这对于普通哈希来说很简单
{:a => "a", :b => "b"}
这就意味着
"a=a&b=b"
但是你怎么处理更复杂的东西，比如
{:a => "a", :b => ["c", "d", "e"]}
这应该转化为
"a=a&b[0]=c&b[1]=d&b[2]=e"
或者更糟的是，(该怎么做)像这样的事情:
{:a => "a", :b => [{:c => "c", :d => "d"}, {:e => "e", :f => "f"}]
非常感谢你的帮助!
当前回答
我喜欢使用这个宝石:
https://rubygems.org/gems/php_http_build_query
示例用法:
puts PHP.http_build_query({"a"=>"b","c"=>"d","e"=>[{"hello"=>"world","bah"=>"black"},{"hello"=>"world","bah"=>"black"}]})
# a=b&c=d&e%5B0%5D%5Bbah%5D=black&e%5B0%5D%5Bhello%5D=world&e%5B1%5D%5Bbah%5D=black&e%5B1%5D%5Bhello%5D=world
其他回答
class Hash
def to_params
params = ''
stack = []
each do |k, v|
if v.is_a?(Hash)
stack << [k,v]
elsif v.is_a?(Array)
stack << [k,Hash.from_array(v)]
else
params << "#{k}=#{v}&"
end
end
stack.each do |parent, hash|
hash.each do |k, v|
if v.is_a?(Hash)
stack << ["#{parent}[#{k}]", v]
else
params << "#{parent}[#{k}]=#{v}&"
end
end
end
params.chop!
params
end
def self.from_array(array = [])
h = Hash.new
array.size.times do |t|
h[t] = array[t]
end
h
end
end
{:a=>"a", :b=>"b", :c=>"c"}.map{ |x,v| "#{x}=#{v}" }.reduce{|x,v| "#{x}&#{v}" }
"a=a&b=b&c=c"
还有另一种方法。对于简单的查询。
如果你在法拉第请求的上下文中，你也可以只是传递params哈希作为第二个参数，法拉第会照顾到正确的param URL部分:
faraday_instance.get(url, params_hsh)
2.6.3 :001 > hash = {:a => "a", :b => ["c", "d", "e"]}
=> {:a=>"a", :b=>["c", "d", "e"]}
2.6.3 :002 > hash.to_a.map { |x| "#{x[0]}=#{x[1].class == Array ? x[1].join(",") : x[1]}"
}.join("&")
=> "a=a&b=c,d,e"
更新:此功能已从gem中移除。
朱利安，你自己的回答很好，我无耻地借鉴了它，但它不能正确地逃脱保留字符，还有一些其他的边缘情况，它会崩溃。
require "addressable/uri"
uri = Addressable::URI.new
uri.query_values = {:a => "a", :b => ["c", "d", "e"]}
uri.query
# => "a=a&b[0]=c&b[1]=d&b[2]=e"
uri.query_values = {:a => "a", :b => [{:c => "c", :d => "d"}, {:e => "e", :f => "f"}]}
uri.query
# => "a=a&b[0][c]=c&b[0][d]=d&b[1][e]=e&b[1][f]=f"
uri.query_values = {:a => "a", :b => {:c => "c", :d => "d"}}
uri.query
# => "a=a&b[c]=c&b[d]=d"
uri.query_values = {:a => "a", :b => {:c => "c", :d => true}}
uri.query
# => "a=a&b[c]=c&b[d]"
uri.query_values = {:a => "a", :b => {:c => "c", :d => true}, :e => []}
uri.query
# => "a=a&b[c]=c&b[d]"
宝石是“可寻址的”
gem install addressable
