Maybe you miss fieldname:
db.workorder.children = Field.Virtual(*fieldname*, lambda row: db(db.
workorder.parent_workorder == row.id).select())
On Thursday, April 23, 2020 at 4:41:23 PM UTC+2, Jim S wrote:
>
> Given the following:
>
> from pydal import DAL
> from pydal.objects import Field, FieldMethod, FieldVirtual
> from qlf import util
> ccfg = util.Config()
>
> db = DAL(ccfg.connect_db.dal_string, migrate=False, pool_size=5)
> db.define_table('workorder',
> Field('parent_workorder', 'reference workorder'),
> Field('product'),
> Field('quantity', 'decimal(11,2)'))
>
> db.workorder.children = Field.Virtual(lambda row:
> db(db.workorder.parent_workorder
> == row.id).select())
>
> wo = db.workorder(248222)
> print(wo.children)
>
>
> ...I get this when I run the code:
>
> Traceback (most recent call last):
> File
> "/home/jim/dev/miscellaneous/projects/scratch/virtual_fields_test.py",
> line 15, in <module>
> print(wo.children)
> File "/home/jim/.local/lib/python2.7/site-packages/pydal/objects.py",
> line 167, in __getattr__
> raise AttributeError
> AttributeError
>
> What I'm trying to do is get a list of all child workorders for a specific
> workorder.
>
> I've also tried using Field.Method and calling as a function, but get an
> attribute error as well.
>
> Anyone have experience with Virtual Fields? I haven't used them in or out
> of web2py yet but am interested. Basically, I'm trying to reproduce the
> 'backref' behavior from SQLAlchemy.
>
> Thanks for any help
>
> -Jim
>
>
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