红宝石访问散列元素 [英] Ruby access hash element

问题描述

我有以下散列：

{"title"=>"ga:browser=Firefox", "dimensions"=>[{:browser=>"Firefox"}], "metrics"=>[{:pageviews=>25474}], "id"=>"http://www.google.com/analytics/feeds/data?ids=ga:3906565&amp;ga:browser=Firefox&amp;start-date=2010-02-06&amp;end-date=2011-02-06", "updated"=>#<DateTime: 212163710400001/86400000,-1/3,2299161>}

我将如何打印浏览量的价值？

How would I print the value of pageviews?

推荐答案

好了，你有一个HashMap（不是数组），它映射键指标来的数组。该数组包含哈希作为其唯一元素。而该散列映射键：浏览量的值 25474 。因此，要获得该值，你可以做：

Well, you have a hashmap (not an array) which maps the key "metrics" to an array. That array contains a hash as its only element. And that hash maps the key :pageviews to the value 25474. So to get that value you can do:

the_hash["metrics"][0][:pageviews]

这假定与散：浏览量键将永远是在数组中的位置0，关键指标映射到。

This assumes that the hash with the :pageviews key will always be at position 0 in the array, which the key "metrics" is mapped to.

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