添加自類模型軌道3

我有3種型號：添加自類模型軌道3

Class Model1 

end 

Class Model2 

end 

Class Model3 

end

我有這樣的代碼：

scope :created_between, lambda { |start_time, end_time| where(:created_at => (start_time...end_time)) } 

class << self 
## Class methods for calculating searches 
def created_today 
    today = Time.zone.now 
    created_between(today.beginning_of_day, today.end_of_day) 
end 

def created_yesterday 
    yesterday = Time.zone.now - 1.day 
    created_between(yesterday.beginning_of_day, yesterday.end_of_day) 
end 

def created_last_week 
    start_time = (Time.zone.now - 1.week).beginning_of_day 
    end_time = Time.zone.now 
    created_between(start_time, end_time) 
end 

def created_last_month 
    start_time = (Time.zone.now - 1.month).beginning_of_day 
    end_time = Time.zone.now 
    created_between(start_time, end_time) 
end 

def created_last_year 
    start_time = (Time.zone.now - 1.year).beginning_of_day 
    end_time = Time.zone.now 
    created_between(start_time, end_time) 
end

末

我需要這個代碼添加到3款，但我不不想在每個模型中重複代碼。

我該怎麼辦？

非常感謝！

來源

2012-11-08 hyperrjas

我不會爲第一種方法使用範圍。你可以用另一個帶有兩個參數的類方法來實現，然後你不需要lamba。 –

謝謝，你能添加一個例子嗎？ – hyperrjas

只要完成你對其他方法的操作，但是該方法需要兩個參數。 –

試試這個：

module CommonClassFunctions 

def self.included(base) 
    base.send :extend, ClassMethods 
end 

module ClassMethods 
    ## Class methods for calculating searches 
    def created_today 
    today = Time.zone.now 
    created_between(today.beginning_of_day, today.end_of_day) 
    end 

    def created_yesterday 
    yesterday = Time.zone.now - 1.day 
    created_between(yesterday.beginning_of_day, yesterday.end_of_day) 
    end 

    def created_last_week 
    start_time = (Time.zone.now - 1.week).beginning_of_day 
    end_time = Time.zone.now 
    created_between(start_time, end_time) 
    end 

    def created_last_month 
    start_time = (Time.zone.now - 1.month).beginning_of_day 
    end_time = Time.zone.now 
    created_between(start_time, end_time) 
    end 

    def created_last_year 
    start_time = (Time.zone.now - 1.year).beginning_of_day 
    end_time = Time.zone.now 
    created_between(start_time, end_time) 
    end 
    end 
end 

Class Model1 
    include CommonClassFunctions 
end 

Class Model2 
    include CommonClassFunctions 
end 

Class Model3 
    include CommonClassFunctions 
end

來源

2012-11-08 15:04:01 AnandVeeramani

非常感謝你完成這個例子。 – hyperrjas

好的答案:)，爲什麼不是'AS :: Concern'？它更簡單，並提供更多的功能。我可以編輯使用「ActiveSupport :: Concern」的答案嗎？ – rewritten

您可以使用此方法定義模塊，然後將其包含在3個模型中。

像：

module Searcheable 
    def created_today 
    . 
    . 
    . 
    . 
    . 
    end 
end

然後在類：

class Model1 
    extend Searcheable 
end 

class Model2 
    extend Searcheable 
end 

class Model3 
    extend Searcheable 
end

來源

2012-11-08 15:00:51

謝謝你在我的rails項目的文件夾中創建文件的模塊？ – hyperrjas

該模塊可以放在lib文件夾中。 –

好（可能更好）答案 - 組成通常比繼承更好！儘管它仍然依賴於用例... – awenkhh

你可以繼承做到這一點

class Model 
    class << self 
    def created_today 
     puts "created today from Model" 
    end 
    end 
end 

class Model1 < Model 

end 

class Model2 < Model 

end 

class Model3 < Model 

end 

Model1.created_today 
# output: created today from Model

來源

2012-11-08 15:03:32 awenkhh

添加自類模型軌道3

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