表单关联：控制器同时将信息保存到 2 个模型时遇到问题

Question

对于我的项目，我正在尝试构建一个仪表板，让代理可以查看用户发布的提交并为每个提交添加状态和注释，以便记录他们自己的个人活动，即他们不会更改实际记录，只是留下私人笔记反对它。为此，我创建了一个包含 Agent id 和 Submission id 以及 Status 和 Notes 列的连接表。

我设法创建了一个索引视图，该视图显示提交数据，在我的联接表的每一行末尾有 2 个表单字段，称为状态和注释...问题是当我更新这些字段时他们没有得到保存到我的关节。

索引视图上的表单

  <%= form_with(model: submission, local: true) do |form| %>
      <% form.fields_for :agent_activities do |act| %>

      <td> <div class="field">

        <%= act.text_field :Status %>

      </div>
    </td>

    <td> <div class="field">

      <%= act.text_field :Notes %>
    </div>
  </td>
  <td>
    <div class="actions">
    <%= form.submit %>
  </div>
</td>

    <% end %>
  <% end %>

rb 文件中的模型关联

class Submission < ApplicationRecord
  belongs_to :user, :optional => true

  belongs_to :location, :optional => true

  has_many :agent_activities

end


class AgentActivity < ApplicationRecord

  belongs_to :submission, :optional => true #has submission_id 
  foreign key in table

  belongs_to :agent, :optional => true #has agent_id foreign key in 
  table


end

控制器：

 class SubmissionsController < ApplicationController
 before_action :set_submission, only: [:show, :edit, :update, :destroy]

def index
@submissions = Submission.where(:user_id => current_user.id)

end


def show
end


def new
@submission = Submission.new
end


def edit
end

# POST /submissions
# POST /submissions.json
def create
@submission = Submission.new(submission_params.merge(user_id: current_user.id))

respond_to do |format|
  if @submission.save
    # Tell the UserMailer to send a welcome email after save
    NewSubmissionMailer.submission_email(@submission).deliver_now
    NewSubmissionMailer.matching_agents_email(@submission).deliver_now

    format.html { redirect_to @submission, notice: 'Submission was successfully created.' }
    format.json { render :show, status: :created, location: @submission }
  else
    format.html { render :new }
    format.json { render json: @submission.errors, status: :unprocessable_entity }
  end
  end
 end

 # PATCH/PUT /submissions/1
 # PATCH/PUT /submissions/1.json
  def update
  respond_to do |format|
  if @submission.update(submission_params)
    format.html { redirect_to @submission, notice: 'Submission was successfully updated.' }
    format.json { render :show, status: :ok, location: @submission }
  else
    format.html { render :edit }
    format.json { render json: @submission.errors, status: :unprocessable_entity }
   end
  end

 end

# DELETE /submissions/1
# DELETE /submissions/1.json
def destroy
@submission.destroy
respond_to do |format|
  format.html { redirect_to submissions_url, notice: 'Submission was successfully destroyed.' }
  format.json { head :no_content }
  end
end

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

# Never trust parameters from the scary internet, only allow the white list through.
def submission_params
  params.require(:submission).permit(:First_Name, :Last_Name, :Phone, :Email, :Desired_Location, :number_of_beds, :number_of_occupants, :Rent_price_per_month_gbp, :Max_move_in_date, :Tenant_Occupation, :Contact_me_on, :Furnished, :Current_Address, :Property_Requirements)
end
end

不确定我在这里缺少什么：/

更新基于@TOM 的回答

新的控制器参数：

  def submission_params
  params.require(:submission).permit(:First_Name, :Last_Name, :Phone, :Email, :Desired_Location, :number_of_beds, :number_of_occupants, :Rent_price_per_month_gbp, :Max_move_in_date, :Tenant_Occupation, :Contact_me_on, :Furnished, :Current_Address, :Property_Requirements, agent_activities_attributes: [:id, :Status, :Notes, :_destroy])
end

结束

新提交模型rb：

class Submission < ApplicationRecord
 belongs_to :user, :optional => true

 belongs_to :location, :optional => true

 has_many :agent_activities

 accepts_nested_attributes_for :agent_activities

end

Index.html.erb

  <%= form_with(model: submission, local: true) do |form| %>
  <% form.fields_for :agent_activities, @submission.agent_activities.build do |act| %>
      <td> <div class="field">

        <%= act.text_field :Status %>

      </div>
    </td>

    <td> <div class="field">

      <%= act.text_field :Notes %>
    </div>
  </td>
  <td>
    <div class="actions">
    <%= form.submit %>
  </div>
</td>

    <% end %>

Answer 1

1. 在您的 Submission 模型上添加：accepts_nested_attributes_for :agent_activities (accepts_nested_attributes_for documentation) 这将使 Rails 知道您的表单将为关联模型提供字段。

2. 添加后，Rails 将在您的强参数中提供参数agent_activities_attributes 中的键，我们可以添加：.permit(..., agent_activities_attributes: [:id, :Status, :Notes, :_destroy]。仅当您计划在嵌套属性调用中使用 allow_destroy: true 时，才需要 :_destroy 键。

附注：大写名称（Status、Notes 等）通常为 Ruby 中的常量保留。您可能需要考虑将属性列名称更改为小写。