尝试从Ruby哈希中构建json
require 'json'
temp_rides = {"rides": {}}
rides = {:lyft => "car", :scoot => "scooter", :blade => "helicopter"}
rides.each do |key, value|
temp_rides["rides"].push({"key" => "value"})
puts temp_rides
end
显然,它无法通过undefined method
push'`失败,我相信我需要在追加之前加载json对象(基于我的python背景)。
我正在寻找类似这样的输出
{
"rides": {
"lyft": {
"type": "car"
},
"scoot": {
"type": "scooter"
},
"blade": {
"type": "helicopter"
}
}
}
这是对OP原始问题的回答。我对更改它以尝试回答移动目标没有兴趣。
代码
def doit(rides)
{ rides: rides.slice_before { |k,_| k.to_s.match? /\Aride\d*\z/ }.
map { |a| hashify(a.flatten.drop(1)) }.
reduce(&:merge) }
end
def hashify(arr)
f,*rest = arr
return f if rest.empty?
{ f.to_sym=>hashify(rest) }
end
示例
这里是(递归)辅助方法hashify
的使用示例:
hashify ["lyft", :type, "car"]
#=> {:lyft=>{:type=>"car"}}
我们得到了哈希rides
:
rides = {:ride1=>"lyft", :type=>"car", :ride2=>"Scoot",
:type2=>"scooter", :ride3=>"blade", :type3=>"helicopter"}
doit rides
#=> {:rides=>{:lyft=>{:type=>"car"},
# :Scoot=>{:type2=>"scooter"},
# :blade=>{:type3=>"helicopter"}}}
让我们将更多键/值对添加到rides
:
rides = {:ride1=>"lyft", :type=>"car", :color=>"blue",
:ride2=>"Scoot", :type2=>"scooter", :make=>"Vespa", :model=>"98",
:ride3=>"blade", :type3=>"helicopter"}
doit rides
#=> {:rides=>{:lyft=>{:type=>{:car=>{:color=>"blue"}}},
# :Scoot=>{:type2=>{:scooter=>{:make=>
# {:Vespa=>{:model=>"98"}}}}},
# :blade=>{:type3=>"helicopter"}}}
说明
第一个示例的步骤如下。
enum = rides.slice_before { |k,_| k.to_s.match? /\Aride\d*\z/ }
#=> #<Enumerator: #<Enumerator::Generator:0x00005a49d68217f0>:each>
我们可以看到此枚举器将其转换为数组所生成的元素。
enum.to_a
#=> [[[:ride1, "lyft"], [:type, "car"]],
# [[:ride2, "Scoot"], [:type2, "scooter"]],
# [[:ride3, "blade"], [:type3, "helicopter"]]]
继续,
a = enum.map { |a| hashify(a.flatten.drop(1)) }
#=> [{:lyft=>{:type=>"car"}},
# {:Scoot=>{:type2=>"scooter"}},
# {:blade=>{:type3=>"helicopter"}}]
h = a.reduce(&:merge)
#=> {:lyft=>{:type=>"car"}, :Scoot=>{:type2=>"scooter"},
# :blade=>{:type3=>"helicopter"}}
{ rides: h }
#=> <as above>
实际上,通过简单的转换就很容易做到:
def rejig(rides)
rides.map do |name, type|
[ name, { type: type } ]
end.to_h
end
将您的结构重新加工成所需形状的位置。
使用起来很容易:
require 'json'
rides = { lyft: "car", scoot: "scooter", blade: "helicopter" }
puts JSON.dump(rejig(rides))
# => {"lyft":{"type":"car"},"scoot":{"type":"scooter"},"blade":{"type":"helicopter"}}
它给了您undefined method push
,因为没有用于散列的此类方法。
temp_rides = {"rides": {}}
# This create a hash with `:rides` symbol as the key {:rides=>{}}
# To push an object into a hash. Use operator[]= or #store method
temp_rides[:rides][:key1] = 'value1'
temp_rides[:rides].store(:key2, 'value2')
一个工作示例:
require 'json'
temp_rides = {"rides": {}}
rides = {:lyft => "car", :scoot => "scooter", :blade => "helicopter"}
rides.each_pair do |k, v|
temp_rides[:rides][k] = {:type => v}
end
puts JSON.pretty_generate(temp_rides)
require 'json'
temp_rides = {"rides": {}}
rides = {:lyft => "car", :scoot => "scooter", :blade => "helicopter"}
temp_rides[:rides].merge!(rides)
获取ruby哈希输出
temp_rides
获取json格式输出
JSON.dump temp_rides
require 'json'
rides = {:lyft => "car", :scoot => "scooter", :blade => "helicopter"}
transformed = {
'rides' => rides.inject({}) { |h,(k,v)| h[k] = { 'type' => v }; h }
}
JSON.dump(transformed)