如果票证存在ruby,如何检查数据库?

时间:2015-10-26 08:31:28

标签: ruby-on-rails ruby

我正在使用ruby中的餐馆系统,目前正在按照现在设置的方式设置故障单控制器,每次用户点击添加到故障单时,它每次都会创建一个新故障单。我想要它,所以当用户单击添加到票证时,它会检查数据库中是否存在票证,如果不存在,则会创建一个新票证,如果存在,则会添加到同一票证。我不太确定如何处理它。

class TicketController < ApplicationController


  def addToTicket
    session[:tableID] = "15"
    unless defined? check
        check = Ticket.create(
        table: session[:tableID],
        tax: "8.25",
        tstatus: 0
        )   
        session[:ticket] = check
        puts("**********Ticket created************")
        redirect_to guest_path
    else
        check.orderItems.create(
            item: (MenuItem.find_by id: params[:item_id]),
            ingredients: params[:good_ingredients],
            notes: params[:notes],
            istatus: 0
        )
        session[:ticket] = check
        puts("**************Ticket added to***********")
        redirect_to guest_path
    end
end

1 个答案:

答案 0 :(得分:0)

您在模型中使用validations执行此操作:

#app/models/user.rb
class User < ActiveRecord::Base
   has_many :tickets
end

#app/models/ticket.rb
class Ticket < ActiveRecord::Base
   belongs_to :user
   belongs_to :table
   validates :table, uniqueness: { scope: :user } # You didn't provide much context so this is quite generic
end

#app/models/table.rb
class Table < ActiveRecord::Base
   has_many :tickets
   has_many :users, through: :tickets
end

这允许您使用以下内容:

#config/routes.rb
resources :tables do
   resources :tickets
end

#app/controllers/tickets_controller.rb
class TicketsController < ApplicationController
   def new
     @table  = Table.find params[:table_id]
     @ticket = current_user.tickets.new(table: @table)
   end

   def create
     @table = Table.find params[:table_id]
     @ticket = current_user.tickets.new ticket_params
     @ticket.save
   end

   private

   def ticket_params
     params.require(:ticket).permit(:tax, :tstatus, :table_id).merge(table_id: @table.id)
   end
end

注释

在控制器中输出(puts)并不是一个好主意...除非你喜欢检查你的日志。

认为您正在尝试调用flash方法:

def create
   flash[:success] = "Ticket Created"
end

-

您还需要确保从您的观看中调用正确的操作 ...

您目前正在使用addToticket(应该在snake_case中) - 相当于update。我建议您独立使用new/createupdate操作,而不是您拥有的内容:

#app/controllers/tables_controller.rb
class TablesController < ApplicationController
   def show
      @table  = Table.find params[:id]
      @ticket = current_user.tickets.find_by(table_id: params[:id]) || current_user.tickets.new(table: @table)
   end
end

#app/controllers/tickets_controller.rb
class TicketsController < ApplicationController
   def create
      @table = Table.find params[:id]
      @ticket = current_user.tickets.new ticket_params
      redirect_to @table if @ticket.save
   end

   def update
      @table = Table.find params[:id]
      @ticket = current_user.tickets.new ticket_params
      ## more logic here
      redirect_to @table if @ticket.save        
   end

   private

   def ticket_params
      params.require(:ticket).permit(:tstatus, :etc, :etc).merge(table_id: @table.id)
   end
end

#app/views/tables/show.html.erb
<%= form_for [@table, @ticket] do |f| %>
    <%= f.text_field :tstatus %>
    ....
    <%= f.submit %>
<% end %>

上面将调用一个表单,并根据Table模型用适当的字段填充它。 真的很酷的事情是,如果你设置它,如果没有票证,一个&#34;新&#34;将调用模型的实例,将提交内容发送到create操作,否则update

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