如何从哈希中获取数据? [英] How do I get data from a hash?

问题描述

考虑到这个哈希值 :params

Given this hash that comes though :params

"positions"=>{
    "1"=>{"x"=>"50", "y"=>"30"}, 
    "2"=>{"x"=>"22", "y"=>"53"}, 
    "3"=>{"x"=>"68", "y"=>"35"}
 }

我该怎么做?(不起作用，但试图展示我想做什么)

How would I do this? (doesn't work, but attempting to show what I want to do)

params[:positions].each do |position|
  logger.info(position.x)
end

我知道，初学者的东西很痛苦......

I know, painfully beginner stuff ...

我得到一个 NoMethodError(未定义方法 'x' for ["1", {"x"=>"50", "y"=>"30"}]:Array)

推荐答案

我想你想要的是

params[:positions].each do |index, coords|
  logger.info(coords['x'])
end

如果你不关心索引，你也可以使用 params[:positions].values.each do |coords| 代替.

If you don't care about the indexes, you could also just use params[:positions].values.each do |coords| instead.

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