Hello,
Under Ruby On Rails, I would like to replace
mouvement = Mouvement.find(params[:id])
mouvement.statut = :traite
mouvement.save!
By
Mouvement.update(params[:id], statut ='#{:traite}'")
But this error occurs : undefined method `stringify_keys!' for "statut = traite":String
I don't understand the meaning of the error. Why does Ruby doesn't knows how to convert the symbol :traite to a string representation ?
Even statut ='#{:traite.to_s}'" don't work
Any help ?
Thank you
Under Ruby On Rails, I would like to replace
This question is probably better asked at the RoR mailing list:
http://lists.rubyonrails.org/mailman/listinfo/rails
Zouplaz wrote:
Mouvement.update(params[:id], statut ='#{:traite}'")
This isn't valid, did you mean? (note, the ")
Mouvement.update(params[:id], "statut ='#{:traite}'")
The problem is not that Ruby can't stringify :traite, instead the
problem is that you've not read the RoR docs on update() well enough.
Please see:
http://api.rubyonrails.com/classes/ActiveRecord/Base.html#M000864
If you've read this, you'd change your code to look like this:
Mouvement.update(params[:id], { :statut => 'traite' })
Or, better yet
Mouvement.find(params[:id]).update_attribute(:statut, 'traite')
Note, Rails will take the symbol and use to_yaml instead of to_s when
it saves the record, so you should explictly change it to a string
yourself before passing it in the update hash.
Zouplaz wrote:
Hello,
Under Ruby On Rails, I would like to replace
mouvement = Mouvement.find(params[:id])
mouvement.statut = :traite
mouvement.save!By
Mouvement.update(params[:id], statut ='#{:traite}'")
But this error occurs : undefined method `stringify_keys!' for "statut = traite":String
I don't understand the meaning of the error. Why does Ruby doesn't knows how to convert the symbol :traite to a string representation ?
Even statut ='#{:traite.to_s}'" don't work
Any help ?
Thank you
I can't tell you exactly, but I can give you a hint. It is converting :traite to a string. But, you have a mistype somewhere, because you have an uneven number of double quotes. I'm guessing that when you pasted/wrote the code in your email, this was obscured.
Mouvement.update(params[:id], statut ='#{:traite}'")
^ ^^
You even have it again:
Even statut ='#{:traite.to_s}'" don't work
^ ^^
Hope that helps.
-Justin
Zouplaz wrote:
Hello,
Under Ruby On Rails, I would like to replace
mouvement = Mouvement.find(params[:id])
mouvement.statut = :traite
mouvement.save!
I like this variant better. The whole point of ActiveRecord is that you
handle the database tables like objects, and the use of
#update_attribute makes the code read more like SQL generator calls
instead of ORM use. YMMV.
David Vallner
The problem is not that Ruby can't stringify :traite, instead the
problem is that you've not read the RoR docs on update() well enough.
You're right ! I read it the wrong way 
If you've read this, you'd change your code to look like this:
Mouvement.update(params[:id], { :statut => 'traite' })Or, better yet
Mouvement.find(params[:id]).update_attribute(:statut, 'traite')
Why is the second solution the better one ?
Thank you !
le 06/10/2006 11:40, eden nous a dit:
ActiveRecord is an ORM that doesn't feel like an ORM. The fact that
things like #update_attribute and #find_by_sql exist are part of the
reason that I like ActiveRecord. It's a light wrapper around my
database that lets me get down and dirty with SQL if need to (which
happens quite a bit).
Maybe I'm too pragmatic, but I definitely prefer writing one line of
code to writing 3.
David Vallner wrote:
> mouvement = Mouvement.find(params[:id])
> mouvement.statut = :traite
> mouvement.save!I like this variant better. The whole point of ActiveRecord is that you
handle the database tables like objects, and the use of
#update_attribute makes the code read more like SQL generator calls
instead of ORM use. YMMV.
Why is the second solution the better one ?
I guess it's personal preference. There's not really any huge
difference between the two methods. It all depends on what the context
is -- update() returns the object, and update_attribute() returns
true/false depending on whether the update succeeded or not (minus
validation checks).