Question

我正在关注http://railscasts.com/episodes/396-importing-csv-and-excel的上半部分来上传CSV文件并在我的rails应用中创建新的“示例”。

我正在尝试创建一个只显示当前用户样本的mysamples页面。到目前为止，如果我通过表单一次添加一个样本，它将显示在此页面上。

但是当我上传CSV时，新样本没有与用户关联。

有关最佳方法的建议吗？

感谢您的帮助。

Sample_Controller.rb

class SamplesController < ApplicationController
 before_action :set_sample, only: [:show, :edit, :update, :destroy]
 after_action :verify_authorized

respond_to :html
def home
  @samples = Sample.all
  authorize @samples 
end

def admin_only
end

def index
  @q = Sample.search(params[:q])
  @samples = @q.result(distinct: true).order("created_at DESC").paginate(:page    => params[:page], :per_page => 10 )
  respond_with(@samples)
  authorize @samples
end

def mysample
  @samples = Sample.all
  authorize @samples
end

def import
  @samples = Sample.all
  if params[:file].present?
  Sample.import(params[:file], params[:user_id])
  redirect_to root_url, notice: "Samples Imported"
  else
  redirect_to root_url, notice: "You need to choose a file first!"
  end
  authorize @samples
end

def show
  respond_with(@sample)
end

def new
  @sample = Sample.new
  respond_with(@sample)
  authorize @sample
end

def edit
end

def create
  params[:sample][:user_id] = current_user.id
  @sample = Sample.new(sample_params)
  authorize @sample
  if @sample.save
    redirect_to @sample, notice: 'Sample was successfully created.'
  else
    render action: 'new'
 end
end

def update
  if @sample.update(sample_params)
  redirect_to @sample, notice: 'Sample was successfully updated.'
else
  render action: 'edit'
end

端

def destroy
  @sample.destroy
  authorize @sample
  respond_with(@sample)
end

private
  def set_sample
    @sample = Sample.find(params[:id])
    authorize @sample
  end

  def sample_params
    params.require(:sample).permit(:line, :season, :style, :color, :date_out, :to_who, :date_in, :location,:user_id)
  end

端

Sample.rb模型

class Sample＆lt;的ActiveRecord :: Base的 belongs_to：user

def self.import(file, user_id)
    CSV.foreach(file.path, headers: true) do |row|
        Sample.create! row.to_hash
    end
  end
end

mysample.html.erb

<div class="container">

<% @samples.each do |sample| %>
    <% if sample.user == current_user %>
          <div class="row sample"> 

            <div class="col-md-4">
              <strong>Line</strong>
              <%= sample.line %>
            </div>

            <div class="col-md-4">
              <strong>Season</strong>
              <%= sample.season %>
            </div>
            <div class="col-md-4">
               <strong>Style</strong>
              <%= sample.style %>
            </div>
          </div>
          <div class="row"> 
            <div class="col-md-4">
               <strong>Color</strong>
              <%= sample.color%>
            </div>

            <div class="col-md-4">
               <strong>Date Out</strong>
              <%= sample.date_out %>
            </div>

            <div class="col-md-4">
               <strong>To Who</strong>
              <%= sample.to_who %>
            </div>
          </div>
          <div class="row"> 
            <div class="col-md-4">
               <strong>Date In</strong>
              <%= sample.date_in %>
            </div>
            <div class="col-md-4">
               <strong>Location</strong>
              <%= sample.location %>
            </div>

            <div class="col-md-4 bottom">
             <%= link_to 'Check In | Out', edit_sample_path(sample), class: "btn btn-md btn-default"  %>
            </div>
          </div>
          <% end %>
        <% end %>


</div>

编辑我使用byebug来逐步完成模型并且没有任何错误。但是我最后一次这样做了，我退出了byebug，关闭了服务器，重启了它并点击了这个网址上的刷新http://localhost:3000/samples/import

这导致我没见过的错误。 enter image description here

Answer 1

您没有传入用户ID，因此将user_id合并到您的哈希：

def self.import(file, user_id)
    CSV.foreach(file.path, headers: true) do |row|
        Sample.import(params[:file], current_user.id)
    end
  end
end

您可以找到该用户，并通过关联来确保用户存在 - 您希望如何处理它不存在我留给您。使用find_by所以它不会抛出一个未找到活动记录的错误，如果你想要那么只需使用find。

def self.import(file, user_id)
    user = User.find_by(id: user_id)
    if user
      CSV.foreach(file.path, headers: true) do |row|
        user.samples.create! row.to_hash
      end
    end
  end
end

将上传的CSV文件中的行与rails中的用户相关联

1 个答案: