Question

我正在尝试调试Rails没有解码JSON POST数据的问题。

服务器日志显示：

2011-12-14T06:44:44+00:00 app[web.2]: Started POST 
2011-12-14T06:44:44+00:00 app[web.2]:   Processing by PostsController#create as */*
2011-12-14T06:44:44+00:00 app[web.2]:   Parameters: {"{\"athlete_id\":\"\",\"known_as\":\"abc\",\"email\":\"abc@defg.com\",\"result\":\"112233\",\"rx\":false,\"mods\":\"thkjth\",\"notes\":\"\"}"=>nil, "affiliate_id"=>"testaffiliate", "wod_id"=>"12345"}

请注意，JSON字符串未被解析--Rails将其指定为哈希中的键，指向nil值。在我写一个尝试JSON.parse所有params键的before_filter之前，有没有人有任何想法？

我不认为这是相关的，因为我发送和接收数据没问题，但是在IE的CORS请求期间（使用XDomainRequest）会出现此问题。

Answer 1

您可以通过将Content-Type标头设置为“application / json”来解决此问题。您可以让Accept控制器知道它希望返回什么，并将Accept标头设置为“application / json”。

以下两个标题的命令：

curl -d '{ "company": { "name": "acme", "address": "123 Carrot Street" } }' http://0.0.0.0:3000/mysite --header "Accept: application/json" --header "Content-Type: application/json"

在日志中生成：

Started POST "/mysite" for 127.0.0.1 at 2012-01-11 16:09:48 -0800
  Processing by MyController#create as JSON
  Parameters: {"company"=>{"name"=>"acme", "address"=>"123 Carrot Street"}, "wassup"=>{"company"=>{"name"=>"acme", "address"=>"123 Carrot Street"}, "controller"=>"wassup", "action"=>"create"}}
Completed 200 OK in 5ms (Views: 2.0ms | ActiveRecord: 0.0ms)

此命令带有Accept标头：

curl -d '{ "company": { "name": "acme", "address": "123 Carrot Street" } }' http://0.0.0.0:3000/mysite --header "Accept: application/json"

生成这些日志：

Started POST "/mysite" for 127.0.0.1 at 2012-01-11 16:07:26 -0800
  Processing by MyController#create as JSON
  Parameters: {"{ \"company\": { \"name\": \"acme\", \"address\": \"123 Carrot Street\" } }"=>nil}
Completed 200 OK in 7ms (Views: 5.0ms | ActiveRecord: 0.0ms)

最后这个命令带有Content-Type标题：

curl -d '{ "company": { "name": "acme", "address": "123 Carrot Street" } }' http://0.0.0.0:3000/mysite --header "Content-Type: application/json"

生成这些日志：

Started POST "/mysite" for 127.0.0.1 at 2012-01-11 16:08:11 -0800
  Processing by MyController#create as */*
  Parameters: {"company"=>{"name"=>"acme", "address"=>"123 Carrot Street"}, "wassup"=>{"company"=>{"name"=>"acme", "address"=>"123 Carrot Street"}, "controller"=>"wassup", "action"=>"create"}}
Completed 200 OK in 4ms (Views: 2.0ms | ActiveRecord: 0.0ms)

请注意，已解析的参数和处理消息会随着每种标题类型而细微变化。

Answer 2

before_filter :fix_ie_params, only: [:create, :update]

精简：

def fix_ie_params
  if request.format == '*/*'
    # try to JSON decode in case of IE XDR
    begin

      params.merge! ActiveSupport::JSON.decode(request.body.string)

    rescue Exception=>e
      # todo: log exception
    end
  end
end

对于独角兽和 Phusion Passenger ：

def fix_ie_params
  if request.format == '*/*'
    # try to JSON decode in case of IE XDR
    begin

      request.body.rewind
      params.merge! ActiveSupport::JSON.decode(request.body.read)

    rescue Exception=>e
      # todo: log exception
    end
  end
end

Rails JSON请求未正确解析为post参数

2 个答案: