Ruby on rails Ruby按哈希数组排序

我有一个哈希数组，我希望能够按字母顺序对其中一个值进行排序

哈希数组：

[{"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"test"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"batch update testing"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"test"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"batch update testing"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"test"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"batch update testing"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"test"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"batch update testing"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"test"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"batch update testing"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"test"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"batch update testing"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"test"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"batch update testing"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>22, "field_string"=>"c next"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>33, "field_string"=>"d next"}]

运行“排序依据”后：

records.sort_by { |rec| rec[:field_string]}
=> [{"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"test"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"batch update testing"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"test"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"batch update testing"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"test"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"batch update testing"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"test"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"batch update testing"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"test"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"batch update testing"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"test"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"batch update testing"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"test"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"batch update testing"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>22, "field_string"=>"c next"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>33, "field_string"=>"d next"}]

它为field\u int列正确排序，但我无法理解它为什么不能正确处理field\u字符串。 如果有人有什么想法，我真的很感激听他们说

---

谢谢

哈希中的键是字符串而不是符号

记录[0][：字段\u字符串]

为

nil

记录[0][“字段字符串”]

是

的“测试”

因此，您的排序将nils与nils进行比较，并保持原始顺序

你需要：

records.sort_by { |rec| rec["field_string"]}

它输出：

=> [{"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"batch update testing"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"batch update testing"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"batch update testing"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"batch update testing"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"batch update testing"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"batch update testing"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"batch update testing"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>22, "field_string"=>"c next"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>33, "field_string"=>"d next"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"test"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"test"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"test"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"test"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"test"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"test"},
 {"hidden"=>false, "id"=>"5f898f7784743992f24fcb51", "field_int"=>11, "field_string"=>"test"}]

---

它可能会令人困惑，因为它也存在。

是的，就这样！谢谢。

records

听起来像是

ActiveRecord

实例的集合。为什么要用散列呢？