rails 4 使用新参数重定向回来 [英] rails 4 redirect back with new params

问题描述

是否可以使用查询字符串中的新参数重定向回引用网址?

Is it possible to redirect back to the referring url with a new param in the query string?

像这样:

redirect_to :back, custom_param='foo'

推荐答案

试试这个:

# get a URI object for referring url 
referrer_url = URI.parse(request.referrer) rescue URI.parse(some_default_url)
                    # need to have a default in case referrer is not given


# append the query string to the  referrer url
referrer_url.query = Rack::Utils.parse_nested_query(referrer_url.query).
                    # referrer_url.query returns the existing query string => "f=b"
                    # Rack::Utils.parse_nested_query converts query string to hash => {f: "b"}
                    merge({cp: 'foo'}).
                    # merge appends or overwrites the new parameter  => {f: "b", cp: :foo'}
                    to_query
                    # to_query converts hash back to query string => "f=b&cp=foo"



# redirect to the referrer url with the modified query string
redirect_to referrer_url.to_s
                    # to_s converts the URI object to url string

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