Rails - Dec 2009 - What's the "update" equivalent to the "build" method?

Currently I''m using .build in my Create action so that I have a little
more control before it gets saved.  For instance, I have:
    @comment = current_user.comments.build(params[:comment])
      @comment.blog_comment = @comment.blog_comment[0...140]

to chop the blog_comment off at 140 characters.  Well, that works
great, but if a user goes to edit that comment, they can then make the
comment longer than 140 characters since I''m using the following in
the update action:

    @comment = Comment.find(params[:id])
    if @comment.update_attributes(params[:comment])

So, how do I interject and chop off the comment at 140 characters when
a user decides to update their comment?

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On Sat, Dec 19, 2009 at 3:20 PM, AlwaysCharging
<goodgets-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Currently I''m using .build in my Create action so that I have a
little
> more control before it gets saved.  For instance, I have:
>    @comment = current_user.comments.build(params[:comment])
>      -I4CJOCdi0N4RIhToyOJVgQ@public.gmane.org_comment =
@comment.blog_comment[0...140]
>
> to chop the blog_comment off at 140 characters.  Well, that works
> great, but if a user goes to edit that comment, they can then make the
> comment longer than 140 characters since I''m using the following
in
> the update action:
>
>    @comment = Comment.find(params[:id])
>    if @comment.update_attributes(params[:comment])
>
> So, how do I interject and chop off the comment at 140 characters when
> a user decides to update their comment?
One way might be to alter the value first with something like:

   @comment = Comment.find(params[:id]
   comment_attributes = params[:comment]
   comment_attributes[''blog_comment'']
&&comment_attributes[''blog_comment''][0...140]
   if @comment.update_attributes(comment_attributes)


Something similar could also be done in the create case, in which case
I''d factor out the two lines calculating comment_attributes into a
controller method.

-- 
Rick DeNatale

Blog: http://talklikeaduck.denhaven2.com/
Twitter: http://twitter.com/RickDeNatale
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Seems like the perfect place for a call back if you''re doing this
without discriminating.

class Comment < ActiveRecord::Base
  ...
  before_validation :trim_blog_comment

  protected
  def block_comment
    self.blog_comment = blog_comment[0..140] if blog_comment.length >
140
  end
end


Now it''s being trimmed at the model level on all creates/saves/
updates, no matter where the call to save comes from.
On Dec 19, 3:20 pm, AlwaysCharging
<goodg...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Currently I''m using .build in my Create action so that I have a
little
> more control before it gets saved.  For instance, I have:
>     @comment = current_user.comments.build(params[:comment])
>       @comment.blog_comment = @comment.blog_comment[0...140]
>
> to chop the blog_comment off at 140 characters.  Well, that works
> great, but if a user goes to edit that comment, they can then make the
> comment longer than 140 characters since I''m using the following
in
> the update action:
>
>     @comment = Comment.find(params[:id])
>     if @comment.update_attributes(params[:comment])
>
> So, how do I interject and chop off the comment at 140 characters when
> a user decides to update their comment?
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This is perfect!  Thank you Emery.
I was thinking the same thing, but was trying before_save filters and
couldn''t get it to work for the Update action.
Honestly, I didn''t even know about the before_validation helper, guess
I got some more learnin'' to do.
Thanks again.

And @Rick, thank you for the suggestion as well.

On Dec 19, 3:58 pm, Emery Finkelstein
<emery.finkelst...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Seems like the perfect place for a call back if you''re doing this
> without discriminating.
>
> class Comment < ActiveRecord::Base
>   ...
>   before_validation :trim_blog_comment
>
>   protected
>   def block_comment
>     self.blog_comment = blog_comment[0..140] if blog_comment.length >
> 140
>   end
> end
>
> Now it''s being trimmed at the model level on all creates/saves/
> updates, no matter where the call to save comes from.
> On Dec 19, 3:20 pm, AlwaysCharging
<goodg...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
>
> > Currently I''m using .build in my Create action so that I have
a little
> > more control before it gets saved.  For instance, I have:
> >     @comment = current_user.comments.build(params[:comment])
> >       @comment.blog_comment = @comment.blog_comment[0...140]
>
> > to chop the blog_comment off at 140 characters.  Well, that works
> > great, but if a user goes to edit that comment, they can then make the
> > comment longer than 140 characters since I''m using the
following in
> > the update action:
>
> >     @comment = Comment.find(params[:id])
> >     if @comment.update_attributes(params[:comment])
>
> > So, how do I interject and chop off the comment at 140 characters when
> > a user decides to update their comment?
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