假设我的模型中有以下三个记录：
#<Rda:0xf6e8a0c
id: 1,
age_group: "18-100",
weight: "60",
nutrient: "energy(kcal/day)",
value: "2730",
created_at: Sat, 15 Oct 2016 08:21:43 UTC +00:00,
updated_at: Sat, 15 Oct 2016 08:21:43 UTC +00:00>
#<Rda:0xf6e8a0c
id: 2,
age_group: "10-15",
weight: "60",
nutrient: "energy(kcal/day)",
value: "2730",
created_at: Sat, 15 Oct 2016 08:21:43 UTC +00:00,
updated_at: Sat, 15 Oct 2016 08:21:43 UTC +00:00>
#<Rda:0xf6e8a0c
id: 3,
age_group: "20-100",
weight: "60",
nutrient: "energy(kcal/day)",
value: "2730",
created_at: Sat, 15 Oct 2016 08:21:43 UTC +00:00,
updated_at: Sat, 15 Oct 2016 08:21:43 UTC +00:00>
现在，我想获取所有给定值在“ age_group”列范围内的记录。例如：假设我的年龄是25岁，那么我应该从上述记录中获得ID为1和3的记录，因为“ 25”介于“ 18-100”和“ 20-100”之间
你可能会做
def self.foo(age)
all.select { |rda| Range.new(*rda.age_group.split('-').map(&:to_i)).cover? age }
end
本文收集自互联网，转载请注明来源。
如有侵权，请联系 [email protected] 删除。
我来说两句