def table_override(original, base, overrides={}):
result = Table(original.name, base.metadata, schema=original.schema)
for col in original.columns:
if col.name not in overrides:
result.append_column(col.copy())
else:
new_col = overrides[col.name].copy()
new_col.name = col.name
result.append_column(new_col)
return result
def view(name, schema, metadata, selectable):
"""
Create a view for the given select. A table is returned which can be
used to query the view.
"""
# a temporary MetaData object is used to avoid that this table is actually
# created
t = Table(name, MetaData(), schema=schema)
for c in selectable.c:
t.append_column(Column(c.name, c.type, primary_key=c.primary_key))
return t
