             model = Person
-            fields = ()
             sequence = ('first_name', 'last_name', 'occupation')
 
     class AnotherPersonTable(PersonTable):