Question

在我的应用中，survey和question之间存在has_many：through关系：

class Survey < ActiveRecord::Base
  has_many :answers, dependent: :destroy
  has_many :questions, through: :answers
end

class Question < ActiveRecord::Base
  has_many :answers, dependent: :destroy
  has_many :surveys, through: :answers
end

class Answer < ActiveRecord::Base
  belongs_to :survey
  belongs_to :question
end

我有一个表单可以添加一个包含question复选框的新调查表：

= form_for @survey, html: { class: "form-horizontal"} do |f|
  = render "layouts/messages", target: @survey
  .form-group
    = f.label I18n.t('.survey.form.name')
    = f.text_field :name, class: "form-control"
  .form-group
    = f.label I18n.t('.survey.form.questions')
    %ul
      = hidden_field_tag "survey[question_ids][]", nil
      - @questions.each do |question|
        %li.checkbox
          = check_box_tag "survey[question_ids][]", question.id, @survey.question_ids.include?(question.id)
          = question.intro
  .form-group
    .controls
      = f.submit(class: 'btn btn-default', value: I18n.t('.general.form.save'))

survey控制器create操作如下所示：

 def create
    @survey = Survey.new(survey_params)
    if @survey.save
      redirect_to surveys_path, notice: I18n.t('.survey.messages.created')
    else
      render action: "new"
    end
 end

 private
 def survey_params
   params.require(:survey).permit(:name, :question_ids => [])
 end

当我填写表单并提交时，它将无法保存，我只在服务器日志中看到回滚：

Started POST "/surveys" for ::1 at 2015-05-24 12:29:00 +0200
Processing by SurveysController#create as HTML
  Parameters: {"utf8"=>"✓", "survey"=>{"name"=>"fdfdfd", "question_ids"=>["", "1", "2"]}, "commit"=>"Opslaan"}
   (0.3ms)  BEGIN
   (0.2ms)  ROLLBACK

那我在这里做错了什么？

Answer 1

尝试

@survey = Survey.build(survey_params)

SurveysController中的

。

Answer 2

似乎这是验证错误。尝试将save临时替换为save!。它应该导致异常，它使您能够调查问题的更多细节。

拥有并属于许多形式不起作用

2 个答案: