Ruby on Rails

Thanks for response. I checked with logger and it is indeed an array:

logger.info "Is array? #{available_books.flatten.is_a?(Array)}"
#outputs: true

It's an array of subbook objects:
<Subbook:0x10bef7de0>#<Subbook:0x10bef7ca0>#<Subbook:
0x10bef7bb0>#<Subbook:0x10bef7ae8>#<Subbook:0x10bec0ed0>#<Subbook:
0x10bec0db8>#<Subbook:0x10bec0cc8>#<Subbook:0x10bec0840>#<Subbook:
0x10bea9140>#<Subbook:0x10bea8fd8>#<Subbook:0x10bea8e70>#<Subbook:
0x10bea8c90>#<Subbook:0x10be8a998>#<Subbook:0x10be8a678>#<Subbook:
0x10be8a268>#<Subbook:0x10be86c80>#<Subbook:0x10be780e0>#<Subbook:
0x10be78018>#<Subbook:0x10be77f28>#<Subbook:0x10be77e88>#<Subbook:
0x10be69b58>#<Subbook:0x10be69ab8>#<Subbook:0x10be699a0>#<Subbook:
0x10be698d8>#<Subbook:0x10be63d98>#<Subbook:0x10be63cf8>#<Subbook:
0x10be63b90>#<Subbook:0x10be63af0>#<Subbook:0x10be5d3d0>#<Subbook:
0x10be5cd90>#<Subbook:0x10be5c4f8>#<Subbook:0x10be5c3e0>#<Subbook:
0x10be53768>#<Subbook:0x10be53420>#<Subbook:0x10be532e0>#<Subbook:
0x10be531f0>#<Subbook:0x10be46180>#<Subbook:0x10be45e88>#<Subbook:
0x10be45ac8>#<Subbook:0x10be45960>

Now when I look at above, it appears to reference the class itself,
and since Active Record converts fields to instance methods, the class
itself doesn't have access to the sequence instance method, only
instances of the class.

Is this the problem and how would I address it?

Thanks for response

On Jun 28, 1:34 pm, Michael Pavling <pavl...@gmail.com> wrote:
> On 28 June 2011 18:10, John Merlino <stoici...@aol.com> wrote:
>
> >    available_books = books.each.map do |book|
> >      book.subbooks.where(:book_state_id =>
> > BookState[:available_for_assignment].id)
> >    end
>
> > available_books.flatten.map(&:sequence).min
>
> > "undefined method sequence for 1:Fixnum"
>
> > produces the above error. It's this part "map(&:sequence).min" that is
> > causing it. Basically I am flattening the array of subbooks and then
> > searching the one which has the lowest value for the sequence
> > attribute, corresponding to a sequence field in the subbooks table.
>
> The problem is that the "array of subbooks" isn't an array of
> subbooks, it's an array of something which includes some integers.
> Hence, when you iterate it, you get an undefined method for Integer.
>
> I would be inspecting the available_books array in debug (or the
> console) and seeing what it really consists of.
>
> BTW, I'd also suggest that the whole "get_for_assignment" method could
> be achieved by a scope with the appropriate conditions...

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