从JBuilder中的哈希生成JSON数组

Question

给定以下Ruby数据结构:

data = { :a => 1, :b => 2 }

...我想创建以下JSON:

{"result":[
  {"letter":"a","number":"1"},
  {"letter":"b","number":"2"}
]}

如何使用Rails的JBuilder实现这一目标？

理想情况下,我想直接从Hash转到JBuilder对象,而不是先将Hash转换为数组.

Answer 1

这很简单.

require 'jbuilder'

data = { :a => 1, :b => 2 }

out = Jbuilder.encode do |json|
    json.result data do |kv|
        json.letter kv[0]
        json.number kv[1]
    end
end

puts out  #=> {"result":[{"letter":"a","number":1},{"letter":"b","number":2}]}