Yes, I did use:
params[:photo][:project_id]
it is right here in my original msg below, but got separated during
posting, so that is not the problem. Also, the other method is valid,
I believe.
Thanks anyway.
jet
On Sep 17, 12:30 pm, kevinpfromnm <[email protected]> wrote:
> > �...@photo = Photo.find_by_project_id(params[:photo => :project_id])
> > (also have tried (params[:photo]
> > [:project_id]
>
> I'd be surprised if this didn't give an exception as the params is
> using hash notation for the key. If project_is is unique on your
> photo, then you want something like params[:photo][:project_id]
> assuming your params data structure is something like this:
>
> { :photo => { :project_id => #, ... }, ... }
>
> Do a raise params.inspect at the beginning of your controller method
> if you're not sure how it is structured. Looking further down, that
> is indeed how your params is handled.
>
> You might want to take a look at some ruby tutorials and practice with
> that or if it's just the hashes throwing you off, take a closer look
> at them.
>
>
>
> > in PhotosController statement always evalutates to nil,
>
> > if @photo != nil
> > @photo.update_attributes(params[:photo])
>
> > even though the project_id is in the params hash:
> > (output from my application log:)
>
> > Parameters: {"photo"=>{"project_id"=>"371", "user_id"=>"14",
> > "lwrimg"=>#<File:/tmp/RackMultipart.26504.0>}, "page_path"=>"projects/
> > edit", "authenticity_token"=>"iiwoOHgAaBTCv/U4xhmvlR2qleLbG
> > +Ov70cubJ7G8jQ=", "after_submit"=>"stay-here"}
>
> > ...so the project_id is set.
>
> > However, the SQL query is:
>
> > [4;35;1mPhoto Load (0.2ms)[0m [0mSELECT * FROM `photos` WHERE
> > (`photos`.`project_id` IS NULL) LIMIT 1[0m
>
> > ...which seems to indicate that (params[:photo => :project_id]) is
> > returning NULL,
> > or that I am misunderstanding
>
> > @photo = Photo.find_by_project_id(params[:photo => :project_id])
>
> > I thought the above would be that @photo is a copy of the record found
> > in the d.b., and
> > thus I would be able to use the test:
>
> > if @photo != nil
>
> > So, what is the correct way to update a record if it exists?
>
> > Cheers,
> > Jet
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