rails delete old record while creating new record












0














here is my condition: i have a model named Game and a model named GameLevel, their relationship is like code below:



class Game < ApplicationRecord

  has_many :game_level



class GameLevel < ApplicationRecord

  belongs_to :game


here is my situation:



when a Game has a GameLevel which name is default, it should not have low, medium, high;



when a Game has a GameLevel which names are low, medium, high, it should not have default.



so how do i delete default when i creating(or updating when record exists) low, medium, high , and how do i delete low ,medium, high when i creating(or updating when record exists) default in rails model?






ruby-on-rails model







share|improve this question






















  • if there is a solution what properly is, there are still some questions like are more "same levels" allowed and how do i handle this case if not.
    – devanand
    Nov 21 '18 at 9:43










  • @devanand my solution is that define a constant array in class GameLevel, if more "same levels" is required, add an element to the constant, because "default" level is against all other levels. Any better suggestions from you would be appreciate.
    – weird honey
    Nov 21 '18 at 9:47
















0














here is my condition: i have a model named Game and a model named GameLevel, their relationship is like code below:



class Game < ApplicationRecord

  has_many :game_level



class GameLevel < ApplicationRecord

  belongs_to :game


here is my situation:



when a Game has a GameLevel which name is default, it should not have low, medium, high;



when a Game has a GameLevel which names are low, medium, high, it should not have default.



so how do i delete default when i creating(or updating when record exists) low, medium, high , and how do i delete low ,medium, high when i creating(or updating when record exists) default in rails model?






ruby-on-rails model







share|improve this question






















  • if there is a solution what properly is, there are still some questions like are more "same levels" allowed and how do i handle this case if not.
    – devanand
    Nov 21 '18 at 9:43










  • @devanand my solution is that define a constant array in class GameLevel, if more "same levels" is required, add an element to the constant, because "default" level is against all other levels. Any better suggestions from you would be appreciate.
    – weird honey
    Nov 21 '18 at 9:47














0












0








0







here is my condition: i have a model named Game and a model named GameLevel, their relationship is like code below:



class Game < ApplicationRecord

  has_many :game_level



class GameLevel < ApplicationRecord

  belongs_to :game


here is my situation:



when a Game has a GameLevel which name is default, it should not have low, medium, high;



when a Game has a GameLevel which names are low, medium, high, it should not have default.



so how do i delete default when i creating(or updating when record exists) low, medium, high , and how do i delete low ,medium, high when i creating(or updating when record exists) default in rails model?






ruby-on-rails model







share|improve this question













here is my condition: i have a model named Game and a model named GameLevel, their relationship is like code below:



class Game < ApplicationRecord

  has_many :game_level



class GameLevel < ApplicationRecord

  belongs_to :game


here is my situation:



when a Game has a GameLevel which name is default, it should not have low, medium, high;



when a Game has a GameLevel which names are low, medium, high, it should not have default.



so how do i delete default when i creating(or updating when record exists) low, medium, high , and how do i delete low ,medium, high when i creating(or updating when record exists) default in rails model?






ruby-on-rails model




ruby-on-rails model






share|improve this question













share|improve this question











share|improve this question




share|improve this question










asked Nov 21 '18 at 8:25









weird honeyweird honey

17310




17310












  • if there is a solution what properly is, there are still some questions like are more "same levels" allowed and how do i handle this case if not.
    – devanand
    Nov 21 '18 at 9:43










  • @devanand my solution is that define a constant array in class GameLevel, if more "same levels" is required, add an element to the constant, because "default" level is against all other levels. Any better suggestions from you would be appreciate.
    – weird honey
    Nov 21 '18 at 9:47


















  • if there is a solution what properly is, there are still some questions like are more "same levels" allowed and how do i handle this case if not.
    – devanand
    Nov 21 '18 at 9:43










  • @devanand my solution is that define a constant array in class GameLevel, if more "same levels" is required, add an element to the constant, because "default" level is against all other levels. Any better suggestions from you would be appreciate.
    – weird honey
    Nov 21 '18 at 9:47
















if there is a solution what properly is, there are still some questions like are more "same levels" allowed and how do i handle this case if not.
– devanand
Nov 21 '18 at 9:43




if there is a solution what properly is, there are still some questions like are more "same levels" allowed and how do i handle this case if not.
– devanand
Nov 21 '18 at 9:43












@devanand my solution is that define a constant array in class GameLevel, if more "same levels" is required, add an element to the constant, because "default" level is against all other levels. Any better suggestions from you would be appreciate.
– weird honey
Nov 21 '18 at 9:47




@devanand my solution is that define a constant array in class GameLevel, if more "same levels" is required, add an element to the constant, because "default" level is against all other levels. Any better suggestions from you would be appreciate.
– weird honey
Nov 21 '18 at 9:47












2 Answers
2






active

oldest

votes


















1














You can use before_save callback mentioned here
And you should use game_levels instead of game_level as convention.



As an example you can write something like this;



class GameLevel < ApplicationRecord #or ActiveRecord::Base

  belongs_to :game

  before_save :remove_unnecessary



  private

    def remove_unnecessary

      if self.name == "default"

        self.game.game_levels.where(name: ["low", "medium", "high"]).destroy_all()

      end

      if ["low", "medium", "high"].any?{ |type| self.name == type }

        self.game.game_levels.where(name: "default").destroy_all()

      end

    end

end


for destroy you can look to here






share|improve this answer



















  • 1




    great answer! I used your method and problem solved perfectly! ps: destroy requires 1 argument id, so I use destroy_all instead.
    – weird honey
    Nov 21 '18 at 9:39





















1














You can use below code



class GmaeLevel < ApplicationRecord

    belongs_to :game

    before_save :update_date

    private

       def update_date

           self.name == "default" ? self.game.game_levels.(name: ["low","medium","high"]).destroy_all : self.game.game_levels.where(name: "default").destroy

       end

end





share|improve this answer





















  • thanks for ur solution, it works as good as the above one and looks more succinct.
    – weird honey
    Nov 21 '18 at 10:03










  • All the best :)
    – user3678149
    Nov 21 '18 at 10:12











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2 Answers
2






active

oldest

votes








2 Answers
2






active

oldest

votes









active

oldest

votes






active

oldest

votes









1














You can use before_save callback mentioned here
And you should use game_levels instead of game_level as convention.



As an example you can write something like this;



class GameLevel < ApplicationRecord #or ActiveRecord::Base

  belongs_to :game

  before_save :remove_unnecessary



  private

    def remove_unnecessary

      if self.name == "default"

        self.game.game_levels.where(name: ["low", "medium", "high"]).destroy_all()

      end

      if ["low", "medium", "high"].any?{ |type| self.name == type }

        self.game.game_levels.where(name: "default").destroy_all()

      end

    end

end


for destroy you can look to here






share|improve this answer



















  • 1




    great answer! I used your method and problem solved perfectly! ps: destroy requires 1 argument id, so I use destroy_all instead.
    – weird honey
    Nov 21 '18 at 9:39


















1














You can use before_save callback mentioned here
And you should use game_levels instead of game_level as convention.



As an example you can write something like this;



class GameLevel < ApplicationRecord #or ActiveRecord::Base

  belongs_to :game

  before_save :remove_unnecessary



  private

    def remove_unnecessary

      if self.name == "default"

        self.game.game_levels.where(name: ["low", "medium", "high"]).destroy_all()

      end

      if ["low", "medium", "high"].any?{ |type| self.name == type }

        self.game.game_levels.where(name: "default").destroy_all()

      end

    end

end


for destroy you can look to here






share|improve this answer



















  • 1




    great answer! I used your method and problem solved perfectly! ps: destroy requires 1 argument id, so I use destroy_all instead.
    – weird honey
    Nov 21 '18 at 9:39
















1












1








1






You can use before_save callback mentioned here
And you should use game_levels instead of game_level as convention.



As an example you can write something like this;



class GameLevel < ApplicationRecord #or ActiveRecord::Base

  belongs_to :game

  before_save :remove_unnecessary



  private

    def remove_unnecessary

      if self.name == "default"

        self.game.game_levels.where(name: ["low", "medium", "high"]).destroy_all()

      end

      if ["low", "medium", "high"].any?{ |type| self.name == type }

        self.game.game_levels.where(name: "default").destroy_all()

      end

    end

end


for destroy you can look to here






share|improve this answer














You can use before_save callback mentioned here
And you should use game_levels instead of game_level as convention.



As an example you can write something like this;



class GameLevel < ApplicationRecord #or ActiveRecord::Base

  belongs_to :game

  before_save :remove_unnecessary



  private

    def remove_unnecessary

      if self.name == "default"

        self.game.game_levels.where(name: ["low", "medium", "high"]).destroy_all()

      end

      if ["low", "medium", "high"].any?{ |type| self.name == type }

        self.game.game_levels.where(name: "default").destroy_all()

      end

    end

end


for destroy you can look to here







share|improve this answer














share|improve this answer



share|improve this answer








edited Nov 21 '18 at 10:29

























answered Nov 21 '18 at 8:56









Onur Eren ElibolOnur Eren Elibol

1711110




1711110








  • 1




    great answer! I used your method and problem solved perfectly! ps: destroy requires 1 argument id, so I use destroy_all instead.
    – weird honey
    Nov 21 '18 at 9:39
















  • 1




    great answer! I used your method and problem solved perfectly! ps: destroy requires 1 argument id, so I use destroy_all instead.
    – weird honey
    Nov 21 '18 at 9:39










1




1




great answer! I used your method and problem solved perfectly! ps: destroy requires 1 argument id, so I use destroy_all instead.
– weird honey
Nov 21 '18 at 9:39






great answer! I used your method and problem solved perfectly! ps: destroy requires 1 argument id, so I use destroy_all instead.
– weird honey
Nov 21 '18 at 9:39















1














You can use below code



class GmaeLevel < ApplicationRecord

    belongs_to :game

    before_save :update_date

    private

       def update_date

           self.name == "default" ? self.game.game_levels.(name: ["low","medium","high"]).destroy_all : self.game.game_levels.where(name: "default").destroy

       end

end





share|improve this answer





















  • thanks for ur solution, it works as good as the above one and looks more succinct.
    – weird honey
    Nov 21 '18 at 10:03










  • All the best :)
    – user3678149
    Nov 21 '18 at 10:12
















1














You can use below code



class GmaeLevel < ApplicationRecord

    belongs_to :game

    before_save :update_date

    private

       def update_date

           self.name == "default" ? self.game.game_levels.(name: ["low","medium","high"]).destroy_all : self.game.game_levels.where(name: "default").destroy

       end

end





share|improve this answer





















  • thanks for ur solution, it works as good as the above one and looks more succinct.
    – weird honey
    Nov 21 '18 at 10:03










  • All the best :)
    – user3678149
    Nov 21 '18 at 10:12














1












1








1






You can use below code



class GmaeLevel < ApplicationRecord

    belongs_to :game

    before_save :update_date

    private

       def update_date

           self.name == "default" ? self.game.game_levels.(name: ["low","medium","high"]).destroy_all : self.game.game_levels.where(name: "default").destroy

       end

end





share|improve this answer












You can use below code



class GmaeLevel < ApplicationRecord

    belongs_to :game

    before_save :update_date

    private

       def update_date

           self.name == "default" ? self.game.game_levels.(name: ["low","medium","high"]).destroy_all : self.game.game_levels.where(name: "default").destroy

       end

end






share|improve this answer












share|improve this answer



share|improve this answer










answered Nov 21 '18 at 9:53









user3678149user3678149

1676




1676












  • thanks for ur solution, it works as good as the above one and looks more succinct.
    – weird honey
    Nov 21 '18 at 10:03










  • All the best :)
    – user3678149
    Nov 21 '18 at 10:12


















  • thanks for ur solution, it works as good as the above one and looks more succinct.
    – weird honey
    Nov 21 '18 at 10:03










  • All the best :)
    – user3678149
    Nov 21 '18 at 10:12
















thanks for ur solution, it works as good as the above one and looks more succinct.
– weird honey
Nov 21 '18 at 10:03




thanks for ur solution, it works as good as the above one and looks more succinct.
– weird honey
Nov 21 '18 at 10:03












All the best :)
– user3678149
Nov 21 '18 at 10:12




All the best :)
– user3678149
Nov 21 '18 at 10:12


















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