NameError ActionController

Question

我在以下代码中收到错误消息： PurchasesesController中的NameError #create 未初始化的常量Purchase :: PurchaseCodeID

purchase_controller.rb：

class PurchasesController < ApplicationController

    def create
        #if @memberTier = PurchaseCode.find_by(Code: 123456).Code then
            @purchase=Purchase.create(purchase_params)
            redirect_to :back
        #end
    end

    def index
        @purchases = Purchase.where(UserID: current_user.id)
        @sum = Purchase.where(UserID: current_user.id).sum(:Points)
        @redemp = Redemption.where(UserID: current_user.id).sum(:RedemptionID)
        @deff = RedemptionDetail.where(RedemptionID: @redemp).sum(:Points)
        @ans = @sum - @deff
    end

    def new
        @purchase = Purchase.new(purchase_params)
    end

    def purchase_params
        params.require(:purchase).permit(:PurchaseID,:PurchaseCodeID,:Points, :UserID)
    end



end

purchase.rb：

class Purchase < ActiveRecord::Base
     validates :PurchaseCodeID, presence: true,
                    length: { minimum: 5 }


    def self.create(purchase_params)

        begin
            @purchaseid = Purchase.last.id
            @purchaseid = @purchaseid + 1
        rescue
            @purchaseid = 1 
        end
        @code = PurchaseCode.find_by(Code: PurchaseCodeID).Code
        @purchase = Purchase.new(purchase_params)
        @purchase.PurchaseCodeID = @code
        @purchase.PurchaseID = @purchaseid
        @purchase.UserID = User.current.id
        @userTier = User.current.TierID
        @tierPoint = MembershipTier.find_by(TierID: @userTier).RequiredPoint
        @purchase.Points = @tierPoint
        @purchase.save


    end





end

view/purchases/index.html.erb：

<h1>Purchase History</h1>
<p>


  Enter the code here:</br>

<%= form_for :purchase, url: purchases_path do |f| %>

  <p>
    <%= f.text_field :PurchaseCodeID %>
  </p>

  <p>
    <%= f.submit %>
  </p>
<% end %>
<table>
  <thead>
    <tr>
      <th>Points</th>
      <th>Date</th>
      <th>Time</th>
      <th colspan="3"></th>
    </tr>

  </thead>

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

      <tr>
         <td><%= purchase.Points %></td>
         <td>|<%= purchase.created_at.to_s.to_date.strftime("%e %B, %Y") %></td>
         <td><%= purchase.created_at.to_s.to_time.strftime("| %I:%M %P") %></td>
      </tr>



  <% end %>

  </tbody>
</table>

  <tr>
  <td><p>Current Points: <%= @ans %></p></td>
  </tr>


<%= link_to t('sign_out'), destroy_user_session_path, method: :delete %>

我正在使用rails 4.希望有人能帮我解决问题。谢谢。

Answer 1

PurchaseCodeID似乎位于purchase_params，因此您应该更改此行：

@code = PurchaseCode.find_by(Code: PurchaseCodeID).Code

为：

@code = PurchaseCode.find_by(Code: purchase_params[:PurchaseCodeID]).Code