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#This file is part of Tryton. The COPYRIGHT file at the top level of
#this repository contains the full copyright notices and license terms.
from .field import Field, SQLType
class Boolean(Field):
'''
Define a boolean field (``True`` or ``False``).
'''
_type = 'boolean'
def __init__(self, string='', help='', readonly=False, domain=None,
states=None, select=False, on_change=None, on_change_with=None,
depends=None, context=None, loading='eager'):
super(Boolean, self).__init__(string=string, help=help, required=False,
readonly=readonly, domain=domain, states=states, select=select,
on_change=on_change, on_change_with=on_change_with,
depends=depends, context=context, loading=loading)
__init__.__doc__ = Field.__init__.__doc__
def sql_type(self):
return SQLType('BOOL', 'BOOL')
def _domain_add_null(self, column, operator, value, expression):
expression = super(Boolean, self)._domain_add_null(
column, operator, value, expression)
if operator in ('=', '!='):
conv = {
False: None,
None: False,
}
if value is False or value is None:
if operator == '=':
expression |= (column == conv[value])
else:
expression &= (column != conv[value])
return expression
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