ruby - Ruby uniq 是否适用于具有嵌套元素的哈希数组

Question

我有一个散列数组，在每个散列中我都有一个嵌套结构，如下所示:

{
        "id" : "RZ60586_5836f1ed468e5d0004000015",
        "status" : "live",
        "phases" : [
            {
                "phase" : "main_phase",
                "elements" : [
                    {
                        "banner_id" : "5836f1ed468e5d0004000015_widesky_light",
                        "split_var" : "light",
                        "reports" : [ ]
                    },
                    {
                        "banner_id" : "5836f1ed468e5d0004000015_widesky_light",
                        "split_var" : "light",
                        "reports" : [ ]
                    },
                    {
                        "banner_id" : "5836f1ed468e5d0004000015_widesky_light",
                        "split_var" : "light",
                        "reports" : [ ]
                    },
                    {
                        "banner_id" : "5836f1ed468e5d0004000015_widesky_light",
                        "split_var" : "light",
                        "reports" : [ ]
                    },
                    {
                        "banner_id" : "5836f1ed468e5d0004000015_widesky_light",
                        "split_var" : "light",
                        "reports" : [ ]
                    },
                    {
                        "banner_id" : "5836f1ed468e5d0004000015_widesky_light",
                        "split_var" : "dark",
                        "reports" : [ ]
                    },
                    {
                        "banner_id" : "5836f1ed468e5d0004000015_widesky_light",
                        "split_var" : "dark",
                        "reports" : [ ]
                    },
                    {
                        "banner_id" : "5836f1ed468e5d0004000015_widesky_light",
                        "split_var" : "dark",
                        "reports" : [ ]
                    },
                    {
                        "banner_id" : "5836f1ed468e5d0004000015_widesky_light",
                        "split_var" : "dark",
                        "reports" : [ ]
                    },
                    {
                        "banner_id" : "5836f1ed468e5d0004000015_widesky_light",
                        "split_var" : "dark",
                        "reports" : [ ]
                    }
                ]
            }
        ]
    }

这是将位于数组内部的散列示例。如果我在此数组上使用 uniq(它的变化只会发生在 reports 数组内):

{
                        "banner_id" : "5836f1ed468e5d0004000015_widesky_light",
                        "split_var" : "dark",
                        "reports" : [ ]
                    }

所以，问题是，我有多大把握在使用 uniq 时不会丢失任何数据？

Answer 1

数组和散列在测试相等性时(uniq 所做的)逐个元素进行比较。

如果两个数组各自的元素相等，则认为两个数组相等。当两个散列具有相同的键集并且每个键的值等于另一个散列中的值时，它们被认为是相等的。

因此，如果 reports 值不同，uniq 不会删除您的哈希值。