不能过滤散列数组，因为键没有属性

Question

我有这个哈希

question["options"]
=> [{"id"=>10217, "title"=>{"English"=>"Da A a E"}, "value"=>"Da A a E", "properties"=>{"disabled"=>false}},
 {"id"=>10218, "title"=>{"English"=>"Profondo"}, "value"=>"Profondo", "properties"=>{"disabled"=>true, "piping_exclude"=>"false", "show_rules"=>nil, "show_rules_logic_map"=>nil}},
 {"id"=>10219, "title"=>{"English"=>"La macchina da caffè a capsule"}, "value"=>"La macchina da caffè a capsule", "properties"=>{"disabled"=>true, "piping_exclude"=>"false", "show_rules"=>nil, "show_rules_logic_map"=>nil}},
 {"id"=>10234, "title"=>{"English"=>"Extender Wifi"}, "value"=>"Extender Wifi", "properties"=>{"disabled"=>true, "piping_exclude"=>"false", "show_rules"=>nil, "show_rules_logic_map"=>nil}},
 {"id"=>10246, "title"=>{"English"=>"Da A a F"}, "value"=>"Da A a F", "properties"=>{"disabled"=>false}},
 {"id"=>10247, "title"=>{"English"=>"Sistematico"}, "value"=>"Sistematico", "properties"=>{"disabled"=>true, "piping_exclude"=>"false", "show_rules"=>nil, "show_rules_logic_map"=>nil}},
 {"id"=>10250, "title"=>{"English"=>"4"}, "value"=>"4", "properties"=>{"disabled"=>true, "piping_exclude"=>"false", "show_rules"=>nil, "show_rules_logic_map"=>nil}},
 {"id"=>10252, "title"=>{"English"=>"Ruote"}, "value"=>"Ruote", "properties"=>{"disabled"=>true, "piping_exclude"=>"false", "show_rules"=>nil, "show_rules_logic_map"=>nil}},
 {"id"=>10268, "title"=>{"English"=>"Sub 8 GHz"}, "value"=>"Sub 8 GHz", "properties"=>{"disabled"=>true, "piping_exclude"=>"false", "show_rules"=>nil, "show_rules_logic_map"=>nil}},
 {"id"=>10273, "title"=>{"English"=>"La copertura sul territorio"}, "value"=>"La copertura sul territorio", "properties"=>{"disabled"=>true, "piping_exclude"=>"false", "show_rules"=>nil, "show_rules_logic_map"=>nil}},
 {"id"=>10280, "title"=>{"English"=>"Da A a G"}, "value"=>"Da A a G", "properties"=>nil}]

我需要过滤这个数组，删除["property"]["disabled"] is true中的每个值

我在用这个

      question["options"].filter{ |o|
        unless o["properties"].dig("disabled")
          {
           "value": o["value"],
           "id": o["id"],
           "text": {
            "it": o["title"]["English"]
           }
          }
        end
      }

但是关于最后一个值“属性”=>nil，当然还有

undefined method `dig' for nil:NilClass

我也尝试用try方法，但不起作用.

Answer 1

如果只需要删除["properties"]["disabled"]为true的元素，则只需使用具有以下条件的Array#reject

question["options"].reject { |o| o.dig("properties", "disabled") }

# => [{"id"=>10217, "title"=>{"English"=>"Da A a E"}, "value"=>"Da A a E", "properties"=>{"disabled"=>false}},
#     {"id"=>10246, "title"=>{"English"=>"Da A a F"}, "value"=>"Da A a F", "properties"=>{"disabled"=>false}},                                           
#     {"id"=>10280, "title"=>{"English"=>"Da A a G"}, "value"=>"Da A a G", "properties"=>nil}]

但是，正如我在问题中所看到的，您也尝试映射过滤过的数据(带有符号键)，在本例中，您可以使用Enumerable#filter_map。

question["options"].filter_map do |o|
  unless o.dig("properties", "disabled")
    {
      value: o["value"],
      id: o["id"],
      text: { it: o["title"]["English"] }
    }
  end
end

# => [{:value=>"Da A a E", :id=>10217, :text=>{:it=>"Da A a E"}},
#     {:value=>"Da A a F", :id=>10246, :text=>{:it=>"Da A a F"}}, 
#     {:value=>"Da A a G", :id=>10280, :text=>{:it=>"Da A a G"}}]