Jbuilder - Array到JSON

Question

我有一个名为sales的数组，其格式如下--

2015  January   2403
2015  February  2420
2015  March     2320
2015  April     2230

阵列结构- [[2015, "January", 2403], [2015, "February", 2420]]

我希望用jbuilder构造以下json响应

{
 months : ['January', 'February', 'March', 'April']
 sales :  [2403, 2420, 2320, 2230]
}

我试过的东西--

我将所有月份(以及类似的销售)映射到另一个数组中--

@months = @sales.map {|year, month, sales| [month]}

然后在jbuilder .

{"months":[["February"],["January"],["December"],["November"]]}

这不是我真正想要的，也不是很有效率

帮个忙就好了。

Answer 1

在行动中：

array = [[2015, "January", 2403], [2015, "February", 2420]]
@data = array.transpose

在.json.jbuilder模板中：

json.months @data[1]
json.sales  @data[2]

Answer 2

这是Array#transpose的一个可爱的用例。

years, months, sales = data.transpose

{
  "months": months,
  "sales": sales
}

Answer 3

require 'json'

datas = [[2015, "January", 2403], [2015, "February", 2420]]

memo = {months: [], sales: []}

datas.reduce(memo) do |memo, data|
  memo[:months] << data[1]
  memo[:sales] << data[2]
  memo
end

puts JSON.generate(memo)