问题
The json gem does not allow for directly encoding strings to their JSON representation. I tentatively ported this PHP code:
$text = json_encode($string);
to this Ruby:
text = string.inspect
and it seemed to do the job but for some reason if the string itself contains a literal string (it's actually JS code) with newlines, these newlines \n will stay as-is \n, not be encoded to \\n. I can understand if this is the correct behaviour of #inspect, but...
How does one encode a string value to its JSON representation in Ruby?
回答1:
As of Ruby 2.1, you can
require 'json'
'hello'.to_json
回答2:
This works with the stock 1.9.3+ standard library JSON:
require 'json'
JSON.generate('foo', quirks_mode: true) # => "\"foo\""
Without quirks_mode: true, you get the ridiculous "JSON::GeneratorError: only generation of JSON objects or arrays allowed".
回答3:
There are a myriad of JSON gems for Ruby, some pure Ruby some C-based for better performance.
Here is one that offers both pure-Ruby and C: http://flori.github.com/json/
And then its essentially:
require 'json'
JSON.encode(something)
A popular JSON encoder/decoder with native C-bindings for performance is Yajl: https://github.com/brianmario/yajl-ruby
UPD from @Stewart:
JSON.encode is provided by rails as is object.to_json. For uses outside of rails use JSON.generate which is in ruby 1.9.3 std-lib. – Stewart
来源：https://stackoverflow.com/questions/6783988/encode-a-ruby-string-to-a-json-string