What is the correct way to make SQLalchemy store strings as lowercase?
I haven't tried this personally, but perhaps you could use a custom comparator operator? I.e.
class CaseInsensitiveColumnComparator(ColumnProperty.Comparator): def __eq__(self, other): return func.lower(self.__clause_element__()) == func.lower(other)This way, your ID can be stored in any case, but will compare as lowercase.
Another idea - augment sqlalchemy.types.Text, and use that for your ID.
import sqlalchemy.types as typesclass LowerCaseText(types.TypeDecorator): '''Converts strings to lower case on the way in.''' impl = types.Text def process_bind_param(self, value, dialect): return value.lower()class User(Base): __tablename__ = 'user' id = Column(LowerCaseText, primary_key=True) ...