Question

我有Classroom，Instructor，Task和Trainee模型，我试图通过使用多个has_many通过关联的Credit连接模型进行关联。 Credit模型中的每条记录都有一个task_id，trainee_id，instructor_id和classroom_id。

class Classroom < ActiveRecord::Base
  has_many :credits, dependent: :destroy
  has_many :trainees, through: :credits
  has_many :instructors, through: :credits
  has_many :tasks, through: :credits

  accepts_nested_attributes_for :credits
end

class Instructor < ActiveRecord::Base
  has_many :credits
  has_many :classrooms, through: :credits
  has_many :trainees, through: :credits
  has_many :tasks, through: :credits
end

class Task < ActiveRecord::Base
  has_many :credits
  has_many :classrooms, through: :credits
  has_many :trainees, through: :credits
  has_many :instructors, through: :credits
end

class Trainee < ActiveRecord::Base
  has_many :credits
  has_many :classrooms, through: :credits
  has_many :instructors, through: :credits
  has_many :tasks, through: :credits
end

class Credit < ActiveRecord::Base
  belongs_to :classroom
  belongs_to :instructor
  belongs_to :trainee
  belongs_to :task
end

我希望能够通过新的Classrooms表单在我的连接模型中创建多个记录。例如，当我选择一个教师（选择框），三个学生（复选框）和三个任务（复选框）时，我将创建9个记录，每个记录包含task_id，trainee_id，instructor_id和classroom_id。我正在寻找的解决方案将遍历每个培训生和任务，以获得多个完整的记录。

<%= bootstrap_form_for :classroom, url: classrooms_path do |f| %>

        <%= f.text_field :title %>
        <%= f.text_field :location %>
        <%= f.date_select :date %>
        <%= f.time_select :start_time, label: "Start Time" %>
        <%= f.time_select :end_time, label: "End Time" %>

        <%= f.select :instructor_ids, Instructor.all.collect {|x| [x.rank + " " + x.last_name, x.id]}, {} %>

        <table class="table table-sm">
          <tr>
            <th>Trainee</th>
            <th>Battery</th>
            <th>Crew</th>
            <th>Position</th>
            <th>Add</th>
          </tr>

          <% Trainee.all.each do |trainee| %>
            <tr>
              <td><%= trainee.rank %> <%= trainee.first_name %> <%= trainee.last_name %></td>
              <td><%= trainee.battery %></td>
              <td><%= trainee.crew %></td>
              <td><%= trainee.position %></td>
              <td><%= check_box_tag :trainee_ids, trainee.id, @classroom.trainees.include?(trainee), :name => 'classroom[trainee_ids][]' -%></td>
            </tr>
          <% end %>

          <tr>
            <th></th>
            <th></th>
            <th></th>
            <th></th>
            <th></th>
          </tr>

          <tr>
            <th>Task</th>
            <th></th>
            <th></th>
            <th></th>
            <th>Add</th>
          </tr>

          <% Task.all.each do |task| %>
            <tr>
              <td><%= task.title %></td>
              <td></td>
              <td></td>
              <td></td>
              <td><%= check_box_tag :task_ids, task.id, @classroom.tasks.include?(task), :name => 'classroom[task_ids][]' -%></td>
            </tr>
          <% end %>
        </table>

        <%= f.submit "Schedule Training", class: "btn btn-success" %>

到目前为止，我已经成功地将course_id与其他选项联系起来，如下所示。但是，我无法弄清楚如何遍历每个讲师，实习生和任务组合来创建多个完整的记录。

Database Image

为了完整起见，我在下面添加了我的教室控制器。

class ClassroomsController < ApplicationController
  def index
    @classrooms = Classroom.all
  end

  def show
    @classroom = Classroom.find(params[:id])
  end

  def new
    @classroom = Classroom.new
  end

  def edit
    @classroom = Classroom.find(params[:id])
  end

  def create
    @classroom = Classroom.new(classroom_params)

    if @classroom.save
      redirect_to classrooms_path
    else
      render 'new'
    end
  end

  def update
    @classroom = Classroom.find(params[:id])

    if @classroom.update(classroom_params)
      redirect_to classrooms_path
    else
      render 'edit'
    end
  end

  def destroy
    @classroom = Classroom.find(params[:id])
    @classroom.destroy

    redirect_to classrooms_path
  end

  private
    def classroom_params
      params.require(:classroom).permit(:title, :location, :date, :start_time, :end_time, :instructor_ids, trainee_ids: [], task_ids: [])
    end
end

我一直在寻找解决方案，但似乎没有任何东西适合。有没有办法做多个for循环来使这个工作？我认为这会发生在控制器中，但我不确定如何实现这一点。谢谢。

如何通过一个表单上的单个联接表关联四个模型？

0 个答案: