Question

问题：

当我编辑嵌套模型的内容时，它会保存新条目，而不是编辑已存在的条目。

模特：

# job.rb
class Job < ActiveRecord::Base
    # Relations
    has_many :logs, :dependent => :destroy

    accepts_nested_attributes_for :logs, allow_destroy: true, reject_if: proc { |a| a['user_id'].blank? }
end


# log.rb
class Log < ActiveRecord::Base
    belongs_to :job
    belongs_to :user

    # a single user should not be logged more than once per job
    validates :user_id, uniqueness: { scope: :job_id }
end


# user.rb
class User < ActiveRecord::Base
    has_many :logs

    validates_presence_of :name

    def self.all_active
        User.where( active: 1 )
    end

end

作业控制器：

class JobsController < ApplicationController
before_action :set_job, only: [:show, :edit, :update, :destroy]

def index
  @jobs = Job.all
end

def show
end

def new
  @job = Job.new
  10.times { @job.logs.build }
end

def edit
  ( @job.people - @job.logs.count ).times { @job.logs.build }
end

def create
  @job = Job.new(job_params)

  # Set the admin id
  @job.logs.each do |log|
    log.admin_id = current_admin.id
  end

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

def update
  respond_to do |format|
    if @job.update(job_params)
      format.html { redirect_to @job, notice: 'Job was successfully updated.' }
      format.json { render :show, status: :ok, location: @job }
    else
      format.html { render :edit }
      format.json { render json: @job.errors, status: :unprocessable_entity }
    end
  end
end

def destroy
  @job.destroy
  respond_to do |format|
    format.html { redirect_to jobs_url, notice: 'Job was successfully destroyed.' }
    format.json { head :no_content }
  end
end

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

  # Never trust parameters from the scary internet, only allow the white list through.
  def job_params
    params.require(:job).permit(:people, :logs_attributes => [:user_id])
  end
end

工作表格

<%= form_for(@job) do |f| %>
<% if @job.errors.any? %>
  <div id="error_explanation">
    <h2><%= pluralize(@job.errors.count, "error") %> prohibited this job from being saved:</h2>

    <ul>
    <% @job.errors.full_messages.each do |message| %>
      <li><%= message %></li>
    <% end %>
    </ul>
  </div>
<% end %>

<div class="row">
  <div class="small-3 columns"><%= f.label :people %></div>
  <div class="small-9 columns"><%= f.integer :people %></div>
</div>

<table>
  <%= f.fields_for :logs do |builder| %>
    <%= render 'logs/form', { f: builder } %>
  <% end %>
</table>

<div class="actions">
  <%= f.submit %>
</div>

Logs Partial：

<tr>
  <td>
    <%= f.label :user_id %><br>
    <%= f.collection_select(:user_id, User.all_active, :id, :name, { :prompt => 'Select User' } ) %>
  </td>
  <td>
    <%= f.label :performance %><br>
    <%= f.number_field :performance %>
  </td>
</tr>

创建工作正常。然后我去编辑条目。在作业编辑屏幕上，我看到包含所有日志以及一些剩余的空白日志条目行（由于作业控制器中的10.times @logs.build）。

现在，在没有编辑任何内容的情况下，我点击提交。我收到以下错误：

1 error prohibited this war from being saved:
  Logs user has already been taken

此外，显示原始条目，然后在它们下面是相同的确切条目重复，但由于错误“红色”。空白条目列表（从10次开始）不再显示。

但是，从编辑屏幕，如果我将所有日志的用户更改为其他用户，我将不会收到错误。它将改为使用那些新选择的用户创建新条目，而不是修改当前条目。

我希望我已经提供了足够的信息来解决这个问题！感谢

Answer 1

因此，事实证明问题是由于未将日志的:id参数列入白名单而造成的。

我改变了我的job_controller：

自：

def job_params
  params.require(:job).permit(:people, :logs_attributes => [:user_id])
end

要：

def job_params
  params.require(:job).permit(:people, :logs_attributes => [:id, :user_id])
end

这就是造成验证问题的原因！这可能太复杂了q / a来帮助任何人，但是嘿，它只是可能！

编辑包含两个唯一列的条目

1 个答案: