访问Ruby哈希变量 [英] Access Ruby hash variables

问题描述

  put'/ user_list /：user_id' do 
 puts request.params [model] 
 end 
  

返回以下

  {password：36494092d7d5682666ac04f62d624141，username：nicholas，user_id：106， firstname：Nicholas，email：[e-mail]，is_admin：0，lastname：Rose，privileges：} 
  

现在我很难访问每个值的值。它似乎并不是真正的哈希格式，所以我真的不能这样做。

$ $ $ $ $ $ $ $ $ request.params [model] [：密码]

它只是返回零。

我只需要知道我可以做些什么来访问这些变量，或者如何配置我的请求参数，以便以良好格式访问变量。 >解决方案

试试 request.params [model] [password] $ b <一个 Hash 的键可以由符号和字符串组成。但是，字符串键与符号键不同。

请注意以下几点：

  h = {：name => 'Charles'，name=> 'Something else'} 
 h [：name]＃=> 'Charles'
 h [name]＃=> 'Something else'
  

编辑：

在特定情况下，它显示为 request.params [model] 返回一个字符串而不是散列。有一种方法 String＃[] 这是获取子串的方法。

  s =冬天来了
 s [Winter]＃=> 冬天
 s [Summer]＃=>无
  

这会解释您的评论。

您可以采取一些措施来纠正您的具体情况。我找到了使用 JSON 最简单的方法。 （我确信还有其他人，也许这些将通过其他答案或通过评论。）

  require'json'
 hash_of_params = JSON.load（request.params [model]）。to_hash 
 hash_of_params [password]＃=> 36494092d7d5682666ac04f62d624141
  

I am pretty new to ruby and sinatra but basically I have this route:

put '/user_list/:user_id' do
    puts request.params["model"]
end

and it returns the following

{"password":"36494092d7d5682666ac04f62d624141","username":"nicholas","user_id":106,"firstname":"Nicholas","email":"[e-mail]","is_admin":0,"lastname":"Rose","privileges":""}

I am now having a hard time accessing values of each of those. It doesn't really seem to be in hash format so I can't really do

request.params["model"][:password]

It just returns nil..

I just need to know what I can do to access those variables, or how to configure my request parameters to be in a good format to access variables.

解决方案

Try request.params["model"]["password"]

A Hash's keys can consist of both symbols and strings. However, a string key is different than a symbol key.

Note the following:

h = {:name => 'Charles', "name" => 'Something else'}
h[:name] #=> 'Charles'
h["name"] #=> 'Something else'

EDIT:

In your particular situation, it appears request.params["model"] returns a string instead of a hash. There is a method String#[] which is a means of getting a substring.

s = "Winter is coming"
s["Winter"] #=> "Winter"
s["Summer"] #=> nil

This would explain your comments.

There are a couple things you can do to remedy your specific situation. I have found the most simplest way to be using JSON. (I'm sure there are others and maybe those will surface through other answers or through comments.)

require 'json'
hash_of_params = JSON.load(request.params["model"]).to_hash
hash_of_params["password"] #=> "36494092d7d5682666ac04f62d624141"

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