创建散列迭代对象数组

Question

我有一个具有属性的对象name和data等等.我想创建一个哈希,它使用名称作为键,数据(数组)作为值.我无法弄清楚如何减少下面的代码使用map.可能吗？

def fc_hash
  fcs = Hash.new
  self.forecasts.each do |fc|
    fcs[fc.name] = fc.data
  end
  fcs
end

Answer 1

用途Hash[]:

Forecast = Struct.new(:name, :data)
forecasts = [Forecast.new('bob', 1), Forecast.new('mary', 2)]
Hash[forecasts.map{|forecast| [forecast.name, forecast.data]}]
# => {"mary"=>2, "bob"=>1}

Answer 2

def fc_hash
 forecasts.each_with_object({}) do |forecast, hash|
    hash[forecast.name] = forecast.data
  end
end