Sorry, I haven't seen the action that you post in the beginning
def who_bought
@product = Product.find(params[:id] )
respond_to do |format|
format.html
format.xml { render :xml => @product.to_xml( :include => :order )
}
format.json {render :json => @product.to_json(:include => :order )
}
end
end
It should be @product.to_xml(:include => :orders)
Note the plural
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