When I used the second choice, I got the following Traceback:
Traceback

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Traceback (most recent call last):
  File "/Users/SR/Documents/web2py/gluon/restricted.py", line 227, in restricted
    exec ccode in environment
  File "/Users/SR/Documents/web2py/applications/myapp/controllers/events.py" 
<http://127.0.0.1:8000/admin/default/edit/ncmi/controllers/events.py>, line 
417, in <module>
  File "/Users/SR/Documents/web2py/gluon/globals.py", line 417, in <lambda>
    self._caller = lambda f: f()
  File "/Users/SR/Documents/web2py/gluon/tools.py", line 4241, in f
    return action(*a, **b)
  File "/Users/SR/Documents/web2py/applications/myapp/controllers/events.py" 
<http://127.0.0.1:8000/admin/default/edit/ncmi/controllers/events.py>, line 
220, in register_workshop
    fields =['title','help2'])
  File "/Users/SR/Documents/web2py/gluon/sqlhtml.py", line 1288, in __init__
    inp = self.widgets.boolean.widget(field, default)
  File "/Users/SR/Documents/web2py/gluon/sqlhtml.py", line 278, in widget
    **attributes)
  File "/Users/SR/Documents/web2py/gluon/sqlhtml.py", line 160, in _attributes
    trigger, cond = show_if(field.show_if)
  File "/Users/SR/Documents/web2py/gluon/sqlhtml.py", line 112, in show_if
    base = "%s_%s" % (cond.first.tablename, cond.first.name)
AttributeError: 'Query' object has no attribute 'tablename'


On Sunday, July 24, 2016 at 5:32:43 PM UTC-5, Sneka R wrote:
>
> Can I use show_if for 2 tables?
> For example:
> db.table2.field.show_if = (db.table1.box==True)
>
> To be more clear:
> Model:
> db.define_table(’table1’,
>                          Field('title’,label=‘Workshop title 
> :',requires=IS_NOT_EMPTY()),
>                          Field(’help1’,’boolean’,label=’Need help?’))
>
>
> db.define_table(’table2',
>                 Field(’title', 'reference table1',label='Workshop title 
> :'),
>                 Field(‘help2’,’boolean’, label=’Need help?'))
>
> Controller:
> def register_workshop(): 
>     workshop = db.table1(request.args(0))
>     db.table2.help2.show_if = (db.table1.help1==True)
>

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