Question

如果Spree::Admin::ResourceController，我想完全删除相应的行。

找到截图以便更好地理解，如下所示;

index.html.erb

tquantity = 0

purchases_controller.rb

<div class="col-md-10 col-md-offset-1">

        <div class="table-responsive myTable">

            <table class="table listing text-center">
                <tr class="tr-head">
                    <td>DESCRIPTION</td>
                    <td>COLOR</td>
                    <td>QUANTITY</td>
                    <td>RETAIL PRICE</td>
                    <td>TOTAL AMOUNT</td>
                    <td>CARTON NO</td>
                    <td>CUSTOMER 1</td>
                    <td>CUSTOMER 2</td>
                    <td>ACTUAL QUANTITY</td>
                </tr>

                <% @purchases.each do |purchase| %>

                <tr class="tr-<%= cycle('odd', 'even') %>">

                    <td class="col-2"><%= purchase.description %></td>
                    <td class="col-1"><%= purchase.color %></td>
                    <td class="col-2"><%= purchase.quantity %></td>
                    <td class="col-2"><%= number_with_precision(purchase.rprice, :delimiter => ",", :precision => 2) %></td>        
                    <td class="col-2"><%= number_with_precision(purchase.tamount, :delimiter => ",", :precision => 2) %></td>  
                    <td class="col-2"><%= purchase.cartonno %></td>
                    <td class="col-2"><%= purchase.cus1 %></td>
                    <td class="col-2"><%= purchase.cus2 %></td>
                    <td class="col-2"><%= tquantity = purchase.quantity - purchase.cus1 - purchase.cus2 %></td>

                </tr>

                <% end %>

            </table>

        </div>
    </div>
</div>

purchase.rb

class PurchasesController < ApplicationController
        before_action :set_purchase, only: [:show, :edit, :update, :destroy]

  # GET /Stockings
  # GET /deldetails.json
  def index
    #@purchases = Purchase.all
    @purchases = Purchase.where("tquantity !=?", 0)
  end

  def import
    Purchase.import(params[:file])
    redirect_to purchases_url, notice: "Purchases imported."
  end

  # GET /purchases/1
  # GET /purchases/1.json
  def show
  end

  # GET /purchases/new
  def new
    @purchase = Purchase.new
  end

  # GET /purchases/1/edit
  def edit
  end

  # POST /purchases
  # POST /purchases.json
  def create
    @purchase = Purchase.new(purchase_params)

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

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

  # DELETE /purchases/1
  # DELETE /purchases/1.json
  def destroy
    @purchase.destroy
    respond_to do |format|
      format.html { redirect_to purchases_url, notice: 'Purchase was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

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

    # Never trust parameters from the scary internet, only allow the white list through.
    def purchase_params
      params.require(:purchase).permit(:season, :category, :articleno, :description, :color, :quantity, :rprice, :tamount, :cartonno, :cus1, :cus2, :tquantity )
    end
end

我是否需要使用SQL WHERE子句，如果是，那么我将如何获得所需的结果？

Answer 1

在update操作中，您需要检查新值是否会导致购买与您设置的删除条件相匹配。将这些更改用于update操作以实现此目的：

# PATCH/PUT /purchases/1
# PATCH/PUT /purchases/1.json
def update
  respond_to do |format|
    updated = @purchase.update(purchase_params)
    deleted = (@purchase.quantity - @purchase.cus1 - @purchase.cus2) <= 0
    if deleted
      @purchase.destroy
      format.html { redirect_to purchases_url, notice: 'Purchase was deleted.' }
      format.json { head :no_content }
    elsif updated
      format.html { redirect_to @purchase, notice: 'Purchase was successfully updated.' }
      format.json { render :show, status: :ok, location: @purchase }
    else
      format.html { render :edit }
      format.json { render json: @purchase.errors, status: :unprocessable_entity }
    end
  end
end

关于视图，如果在数据中碰巧有任何应该过滤的行，您可以使用此查询：

# GET /Stockings
# GET /deldetails.json
def index
  @purchases = Purchase.where("quantity - cus1 - cus2 > 0") # Only records with a valid total quantity
end

对于CSV导入，可以在创建Purchase模型对象之前过滤这些值。尝试更改以使用此：

def self.import(file)
  CSV.foreach(file.path, headers: true) do |row|
    if (row["quantity"].to_i - row["cus1"].to_i - row["cus2"].to_i) > 0
      Purchase.create! row.to_hash
    end
  end
end

这将消除CSV导入过程中在应用程序中创建的任何无效（零数量）购买模型对象。这假定标题字段名为“quantity”，“cus1”和“cus2”，可能需要稍微调整以匹配实际的标题字段名称。

Answer 2

我遇到了类似的问题，并使用destroy_all而不是destroy解决了这个问题。这清除了为我出现的行。如果有帮助，请告诉我。

如果实际数量变为零，则完全删除相应的行

2 个答案: