Order products by association count

Question

Class Product

has_many :sales

end

Class Sale

belongs_to :product

end

How do i get the most sold products.. (Product find all.. order by

Answer 1

When retrieving the Products, you could do:

 @products = Product.find(:all, :include => :sales, :order => "sales.value DESC")

'sales.value' can be replaced with whatever value you are trying to order by...

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EDIT: Disregard the rest of my answer. it won't return the Product objects in descending order by sale value, it'll return the Sales objects associated with the Product in descending order by sale value. :P

Also, you can specify the ordering in your model like:

    Class Product
        has_many :sales, :order => 'sale_value DESC'
    end

where the 'sale_value' is whatever you're trying to order by... and doing it this way, to retrieve the Products, you can just do:

 @products = Product.all