过滤具有复杂嵌套结构的地图 [英] Filter a map with complex nested structure

问题描述

对复杂嵌套结构的嵌套字段强加一个条件的最佳方法是...

What would be a best way to impose a condition on the nested fields of complex nested structure like...

{
    :aa {:a "a_val",:b "b_val"},
    :qq {:abc 
            {
                :x1 {:x "abc",:u "ee"},
                :x2 {:y "abc",:i "ee"},
                :x3 {:x "abc",:i "ee"}
        }   
        },
    :ww {:xyz {
                :y1 {:x "abc",:u "ee"},
                :y2 {:y "abc",:i "0"},
                :y3 {:x "abc",:i "ee"}
              } 
        }
}

我想检查i部分是否存在，并且在aa，qq和ww的每一个中都有值0，并且取决于排除任何操作）对aa，qq和ww。例如，如果ww在那个位置有i=0，那么得到如下的地图

I want to check whether the "i" part exist and has value "0" in each of aa,qq and ww and depending upon that exclude(or perform any operation) on aa,qq and ww. For example if "ww" has "i"="0" at that position then get a map like below

{
    :ww {:xyz {
            :y1 {:x "abc",:u "ee"},
            :y2 {:y "abc",:i "0"},
            :y3 {:x "abc",:i "ee"}
            }   
        }
}

推荐答案

user> (defn vvals [m] (when (map? m) (vals m)))
'user/vvals
user> (filter #(some #{"0"} (for [v (vvals (val %)), v (vvals v)] (:i v))) xx)
([:ww {:xyz {:y3 {:x "abc", :i "ee"}, :y2 {:y "abc", :i "0"}, :y1 {:x "abc", :u "ee"}}}])

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