解析Params时发生错误

Question

我正在研究一个基本调查应用程序，用户可以在我的Android应用程序中参与调查，然后将选择发布回我的Rails服务器。在某一时刻，它将选择正确地发布到服务器，但它最近在解析参数时不断抛出错误，不再创建用户的选择。

我对HTTP比较陌生，一直在努力解决这个错误。任何帮助深表感谢！

如果我这样做卷曲要求：

curl -v -H 'Content-Type: application/json' -H 'Accept: application/json' -X POST -d {"question_id":"1","answer_id":"2"} http://ec2-54-186-132-102.us-west-2.compute.amazonaws.com:8080/questions/1/choices 

我结束了这个错误的堆栈跟踪：

Started POST "https://stackoverflow.com/questions/1/choices" for 172.31.10.156 at 2014-03-19 11:15:02 +0000 
Error occurred while parsing request parameters. 
Contents: 



ActionDispatch::ParamsParser::ParseError (795: unexpected token at 'question_id:1'): 
    actionpack (4.0.0) lib/action_dispatch/middleware/params_parser.rb:53:in `rescue in parse_formatted_parameters' 
    actionpack (4.0.0) lib/action_dispatch/middleware/params_parser.rb:32:in `parse_formatted_parameters' 
    actionpack (4.0.0) lib/action_dispatch/middleware/params_parser.rb:23:in `call' 
    actionpack (4.0.0) lib/action_dispatch/middleware/flash.rb:241:in `call' 
    rack (1.5.2) lib/rack/session/abstract/id.rb:225:in `context' 
    rack (1.5.2) lib/rack/session/abstract/id.rb:220:in `call' 
    actionpack (4.0.0) lib/action_dispatch/middleware/cookies.rb:486:in `call' 
    activerecord (4.0.0) lib/active_record/query_cache.rb:36:in `call' 
    activerecord (4.0.0) lib/active_record/connection_adapters/abstract/connection_pool.rb:626:in `call' 
    activerecord (4.0.0) lib/active_record/migration.rb:369:in `call' 
    actionpack (4.0.0) lib/action_dispatch/middleware/callbacks.rb:29:in `block in call' 
    activesupport (4.0.0) lib/active_support/callbacks.rb:373:in `_run__516066872829663058__call__callbacks' 
    activesupport (4.0.0) lib/active_support/callbacks.rb:80:in `run_callbacks' 
    actionpack (4.0.0) lib/action_dispatch/middleware/callbacks.rb:27:in `call' 
    actionpack (4.0.0) lib/action_dispatch/middleware/reloader.rb:64:in `call' 
    actionpack (4.0.0) lib/action_dispatch/middleware/remote_ip.rb:76:in `call' 
    actionpack (4.0.0) lib/action_dispatch/middleware/debug_exceptions.rb:17:in `call' 
    actionpack (4.0.0) lib/action_dispatch/middleware/show_exceptions.rb:30:in `call' 
    railties (4.0.0) lib/rails/rack/logger.rb:38:in `call_app' 
    railties (4.0.0) lib/rails/rack/logger.rb:21:in `block in call' 
    activesupport (4.0.0) lib/active_support/tagged_logging.rb:67:in `block in tagged' 
    activesupport (4.0.0) lib/active_support/tagged_logging.rb:25:in `tagged' 
    activesupport (4.0.0) lib/active_support/tagged_logging.rb:67:in `tagged' 
    railties (4.0.0) lib/rails/rack/logger.rb:21:in `call' 
    actionpack (4.0.0) lib/action_dispatch/middleware/request_id.rb:21:in `call' 
    rack (1.5.2) lib/rack/methodoverride.rb:21:in `call' 
    rack (1.5.2) lib/rack/runtime.rb:17:in `call' 
    activesupport (4.0.0) lib/active_support/cache/strategy/local_cache.rb:83:in `call' 
    rack (1.5.2) lib/rack/lock.rb:17:in `call' 
    actionpack (4.0.0) lib/action_dispatch/middleware/static.rb:64:in `call' 
    railties (4.0.0) lib/rails/engine.rb:511:in `call' 
    railties (4.0.0) lib/rails/application.rb:97:in `call' 
    rack (1.5.2) lib/rack/lock.rb:17:in `call' 
    rack (1.5.2) lib/rack/content_length.rb:14:in `call' 
    rack (1.5.2) lib/rack/handler/webrick.rb:60:in `service' 

因为这是工作之前，我想知道如果它做东西在我的控制器？我所做的唯一变化是改变用户对APPUSER虽然反映appusers是乡亲采取调查的实际数据模型：

class ChoicesController < ApplicationController 
    before_action :set_choice, only: [:show, :edit, :update, :destroy] 
    skip_before_action :verify_authenticity_token 

    def index 
    @question = Question.find(params[:question_id]) 
    end 

    # POST /choices 
    # POST /choices.json 
    def create 
    @question = Question.find(params[:question_id]) 
    @choice = @question.choices.build(choice_params) 
    @choice.answer = Answer.find(params[:choice][:answer_id]) 
    @appuser = Appuser.find_user_by_token params[:choice][:user_auth_token] 
    @appuser.choices << @choice 
    @survey = Survey.find(params[:choice][:survey_id]) 
    @survey.appusers.push(appuser) 

    respond_to do |format| 
     if @choice.save 
     format.html { redirect_to question_choices_path, notice: 'Choice was successfully created.' } 
     format.json { redirect_to question_choices_path, status: :created, location: @choice } 
     else 
     format.html { render action: 'new' } 
     format.json { render json: @choice.errors, status: :unprocessable_entity } 
     end 
    end 
    end 


    # DELETE /choices/1 
    # DELETE /choices/1.json 
    def destroy 
    @choice.destroy 
    respond_to do |format| 
     format.html { redirect_to choices_url } 
     format.json { head :no_content } 
    end 
    end 

    private 
    # Use callbacks to share common setup or constraints between actions. 
    def set_choice 
     @choice = Choice.find(params[:id]) 
    end 

    def set_question 
     @question = Question.find(params[:choice][:question_id]) 
    end 

    # Never trust parameters from the scary internet, only allow the white list through. 
    def choice_params 
     params.require(:choice).permit(:appuser_id, :answer_id, :question_id) 
    end 
end 

任何想法？我验证了JSON在jsonlint.com上是有效的（但它与之前发送的请求是相同的）。

Answer 1

中过去了，因为你有：

params.require(:choice).permit(:appuser_id, :answer_id, :question_id)

choice是必需的，你应该像这样传递你的JSON：

curl -v -H 'Content-Type: application/json' -H 'Accept: application/json' -X POST -d '{"choice": {"question_id":"1", "answer_id":"2"}}' http://ec2-54-186-132-102.us-west-2.compute.amazonaws.com:8080/questions/1/choices

Answer 2

的参数需要引号（ ''）

curl -v -H 'Content-Type: application/json' -H 'Accept: application/json' -X POST -d '{"question_id":"1","answer_id":"2"}' http://ec2-54-186-132-102.us-west-2.compute.amazonaws.com:8080/questions/1/choices 

或

curl -XPOST -H "Content-Type: application/json" http://ec2-54-186-132-102.us-west-2.compute.amazonaws.com:8080/questions/1/choices -d '{"question_id":"1","answer_id":"2"}'