[Rails] Field update, best practice

Hi everybody.. I'm stuck with a strange (stupid) problem I can't
understand.

I'm trying to do this in the articles_controller:

def updatecollection
@arts = Article.find_by_solr("14 MAY 91").results

@arts.each do |doc|
@sub = doc.title[15,150]
# Updating one record:
doc.title = @sub
doc.save

end
end

It loads but i doesn't update the article..the strange fact is that if
I do the same process for a single doc in the console it works.. so
what's wrong? something in the .each do?
thanks!

(any different solution it's fine for me ;) )

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