ruby-on-rails - 精彩的 ActiveModel::ForbiddenAttributesError

Question

我一直在使用 strong_params 并试图让创建的对象通过。我有两个问题。

您如何找出导致问题的属性？

我在下面的代码中缺少什么？

让我们从错误开始，日志什么也没告诉我。

ActiveModel::ForbiddenAttributesError in JobsController#create

只是为了傻笑，这是我认为不是很有用的日志:

Started POST "/jobs" for 127.0.0.1 at 2013-12-17 22:03:59 +0000
Processing by JobsController#create as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"Ohq4lVqPVMpjzbZwCfJNYBL78TAcoC0WZLSmpCzMD3k=", "job"=>{"job_title"=>"Junior Rails Developer", "job_description"=>"A new position getig nsomethfins lansnana", "languages"=>["", "Rails", "Ruby"], "country_code"=>"AO", "job_type"=>"Full-Time", "job_salary"=>"30000", "job_level"=>"Junior"}, "commit"=>"Create Job"}
  User Load (0.5ms)  SELECT "users".* FROM "users" WHERE "users"."id" = 1 ORDER BY "users"."id" ASC LIMIT 1
Completed 500 Internal Server Error in 8ms

ActiveModel::ForbiddenAttributesError (ActiveModel::ForbiddenAttributesError):

有道理，但如果我看看我的创造:

def create
    binding.pry
    @job = Job.new(job_params)

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

强参数:

 def job_params
      params.require(:job).permit(:job_title, :job_level, :job_description, :job_salary,
                                  :country_code, :job_type, :state, :languages => [])
    end

我主要感兴趣的是如何找出 future 的问题所在，因为它似乎是大海捞针错误。

Answer 1

在您的日志文件中，它显示了应用程序从创建中获取的参数:

Parameters: {"utf8"=>"✓", "authenticity_token"=>"Ohq4lVqPVMpjzbZwCfJNYBL78TAcoC0WZLSmpCzMD3k=", "job"=>{"job_title"=>"Junior Rails Developer", "job_description"=>"A new position getig nsomethfins lansnana", "languages"=>["", "Rails", "Ruby"], "country_code"=>"AO", "job_type"=>"Full-Time", "job_salary"=>"30000", "job_level"=>"Junior"}, "commit"=>"Create Job"}

您需要首先确保每个参数都列在您的强参数定义中。然后确保每个参数都是正确的类型。

:parameter          #accepts a single entry
:parameter => []    #accepts a hash
:paramters_attributes: [:firstattribute, :secondattribute]  #accepts nested parameters

您的语言参数在日志中显示为散列，但您的允许参数中只有 :languages。更改参数以接受散列应该可以解决问题。

:languages => []

此外，此博客文章通过示例显示一些强大的参数很有帮助:
http://blog.sensible.io/2013/08/17/strong-parameters-by-example.html