Question

我有两个模型，一个是customer.rb，第二个是money.rb。关系是客户has_many：钱而钱属于客户。我正在使用MySql远程数据库。当我尝试一次从单个表中提取数据时它工作正常，但问题是当我尝试这样做时：

<%= @customer.money.each do |m| %>
  <%= m.id %>
  <%= m.cid %>
<% end %>

它抛出一个错误：Mysql :: Error：'where子句'中的未知列'money_tb.customer_id'：SELECT money_tb。* FROM money_tb WHERE money_tb。{{1 }} =？这是我的show.html.erb的片段：

customer_id

这是我的customers_controller：

<h1><%= @customer.name %></h1>
<%= @customer.money.each do |m|  %>
  <%= @m.id %>
  <%= @m.cid %>
  <%= @m.customer.name %>
<% end %>

这是模特：

class CustomersController < ApplicationController
    def index
        @customers = Customer.all
    end

    def new
        @customer = Customer.new


    end
    def create
        @customer = Customer.new(customer_params)
        if @customer.save
            flash[:notice] = "Customer Create"
            redirect_to new_customer_path
        else
            render 'new'
        end

    end

    def edit
        @customer = Customer.find(params[:id])

    end
    def update
        @customer = Customer.find(params[:id])
        if @customer.update(customer_params)
            flash[:notice] = "Customer Updated"
            redirect_to customers_path
        else
            render 'edit'
        end
    end
    def show
        @customer = Customer.find(params[:id])
    end
    private
    def customer_params
        params.require(:customer).permit(:name, :address, :ph_no)
    end



end

另外我想提一下money表中的customer_id字段表示为“cid”

Answer 1

如果你有不同的foreign_key名称而不是＆＃34; association_name_id＆＃34;然后，您需要将:foreign_key选项传递给belongs_to和has_many。

class Customer < ActiveRecord::Base
  has_many :money, foreign_key: "cid"
end

class Money < ActiveRecord::Base
  belongs_to :customer, foreign_key: "cid"
end

客户#show中的Ruby on Rails ActiveRecord :: StatementInvalid

1 个答案: