On Saturday, 2 August 2014 11:41:46 UTC-4, Ruby-Forum.com User wrote:
>
> Eric Saupe wrote in post #1154001:
> > First change the validates to only validate if a
> > password is being passed.
> >
> > validates :password, length: { minimum: 6 }, :if => :password
> >
> >
> > Second, remove the parameters for password if the are blank on your
> > update
> > method.
> >
> > if params[:password].blank?
> > params.delete(:password)
> > end
> >
>
> The latter I only did, because in this case it would obviously not work,
> but I was not aware of the trick for the validates function!
>
> I think I'll have to do this for all 'validates' in my application,
> because I often have the case that I will update only some of the
> attributes. I wonder *why* validates looks at attributes which are not
> part of the update. Is there a use case where this makes sense?
>
>
This is usually the desired behavior, because you want to ensure that the
*whole* record is valid before saving.
:password is a outlier here, since it isn't persisted to the database. In
your case, I might add something like:
validates :password, length: { minimum: 6 }, on: :create
Since (unless users can change their passwords) you only need to check it
when creating a new record.
--Matt Jones
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