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!
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!
Hi Mahmou,
Mahmou M’hiri wrote:
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.
It should be nil if there’s no record in the Books table with that id.
One
thing you might want to do, though, is use:
Book.find(params[:id].to_i) since params are always strings. Other than
that, you’ll need to provide more info.
hth,
Bill
Bill W. wrote:
Hi Mahmou,
Mahmou M’hiri wrote:
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.It should be nil if there’s no record in the Books table with that id.
One
thing you might want to do, though, is use:
Book.find(params[:id].to_i) since params are always strings. Other than
that, you’ll need to provide more info.hth,
Bill
Strings are no problem for ActiveRecord finders.
You Book.find(some_id) should raise an exception if there is no record.
And Book.find_by_id(some_id) should return nil if no record is found.
Try this:
begin
Book.find(params[:id])
rescue ActiveRecord::RecordNotFound
puts “Not Found!”
end
The rescue traps the RecordNotFound exception and lets you do something
if it happens.
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