如何JSON解析具有插值的ruby字符串？

Question

当我尝试将ruby字符串解析为JSON时，self.id会引发有关无效令牌的错误。

JSON.parse "{ 'description' => 'client #{self.id} has been deleted.' }"

我在对象周围尝试单引号，但这不会导致插值。如何同时获得插值和成功的JSON解析？

Answer 1

这里的问题是即使没有插值，你的字符串也是无效的JSON。

"{ 'description' => 'client has been deleted.' }"

以下是有效的JSON：

'{ "description": "client has been deleted." }'

请注意键和值周围的双引号，以及冒号:，而不是特定于ruby的散列火箭=>。

也许您正在尝试将Ruby哈希转换为json？

require 'json'
id = 5
x = { 'description' => "client #{id} has been deleted." }.to_json
puts x  # '{ "description": "client 5 has been deleted." }'

Answer 2

好像你只是想从字符串中运行一些ruby。因此，假设self.id为1：

eval "{ 'description' => 'client #{self.id} has been deleted.' }"

会屈服：

=> {"description"=>"client 1 has been deleted."}