Rails是什么是to_query方法的反对者？

Question

我已经转过来了,使用to_query方法将hash转换为params.

如何将其变回哈希？

我试过这个:

require 'rack'
@tester = Rack::Utils.parse_nested_query(params[:search])

在视图中: <%= @tester.class %>

这给了NilClass.

参数是:

"search"=>"fields%5B%5D=exhb_0&fields%5B%5D=exh0_1&fields%5B%5
D=t_g_a&fields%5B%5D=hp_1&fields%5B%5D=s1&fields%5B%5D=overflade_0&railing%5B%5D
=A-3&railing_m=0&type%5B%5D=ltrappa&wood%5B%5D=wood_6"

Answer 1

这是这个问题的重复:只需使用:

Rack::Utils.parse_query(my_query_string)

为了解码示例中的行,请务必先取消字符串:

require 'rack'

my_string = 'fields%5B%5D=exhb_0&fields%5B%5D=exh0_1&fields%5B%5D=t_g_a&fields%5B%5D=hp_1&fields%5B%5D=s1&fields%5B%5D=overflade_0&railing%5B%5D=A-3&railing_m=0&type%5B%5D=ltrappa&wood%5B%5D=wood_6'

unescaped_string = URI.unescape(my_string)
# => "fields[]=exhb_0&fields[]=exh0_1&fields[]=t_g_a&fields[]=hp_1&fields[]=s1&fields[]=overflade_0&railing[]=A-3&railing_m=0&type[]=ltrappa&wood[]=wood_6"

params_hash = Rack::Utils.parse_query(unescaped_string)
# => {"fields[]"=>["exhb_0", "exh0_1", "t_g_a", "hp_1", "s1", "overflade_0"], "railing[]"=>"A-3", "railing_m"=>"0", "type[]"=>"ltrappa", "wood[]"=>"wood_6"}