Question

我在保存Classroom_Students方面遇到了麻烦。表单识别正确的参数，它们不会保存到数据库中。我知道有类似的问题，但没有一个答案（我见过）解决了我的问题。

错误讯息：

未经许可的参数：student_ids

我正在尝试通过classroom_students表格将学生添加到课堂中

// Classroom.rb

has_many :classroom_students
  has_many :students, through: :classroom_students
  accepts_nested_attributes_for :classroom_students

// Student.rb

has_many：classroom_students has_many：教室，通过:: classroom_students

// ClassroomStudent.rb（连接表）

 belongs_to :classroom
    belongs_to :student

//课堂控制器

def classroom_params
    params.require(:classroom).permit(:name, :description, :teacher_id, 
    classroom_student_attributes:[:student_ids => []])
  end

顺便说一句，所有其他属性都保存在教室的数据库中。

//创建教室的表单

<%= simple_form_for @classroom do |f| %>
  <%= f.input :name %>
  <%= f.input :description %>
  <%= f.simple_fields_for :classroom_students do |classroom_students| %>
      <%= f.association :students, as: :check_boxes %>
  <% end %>
  <%= f.button :submit %>
<% end %>

显示所有学生姓名，提交表格时，会在课堂下阅读。

Parameters: {"utt8"=>"✓", "authenticity_token"=>"jklqjwerqjfeiqwjrkljfa231=", "classroom"=>{"name"=>"Not Violin Class", "description"=>"It's not", "student_ids"=>["1", "3", ""]}, "commit"=>"Create Classroom"}
User Load (0.2ms)  SELECT  "users".* FROM "users" WHERE "users"."id" = ?  ORDER BY "users"."id" ASC LIMIT 1  [["id", 9]]
Unpermitted parameter: student_ids
   (0.2ms)  begin transaction
  SQL (0.4ms)  INSERT INTO "classrooms" ("name", "description", "teacher_id") VALUES (?, ?, ?)  [["name", "Not Violin Class"], ["description", "Please Please Please"], ["teacher_id", 9]]
   (11.2ms)  commit transaction

任何反馈意见都会受到赞赏，我还没有想到这一点。谢谢。

Answer 1

未经许可的参数：student_ids

您要在student_ids哈希中发送classromm，您需要将其发送到classroom_students哈希

更改此

<%= f.simple_fields_for :classroom_students do |classroom_students| %>
  <%= f.association :students, as: :check_boxes %>
<% end %>

到

<%= f.simple_fields_for :classroom_students do |classroom_students| %>
  <%= classroom_students.association :students, as: :check_boxes %>
<% end %>

此外，classroom_student_attributes应为classroom_students_attributes

def classroom_params
  params.require(:classroom).permit(:name, :description, :teacher_id, classroom_students_attributes: [:student_ids => []])
end

<强> 更新

协会：未找到学生

这是因为classroom_student上的关联是belongs_to :student，所以此行

<%= classroom_students.association :students, as: :check_boxes %>

应该是

<%= classroom_students.association :student, as: :check_boxes %>

未允许的参数：嵌套表单中的student_ids

1 个答案: