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import sqlalchemy as sa
from sqlalchemy.dialects.postgresql import BIT
class BitType(sa.types.TypeDecorator):
"""
BitType offers way of saving BITs into database.
"""
impl = sa.types.BINARY
cache_ok = True
def __init__(self, length=1, **kwargs):
self.length = length
sa.types.TypeDecorator.__init__(self, **kwargs)
def load_dialect_impl(self, dialect):
# Use the native BIT type for drivers that has it.
if dialect.name == 'postgresql':
return dialect.type_descriptor(BIT(self.length))
elif dialect.name == 'sqlite':
return dialect.type_descriptor(sa.String(self.length))
else:
return dialect.type_descriptor(type(self.impl)(self.length))
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