to my knowledge, the general rule for validators is that if you have multiple requirements, you should pass a list. That being said, the are "special" validator, like IS_EMPTY_OR, that take a validator as an argument.
Goes without saying (it quite translates well), that IS_EMPTY_OR(IS_LENGTH(8)) EITHER accepts nothing or a string shorter than 8 chars. Now, the "deal". How would you consider a field in a form that is not filled ? None or '' ? IS_NOT_EMPTY() prevents an empty input. it's not clear what you want, but I guess something got cleared with my previous comments. Also, validators ONLY apply when you use them: forms, validate_and_insert(), validate_and_update(), etc. Using validators only is perfectly fine if you let the app validate each and every input. length=123 enforces the underlying column to be of that length, but if you want meaningful errors, you need to use validators anyways. On Monday, August 22, 2016 at 5:54:29 PM UTC+2, Ron Chatterjee wrote: > > In other words, if I do this: > > IS_EMPTY_OR(IS_LENGTH(8)) > > It prevents longer length string but the empty field is inserted as None. > I want to prevent both. > > > On Monday, August 22, 2016 at 10:54:08 AM UTC-4, Ron Chatterjee wrote: >> >> Two question, if you don't mind. >> >> (1) requires = IS_NOT_EMPTY(IS_LENGTH(64)) Or requires = >> IS_EMPTY_OR(IS_LENGTH(64)) Doesn't work. In other words, if I want to limit >> the string field entry but also want requires not empty, how to go about it? >> >> (2) for my sql, do I still need length = 64 (or 255 etc)? Its redundant >> when I define IS_LENGTH(64) or do I need both? >> >> >> >> >> On Monday, August 22, 2016 at 7:49:42 AM UTC-4, Niphlod wrote: >>> >>> requires=IS_LENGTH(64) will limit insertion upon validation. the >>> "length" attribute gets translated, wherever possibile, to backend-specific >>> syntaxes. >>> >>> On Sunday, August 21, 2016 at 4:21:22 AM UTC+2, billy...@gmail.com >>> wrote: >>>> >>>> How we limit string length in DAL? It seems length = 64 doesn't work. >>>> >>> -- Resources: - http://web2py.com - http://web2py.com/book (Documentation) - http://github.com/web2py/web2py (Source code) - https://code.google.com/p/web2py/issues/list (Report Issues) --- You received this message because you are subscribed to the Google Groups "web2py-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to web2py+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
