sync_schema_props_perms('defaultval')

def convert_defaultval(cwattr, default):

    from decimal import Decimal

    import yams

    from cubicweb import Binary

    if default is None:

        return

    atype = cwattr.to_entity[0].name

    if atype == 'Boolean':

        assert default in ('True', 'False'), default

        default = default == 'True'

    elif atype in ('Int', 'BigInt'):

        default = int(default)

    elif atype == 'Float':

        default = float(default)

    elif atype == 'Decimal':

        default = Decimal(default)

    elif atype in ('Date', 'Datetime', 'TZDatetime', 'Time'):

        try:

            # handle NOW and TODAY, keep them stored as strings

            yams.KEYWORD_MAP[atype][default.upper()]

            default = default.upper()

        except KeyError:

            # otherwise get an actual date or datetime

            default = yams.DATE_FACTORY_MAP[atype](default)

    else:

        assert atype == 'String', atype

        default = unicode(default)

    return Binary.zpickle(default)

dbh = repo.system_source.dbhelper

driver = config.sources()['system']['db-driver']

if driver == 'postgres' or driver.startswith('sqlserver'):

    sql('ALTER TABLE cw_cwattribute ADD new_defaultval %s' % dbh.TYPE_MAPPING['Bytes'])

else:

    assert False, 'upgrade not supported on this database backend'

for cwattr in rql('CWAttribute X').entities():

    olddefault = cwattr.defaultval

    if olddefault is not None:

        req = "UPDATE cw_cwattribute SET new_defaultval = %(val)s WHERE cw_eid = %(eid)s"

        args = {'val': dbh.binary_value(convert_defaultval(cwattr, olddefault).getvalue()), 'eid': cwattr.eid}

        sql(req, args, ask_confirm=False)

sql('ALTER TABLE cw_cwattribute DROP COLUMN cw_defaultval')

if config.sources()['system']['db-driver'] == 'postgres':

    sql('ALTER TABLE cw_cwattribute RENAME COLUMN new_defaultval TO cw_defaultval')

else:

    sql("sp_rename 'cw_cwattribute.new_defaultval', 'cw_defaultval', 'COLUMN'")

# Set object type to "Bytes" for CWAttribute's "defaultval" attribute

rql('SET X to_entity B WHERE X is CWAttribute, X from_entity Y, Y name "CWAttribute", '

    'X relation_type Z, Z name "defaultval", B name "Bytes"')

from yams import buildobjs as ybo

schema.add_relation_def(ybo.RelationDefinition('CWAttribute', 'defaultval', 'Bytes'))

schema.del_relation_def('CWAttribute', 'defaultval', 'String')

commit()