将上传的 CSV 文件中的行与 rails 中的用户相关联

Question

我正在按照 http://railscasts.com/episodes/396-importing-csv-and-excel 的前半部分上传 CSV 文件并在我的 rails 应用程序中创建新的 "samples"。

我正在尝试创建一个仅呈现当前用户示例的 mysamples 页面。到目前为止，如果我通过表格一次添加一个示例，它将显示在此页面上。

但是当我上传 CSV 文件时，新样本没有与用户相关联。

有什么关于最好的方法的建议吗？

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

结束

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

结束

Sample.rb 型号

class 样本 < ActiveRecord::Base belongs_to：用户

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>

EDIT 我使用 byebug 单步调试模型，没有出现任何错误。但是上次我这样做时，我退出了 byebug，关闭了服务器，然后重新启动它并在此 url http://localhost:3000/samples/import

上刷新

这导致了一个我没见过的错误。

Answer 1

您没有传递用户 ID，因此请将 user_id 合并到您的散列中：

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

您可以找到用户并通过关联来确保用户存在——您希望如何处理不存在的用户，我留给您。使用 find_by 这样它就不会抛出未找到活动记录的错误，如果您需要，则只需使用 find 即可。

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

Associating rows from uploaded CSV files with a User in rails

ruby

csv

ruby-on-rails