Rails - Nov 2009 - aggregation: use composed_of with multiple classes (tables)

Does anyone know how to use composed_of to pull data from multiple
classes (tables)? I know how to use composed_of to aggregate columns
within the same table but am running in to trouble pulling from two
tables.

The example below works but I don''t want to see standard.strand_id, I
want to see strand.name (which is in the Strand table, not the
Standard table).

class Standard < ActiveRecord::Base
  composed_of :full_standard,
              :mapping =>
                [
                  %w[grade   grade],
                  %w[strand_id strand_id]
                  %w[number number]
                ]

class FullStandard < ActiveRecord::Base
  attr_reader :grade, :strand_id, :number

  def initialize(grade, strand, number)
    @grade = grade
    @strand_id = strand_id
    @number = number
  end

  def to_s
    [ @grade, @strand_id, @number ].compact.join(" ")
  end
end

Again, this works, BUT I don''t want to see the strand_id, I want to
see strand.name (a column in the Strand table--not the Standard table)

Also, here are the table relationships:

class Standard
belongs_to :strand

class Strand
has_many :standards

Thank you!!!

Is anyone able to share some insight regarding composed_of pulling
from two tables?

On Nov 9, 6:39 am, Demetrius
<demetri...-PkbjNfxxIARBDgjK7y7TUQ@public.gmane.org>
wrote:
> Does anyone know how to usecomposed_ofto pull data from multiple
> classes (tables)? I know how to usecomposed_ofto aggregate columns
> within the same table but am running in to trouble pulling from two
> tables.
>
> The example below works but I don''t want to see
standard.strand_id, I
> want to see strand.name (which is in the Strand table, not the
> Standard table).
>
> class Standard < ActiveRecord::Base
>  composed_of:full_standard,
>               :mapping =>
>                 [
>                   %w[grade   grade],
>                   %w[strand_id strand_id]
>                   %w[number number]
>                 ]
>
> class FullStandard < ActiveRecord::Base
>   attr_reader :grade, :strand_id, :number
>
>   def initialize(grade, strand, number)
>     @grade = grade
>     @strand_id = strand_id
>     @number = number
>   end
>
>   def to_s
>     [ @grade, @strand_id, @number ].compact.join(" ")
>   end
> end
>
> Again, this works, BUT I don''t want to see the strand_id, I want
to
> see strand.name (a column in the Strand table--not the Standard table)
>
> Also, here are the table relationships:
>
> class Standard
> belongs_to :strand
>
> class Strand
> has_many :standards
>
> Thank you!!!