Rails 遍历深哈希数组 [英] Rails traverse deep array of hashes
问题描述
我得到了这个非常令人困惑的哈希数组作为 API 响应.
I got this very confusing array of hashes as an API response.
(完整的响应是大量的.只发布其中的一部分,但它涵盖了响应的所有元素)我怎样才能到达航空公司".
( the full response is massive. Posting only a part of it but it covers all elements of the response) How can I get to "airlines".
我试过了
<% @flight["air_search_result"]["onward_solutions"]["solution"].each do|h| %>
<strong><%=h["pricing_summary"]["total_fare"] %></strong> -
<% h["flights"]["flight"]["segments"]["segment"].each do |s| %>
<%= s['airline'] %>
<% end %> <br> <hr>
<% end %>
我收到这个错误
无法将字符串转换为整数
can't convert String into Integer
我做了一些修改,比如
<%= h["flights"]["flight"]["segments"]["segment"].first["airline"] %>
Error received - can't convert String into Integer
和
<%= h["flights"]["flight"]["segments"]["segment"][0]["airline"] %>
Error received - undefined method '[]' for nil:NilClass
有没有一种简单的方法,就像我说的那样找到一个键航空公司",并为该键返回其值.我偶然发现了这个链接,虽然我没有得到任何错误,我也没有得到任何结果.
Isnt there a simple way, like I say to find a key "airline" and for that key it returns its value. I stumbled upon this link, though I dont get any error, I also dont get any result.
谢谢.
更新
我做到了
<% h["flights"]["flight"]["segments"]["segment"].each do |o,p| %>
<% if o=="airline" %> <%= p %> <% end %>
<% end %> <br> <hr>
<% end %>
在段内没有数组的情况下,我可以获得很少的航空公司值.
例如,我可以得到离开日期时间是 2014-07-07T07:10:00 的位置,索引 = 5.
I can get few values of airlines where inside segment there is no array.
For eg, i can get where departure_date_time is 2014-07-07T07:10:00, index = 5.
http://jsfiddle.net/PP9N5/1/(向下滚动)
推荐答案
这里是一些您可以添加的代码,它们将提取与 Hash
中的任何 Hash
中的参数相等的所有键代码>:
Here is some code you can add which will extract all keys equal the parameter in any Hash
within your Hash
:
class Hash
def deep_find(query, &block)
flat_map do |key, value|
if key == query
yield value if block_given?
[value]
elsif value.is_a? Hash
value.deep_find(query, &block)
elsif value.is_a? Array
value.select { |i| i.is_a? Hash }.flat_map { |h| h.deep_find(query, &block) }
end
end
end
end
示例:
hash = {"h" => [{ 'x' => [1, 5] }, { 'x' => 2 }, { 'f' => { 'x' => [3, 4] } }], 'x' => 6 }
hash.deep_find('x') { |x| puts "#{x}" }
# [1, 5]
# 2
# [3, 4]
# 6
# => [[1, 5], 2, [3, 4], 6]
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