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
>>
>
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