轨查询虚拟列不退出

Question

我已经写在轨道4,5

result = User.select("id, (3959 * acos(cos(radians("+latitude+")) * cos(radians(latitude)) * cos(radians(longitude) - radians("+longitude+")) + sin(radians(" +latitude +")) * sin(radians(latitude)))) as distants") 

这个查询时我检查的数据，但它告诉我distants虚拟领域？我如何显示它？

Answer 1

它实际上存在于ActiveRecord对象中。您可以通过访问它作为对象的关键得到它：

result = User.select("id, (3959 * acos(cos(radians("+latitude+")) * cos(radians(latitude)) * cos(radians(longitude) - radians("+longitude+")) + sin(radians(" +latitude +")) * sin(radians(latitude)))) as distants")

result.each do |user| 
    puts user['distants'] 
end