import logging
from sqlalchemy.types import TypeDecorator, Text
from sqlalchemy.dialects.mysql import TEXT as MySQLText, LONGTEXT
logger = logging.getLogger(__name__)
class UTF8LongText(TypeDecorator):
""" Platform-independent UTF-8 LONGTEXT type.
Uses MySQL's LongText with charset utf8mb4, otherwise uses TEXT, because
other engines default to UTF-8 and have longer TEXT fields.
"""
impl = Text
def load_dialect_impl(self, dialect):
if dialect.name == 'mysql':
return dialect.type_descriptor(LONGTEXT(charset='utf8mb4', collation='utf8mb4_unicode_ci'))
else:
return dialect.type_descriptor(Text())
