To get the actual ID field of the referenced table, you can also do: db.mytable.myfield.referent
and to get the table: db.mytable.myfield.referent.table and to get the table name: db.mytable.myfield.referent.tablename Anthony On Wednesday, February 12, 2014 5:40:00 PM UTC-5, Anthony wrote: > > A reference field has type "reference tablename", so you can do: > > db.mytable.myfield.type.split(' ')[-1] > > Anthony > > On Wednesday, February 12, 2014 3:58:58 PM UTC-5, Ian W. Scott wrote: >> >> I've been working for a while on a very flexible (and so increasingly >> complex) multiple-select widget that can be re-populated from the db via >> ajax (without submitting the form). One think I had to do was figure out >> how to get the name of the table referenced by the field using my widget. >> With some help from the folks here I found this solution: >> >> referencetable = myfield.requires[0].ktable >> >> I'm starting to realize, though, that this is fragile. I know it's doing >> an end-run around the DAL api (accessing implementation details instead of >> the stable api). I also found recently that this was broken by the >> IS_EMPTY_OR validator. For the moment I'm hacking a solution by doing this: >> >> try: >> referencetable = myfield.requires[0].ktable >> except AttributeError: >> # because IS_EMPTY_OR doesn't have a property .ktable, >> # it's on the second, wrapped validator >> referencetable = myfield.requires[0].other.ktable >> >> But I'm digging myself a deeper hole. Now I'm using a second >> implementation detail (the "other" instance variable of IS_EMPTY_OR) and my >> widget is that much more prone to being broken by future releases. >> >> So I'm wondering whether >> >> (a) there's a way to access this data via the api that I'm just missing; >> or >> (b) this is reason to add access to the referenced table to the api. >> >> This could be as simple as adding a get_reference_table() method to the >> validators that (for the time being) draws on the instance variables I've >> been using. >> >> # in IS_EMPTY_OR >> def get_reference_table(self): >> return self.other.ktable >> >> # in IS_IN_DB >> def get_reference_table(self): >> return self.ktable >> >> I'm not sure, though, whether the validator is the best place for that >> method. Should it be a method of Field instead? (That is, if others see a >> need for this at all.) >> >> Cheers, >> >> Ian >> > -- 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/groups/opt_out.