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，我想获取我的给定值落在“age_group”列范围内的所有记录。例如:假设我的年龄是 25 岁，那么我应该从上述记录中获取 ID 为 1 和 3 的记录，因为“25”介于“18-100”和“20-100”之间
最佳答案
你可能会做
def self.foo(age)
all.select { |rda| Range.new(*rda.age_group.split('-').map(&:to_i)).cover? age }
end
关于mysql - 从给定编号所属的表中选择所有记录，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/40058080/