Question

我正在尝试按domains排序rank，这是metrics属性的众多键之一。

这是一个对象的例子：

Domain.all.first.attributes
        => {
                    "id" => 1,
                  "name" => "example.com",
                "status" => "active",
               "country" => "Generic",
             "languages" => [],
                   "ips" => [],
            "created_at" => Sun, 25 Dec 2016 11:03:11 UTC +00:00,
            "updated_at" => Mon, 06 Feb 2017 18:17:01 UTC +00:00,
               "metrics" => {
                "internal_code" => 14803,
                            "language" => "",
                    "rank" => 98.4011625387248
               }
         }

目前我只是按created_at订购：

  def index
    @domains = filter(@domains.order(created_at: :asc))

如何按rank订购域名？

Answer 1

如果是JSON字段，您可以按以下方式订购。

span {
  display: visible;
}

Answer 2

问题是它会排序等级，但作为ex的字符串。 0, 1, 11, 15 2, 21, 3, 40, 5

您需要将其投放到float或integer，然后才能订购

Domain.order("(metrics ->> 'rank')::float")
#=> SELECT "domains".* FROM "domains" ORDER BY (metrics ->> 'rank')::float

如果需要，您可以在降序中订购

Domain.order("(metrics ->> 'rank')::float DESC")
#=> SELECT "domains".* FROM "domains" ORDER BY (metrics ->> 'rank')::float DESC

Answer 3

尝试以下内容。

@domains = filter(@domains.order("metrics.rank"))

Rails按哈希值属性排序

3 个答案: