如何从我的 Ruby on Rails API 解析这些哈希转换为字符串，以便它可以作为 object 在 Z9E1713B69D1D24ADA9 中访问

Question

The data is stored as an array of objects wrapped in a string that looks like this

["{\"x\"=>15, \"y\"=>7}", "{\"x\"=>14, \"y\"=>7}", "{\"x\"=>13, \"y\"=>7}", "{\"x\"=>13, \"y\"=>6}", "{\"x\"=>13, \"y\"=>5}", "{\"x\"=>13, \"y\"=>4}", "{\"x\"=>13, \"y\"=>3}", "{\"x\"=>12, \"y\"=>3}", "{\"x\"=>11, \"y\"=>3}"] 

The reason it is stored that way is because when I was storing the data from a json, I had to convert what was wrapped in Action Parameters to a hash.

I took a look at How to convert a ruby hash object to JSON? and Parse JSON in JavaScript? , and my answer is not addressed.

First, the problem is that it would seem JSON does not parse anything wrapped in double quotations, nor with rocket hash notation, and so I am not able to convert to convert "{"x"=>15, "y"=>7}" to {"x"=>15, "y"=>7} .

Perhaps, I have to serialize the object, see where I get my data from here: How can I access the data for the snake object sent through JSON in my params?

Any ideas on what the right approach would be?

Answer 1

The reason you're not able to convert to JSON because hash rocket is not a proper JSON syntax. Hash rocket is purely Ruby syntax.

What that means is that you somehow managed to take a Hash and convert it to a String . So the converted string is actually Ruby code and not JSON.

You could do...

eval("{\"x\"=>15, \"y\"=>7}")

... and it will return a Ruby Hash .

Or if you don't want to use eval due to security reasons, you can do...

JSON.parse("{\"x\"=>15, \"y\"=>7}".gsub('=>', ':'))

Answer 2

Following radiantshaw's lead, using either

eval("{\"x\"=>15, \"y\"=>7}")

or

JSON.parse("{\"x\"=>15, \"y\"=>7}".gsub('=>', ':'))

I got the following: {"x"=>15, "y"=>7} , which is a Ruby object. However in order to convert this to a Javascript object, I also needed to convert it to json.

So by taking it one step further, I am able to parse it into json like so:

Put require 'json' in the.rb file, and then do {"x"=>15, "y"=>7}.to_json which will result in

"{\"x\":15,\"y\":7}" .