The IS_IN_DB validator takes an _and argument to get around this problem,
but there is no _and argument for IS_IN_SET(). Instead, you can explicitly
set the widget for the field:
Field('f_file_format,
requires=[IS_IN_SET(list_of_acceptable_options), CUSTOM_VALIDATOR(...)],
widget=SQLFORM.widgets.options.widget)
As long as the IS_IN_SET validator is the first one in the list, the widget
will build its options using the IS_IN_SET options.
For more on widgets, see
http://web2py.com/books/default/chapter/29/07#Widgets.
Anthony
On Tuesday, January 29, 2013 1:36:24 PM UTC-5, Lamps902 wrote:
>
> Thanks, Anthony. I was under the impression that list:string is the
> convention if you want the field to render as a selector with SQLFORM().
> You're right that it's possible to change the field from list:string to
> string and use IS_IN_SET() to maintain the field as a select element.
> However, I still cannot apply a list of validators after doing this. Having
> changed the field from list:string to string, when I apply the validators
> as such: Field(... requires=[IS_IN_SET(...)] ...), SQLFORM now renders the
> field as an input field rather than a drop-down menu/select element.
>
> On Tuesday, January 29, 2013 9:39:09 AM UTC-5, Anthony wrote:
>>
>> If you don't want to allow the user to select multiple options, then why
>> is the field type list:string rather than just string? If you make it just
>> a string type, then you will be able to apply a list of validators, as
>> below.
>>
>> Anthony
>>
>> On Tuesday, January 29, 2013 5:39:59 AM UTC-5, Lamps902 wrote:
>>>
>>> Thank you for the replies, guys! I think my abstract/trivial example may
>>> have obfuscated things a bit. I'm trying to use the IS_IN_SET() validator
>>> in combination with a custom validator (yet to be fully written) to make it
>>> so that all the elements of a dropdown menu/select are taken from a given
>>> set of options (a list of file formats), and for the selected option (file
>>> format), the custom validator will make sure the file is in that format.
>>> Something like this might be a better description than the initial post:
>>>
>>> Field('f_file_format, type='list:string',
>>>
>>> requires=[IS_IN_SET(theset=list_of_acceptable_options,zero=T('make a
>>> selection'), error_message=T(some_error_message)),
>>> CUSTOM_VALIDATOR(request.vars.f_file_format,
>>> request.vars.file, error_message=T(some_error_message2))]
>>>>
>>>> )
>>>
>>> To clarify - I'm not seeking to let the user be able to select multiple
>>> options from the drop down list. Maybe it's better to implement the custom
>>> validator functionality I'm looking for in the controller, or can it be
>>> done in the model? Thank you.
>>>
>>
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