使用ActiveRecord :: Validator類時無法比較日期

我有這個限制的問題！我不能比較兩個日期和控制檯給我這個錯誤：使用ActiveRecord :: Validator類時無法比較日期

undefined method `<' for nil:NilClass

這是我到目前爲止寫的代碼。

# app/models/reservation.rb 

class CountValidator < ActiveModel::Validator 
    def validate(record) 
    if (record.second || record.first) 
     record.errors[:base]<< ' error ' 
    end 
    end 
end 

class DepartureValidator < ActiveModel::Validator 
    def validate(record) 
    if (record.date_trip < Date.today) 
     record.errors[:base]<< ' error ' 
    end 
    end 
end 

class Reservation < ActiveRecord::Base 
    validates_with DepartureValidator 
    validates_with CountValidator 
    belongs_to :dep ,:class_name => 'Stop', :foreign_key => 'dep_id' 
    belongs_to :arr ,:class_name => 'Stop',:foreign_key => 'arr_id' 
    belongs_to :route 
    belongs_to :user 
    delegate :CountStop, :to => :route, prefix: true, :allow_nil => false 
    delegate :city ,:to => :arr, :allow_nil => false 
    delegate :city ,:to => :dep, :allow_nil => false 

    def division 
    return Reservation.select{|r| r.route_id == route_id && r.date_trip == date_trip && r.id != id } 
    end 

    def second 
    if (class_point == 2) 
     y=division.select{ |l| l.class_point == 2 }.count 
     if(y+1 > route.train.II_class_seats) 
     return true 
     end 
    end 
    return false 
    end 

    def first 
    if (class_point == 1) 
     y=division.select{ |l| l.class_point == 1 }.count 
     if(y+1 > route.train.I_class_seats) 
     return true 
     end 
    end 
    return false 
    end 
end

我不明白問題在哪裏。我的一位朋友寫了相同的代碼，但它對他完全起作用。

編輯：

這是完全錯誤的消息：正在與DepartureValidator驗證沒有一個「date_trip」屬性（如圖日誌文件中）

Started POST "/reservations" for 127.0.0.1 at 2015-09-02 15:04:13 +0200 
Processing by ReservationsController#create as HTML 
    Parameters: {"utf8"=>"✓", "authenticity_token"=>"PzfuWIWXqb6C3cCiI+fLendTadwR/kG/++3q6TRcgxLAUGyD1eFluBZB2SZZB3f0ZH6QiRyoj6py+3a6gfOg8A==", "reservation"=>{"class_point"=>"1", "route_id"=>"2", "dep_id"=>"4", "arr_id"=>"4"}, "commit"=>"Create reservation!"} 
    User Load (0.1ms) SELECT "users".* FROM "users" WHERE "users"."id" = ? LIMIT 1 [["id", 1]] 
    (0.2ms) begin transaction 
    (0.1ms) rollback transaction 
Completed 500 Internal Server Error in 3ms (ActiveRecord: 0.4ms) 

NoMethodError (undefined method `<' for nil:NilClass): 
    app/models/reservation.rb:12:in `validate' 
    app/controllers/reservations_controller.rb:33:in `block in create' 
    app/controllers/reservations_controller.rb:32:in `create' 


    Rendered /home/railsuser/.rvm/gems/ruby-2.2.2/gems/actionpack-4.2.1/lib/action_dispatch/middleware/templates/rescues/_source.erb (5.8ms) 
    Rendered /home/railsuser/.rvm/gems/ruby-2.2.2/gems/actionpack-4.2.1/lib/action_dispatch/middleware/templates/rescues/_trace.html.erb (3.8ms) 
    Rendered /home/railsuser/.rvm/gems/ruby-2.2.2/gems/actionpack-4.2.1/lib/action_dispatch/middleware/templates/rescues/_request_and_response.html.erb (1.1ms) 
    Rendered /home/railsuser/.rvm/gems/ruby-2.2.2/gems/actionpack-4.2.1/lib/action_dispatch/middleware/templates/rescues/diagnostics.html.erb within rescues/layout (24.9ms) 
    Rendered /home/railsuser/.rvm/gems/ruby-2.2.2/gems/web-console-2.2.1/lib/web_console/templates/_markup.html.erb (0.8ms) 
    Rendered /home/railsuser/.rvm/gems/ruby-2.2.2/gems/web-console-2.2.1/lib/web_console/templates/_inner_console_markup.html.erb within layouts/inlined_string (0.4ms) 
    Rendered /home/railsuser/.rvm/gems/ruby-2.2.2/gems/web-console-2.2.1/lib/web_console/templates/_prompt_box_markup.html.erb within layouts/inlined_string (0.5ms) 
    Rendered /home/railsuser/.rvm/gems/ruby-2.2.2/gems/web-console-2.2.1/lib/web_console/templates/style.css.erb within layouts/inlined_string (0.6ms) 
    Rendered /home/railsuser/.rvm/gems/ruby-2.2.2/gems/web-console-2.2.1/lib/web_console/templates/console.js.erb within layouts/javascript (16.8ms) 
    Rendered /home/railsuser/.rvm/gems/ruby-2.2.2/gems/web-console-2.2.1/lib/web_console/templates/main.js.erb within layouts/javascript (0.4ms) 
    Rendered /home/railsuser/.rvm/gems/ruby-2.2.2/gems/web-console-2.2.1/lib/web_console/templates/error_page.js.erb within layouts/javascript (0.6ms) 
    Rendered /home/railsuser/.rvm/gems/ruby-2.2.2/gems/web-console-2.2.1/lib/web_console/templates/index.html.erb (36.2ms)

來源

2015-09-02 Pino

請問您的朋友有_exactly_相同的代碼？當你運行'diff '時會發生什麼？你的朋友是否使用相同版本的Ruby和Rails？請發佈_full_錯誤消息，包括一行代碼。 **在問題中發佈錯誤，而不是評論** – onebree

另外，它看起來像你來自JavaScript等背景。當你做這些陳述時，你不需要把這個陳述包含在parens中。它們最好用於方法參數或更好地定義操作順序。 – onebree

好吧我發佈了完整的錯誤信息 – Pino

您的預訂記錄。與validates_with DepartureValidator, if: "date_trip.present?"

更改替換validates_with DepartureValidator您的驗證程序：

class DepartureValidator < ActiveModel::Validator 
    def validate(record) 
    if (record.date_trip && record.date_trip < Date.today) 
     record.errors[:base]<< ' error ' 
    end 
    end 
end

來源

2015-09-02 15:46:28

使用ActiveRecord :: Validator類時無法比較日期

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