我有一个JSON对象,其中包含以下值:
@value = {"val":"test","val1":"test1","val2":"test2"}
我想在Ruby中循环遍历它以获取键/值对。当我使用@each
时,它不会迭代对象,因为它不是以Ruby的哈希形式存在的:
@value = {"val"=>"test","val1"=>"test1","val2"=>"test2"}
如何将上述JSON对象转换为Ruby哈希表?
require 'json'
value = '{"key_1":"value_1", "key_2":"value_2"}'
puts JSON.parse(value) # => {"key_1"=>"value_1","key_2"=>"value_2"}
你还可以使用Rails的 with_indifferent_access
方法,这样你就可以使用符号或字符串访问正文。
value = '{"val":"test","val1":"test1","val2":"test2"}'
json = JSON.parse(value).with_indifferent_access
json[:val] #=> "test"
json["val"] #=> "test"
[]
方法,使得从JSON解码和编码变得非常简单和透明。require 'json'
hash = {"val":"test","val1":"test1","val2":"test2"} # => {:val=>"test", :val1=>"test1", :val2=>"test2"}
str = JSON[hash] # => "{\"val\":\"test\",\"val1\":\"test1\",\"val2\":\"test2\"}"
str
现在包含了JSON编码的hash
。
使用以下方法很容易将其反转:
JSON[str] # => {"val"=>"test", "val1"=>"test1", "val2"=>"test2"}
to_s
方法,并在其中将对象转换为哈希,然后使用to_json
方法对其进行处理。%q{hsh}
标记中。这似乎会自动添加所有必要的转义文本,就像WarHog的答案一样。require 'nice_hash'
my_string = '{"val":"test","val1":"test1","val2":"test2"}'
# on my_hash will have the json as a hash, even when nested with arrays
my_hash = my_string.json
# you can filter and get what you want even when nested with arrays
vals = my_string.json(:val1, :val2)
# even you can access the keys like this:
puts my_hash._val1
puts my_hash.val1
puts my_hash[:val1]
value = '{"val":"test","val1":"test1","val2":"test2"}'
可以更易读。 - luckykrrish