Testing a query result

[Mahmou M'hiri]

Hello every body,

It's a very basic question, i want just to test if this query did return
any result.

@BookDetails = Book.find(params[:id])


I tried "nil", but it seems that even if there isn't any book with that
id, @BookDetails is != nil.

Help please!

 

[Phrogz]

It's a very basic question, i want just to test if this query did return
any result.

@BookDetails = Book.find(params[:id])

You will probably get better results asking this question on the Ruby
on Rails discussion forum. You have instead asked it on the ruby-talk
mailing list.

 

[Mahmou M'hiri]

that's true!

 

[Stefan Mahlitz]

It's a very basic question, i want just to test if this query did return
any result.

@BookDetails = Book.find(params[:id])

You will probably get better results asking this question on the Ruby
on Rails discussion forum. You have instead asked it on the ruby-talk
mailing list.

I actually think that this is an ActiveRecord question. Does this
qualify for a redirect to rails (even if params[:id] is a good hint)?

I have to admit that I do not know whether rails does change this behaviour.

Do we cover ActiveRecord questions on ruby-talk?


To answer the original question:

ActiveRecord will raise an ActiveRecord::RecordNotFound exception which
you can detect/catch via

begin
@BookDetails = Book.find(params[:id])
rescue ActiveRecord::RecordNotFound
# the query did not return a result
end

Stefan