On 4 September 2012 18:58, Sachin S. <[email protected]> wrote:
> Class Model_1 < ActiveRecord::Base
> ...
> has_and_belongs_to_many :model_2
>
> def some_method
>     attr_1 * Model_2.find(model_2_id).attr_I_need
> end

If the relationship is HABTM, you won't have a model_2_id attribute to
find by, there should be a join table.

If you explain in a little more detail what problem you're trying to
solve with your relationship and the mathematical operation between
them, maybe a solution can be suggested.

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