From: Tahura Chaudhry <tahura@...>
Date: 2008-06-14T06:36:10+09:00
Subject: Re: validate a select (boolean)

Tahura Chaudhry wrote:
> I am using
> Ruby Version: 1.8.4
> Rails Version: 1.2.2
> 
> I have an issue regarding validation of a boolean field in my
> applicaiton.
> 
> On the UI, I had to show a dropdown with options: "yes", "no" and ""
> (blank)
> 
> My HTML view contains:
> 
> <%= select 'guest', 'attending', [['Yes', true], ['No', false]],
> {:include_blank => true, :custom_label => 'Will you be attending?'}  %>
> 
> The view is rendered correctly.
> 
> 
> The validation for this dropdown requires that blank is invalid.  Only
> "yes" or "no" are valid.
> 
> My Model (guest.rb) contains:
> 
> validates_inclusion_of (:attending, :in => [true, false])
> 
> The Issue is:
> 
> When I select blank in the UI dropdown component and post the form, the
> validation succeeds and when the form is redisplayed 'No' is selected in
> the dropdown.  I see that in the database (MySQL) attending column,
> false gets saved in that column.
> 
> How do I make validation to fail when blank is selected in the dropdown.
> 
> thanks,


I'm beginning to think it has to do with with the Model field's (i.e 
'attending' in guest.rb) mapping to the MySQL column ("attending") which 
is declared in the schema as:

  (`attending` tinyint(1) unsigned default NULL)



I have tried debugging the code but can't seem to find the source of 
this problem.  Any ideas?

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