![if || unless
if !params[:query].blank?
if !something unless something](https://image.slidesharecdn.com/worriedcode-110604074412-phpapp02/85/Worried-code-7-320.jpg)
![§¢§à§ñ§Ù§ß§î §á§à§Ý§î§Ù§à§Ó§Ñ§ä§Ö§Ý§ñ
§¬§à§Õ §Ú§Ù §Ü§à§ß§ä§â§à§Ý§Ý§Ö§â§Ñ §Ó §Ñ§Õ§Þ§Ú§ß§Ü§Ö
@role = Role.find params[:id]
redirect_to role_index_path and return unless @role
§±§â§à§Ô§â§Ñ§Þ§Þ§Ú§ã§ä §Ò§à§Ú§ä§ã§ñ §ß§Ö§á§â§Ñ§Ó§Ú§Ý§î§ß§à§Ô§à §á§Ñ§â§Ñ§Þ§Ö§ä§â§Ñ.
§±§â§Ú §ï§ä§à§Þ §à§ß §Ù§Ñ§Ò§í§Ó§Ñ§Ö§ä §à §ä§à§Þ, §é§ä§à ?nd §Ó§í§Ò§â§Ñ§ã§í§Ó§Ñ§Ö§ä
exception.](https://image.slidesharecdn.com/worriedcode-110604074412-phpapp02/85/Worried-code-11-320.jpg)
![§¢§à§ñ§Ù§ß§î §á§â§Ö§Õ§Ö§Ý§î§ß§í§ç
§å§ã§Ý§à§Ó§Ú§Û
session[:foo] = params[:foo].blank? ? nil :
params[:foo].to_i
VS.
session[:foo] = params[:foo] ? params[:foo] : nil](https://image.slidesharecdn.com/worriedcode-110604074412-phpapp02/85/Worried-code-12-320.jpg)
![§¢§à§ñ§Ù§ß§î §ñ§Ù§í§Ü§Ñ
scope :with_state, lambda {|state| where('state = ?',
state.to_s)}
scope :ready_for_start, with_state(:foo)
scope :ready_for_close, where('state IN(?)',
[:foo, :bar])
¡°§¡ §Ó§Õ§â§å§Ô §à§ß §ß§Ö §á§â§Ú§Ó§Ö§Õ§Ö§ä §ã§Ú§Þ§Ó§à§Ý §Ü §ã§ä§â§à§Ü§Ö?¡±
scope :with_states, lambda {|s| where("state in
(#{s.map{|e| "'#{e.to_s}'"}.join(',')})")}](https://image.slidesharecdn.com/worriedcode-110604074412-phpapp02/85/Worried-code-13-320.jpg)
![§ª§Ý§Ý§ð§Ù§Ú§ñ §Ü§à§ß§ä§â§à§Ý§ñ
def self.find_for_facebook_oauth(access_token,
signed_in_resource=nil)
data = access_token['extra']['user_hash']
if user = User.find_by_email(data["email"])
user
else # Create a user with a stub password.
user = User.create do |record|
record.email = data['email']
record.password = Devise.friendly_token[0,20]
record.registration_source = 1
record.skip_confirmation!
end
end
end](https://image.slidesharecdn.com/worriedcode-110604074412-phpapp02/85/Worried-code-14-320.jpg)
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- 1. §¢§Ö§ã§á§à§Ü§à§Û§ß§í§Û §Ü§à§Õ @SergeyMoiseev
- 2. §° §ã§Ö§Ò§Ö ? §¥§Ö§Ó§Ö§Ý§à§á§Ö§â §ã 1998 §Ô§à§Õ§Ñ. ? §±§Ú§ã§Ñ§Ý §Ú§ß§Õ§å§ã§ä§â§Ú§Ñ§Ý§î§ß§í§Ö §ã§Ú§ã§ä§Ö§Þ§í §ß§Ñ PHP. ? §´§Ö§á§Ö§â§î §ß§Ñ RoR.
- 3. §¬§Ñ§Ü §à§á§â§Ö§Õ§Ö§Ý§Ú§ä§î §ß§Ö§à§æ§Ú§ä§Ñ? ? §´§à§Ý§ã§ä§í§Ö §Ü§à§ß§ä§â§à§Ý§Ý§Ö§â§í ? §¢§Ö§ã§á§à§Ü§à§Û§ã§ä§Ó§à ? §¨§Ö§Ý§Ñ§ß§Ú§Ö ¡°§â§Ñ§Ò§à§ä§Ñ§ä§î¡± §ã §á§â§Ö§Õ§Ö§Ý§î§ß§í§Þ§Ú §å§ã§Ý§à§Ó§Ú§ñ§Þ§Ú
- 4. §³§Ñ§Þ§í§Û §á§â§à§ã§ä§à§Û §ã§á§à§ã§à§Ò? def foobar x = self.bar x = nil if x == 0 y = foo return x || y end
- 5. Return ? §³§Ñ§Þ§í§Û §ß§Ö§à§é§Ö§Ó§Ú§Õ§ß§í§Û §à§á§Ö§â§Ñ§ä§à§â §Õ§Ý§ñ §ß§à§Ó§Ú§é§Ü§à§Ó ? §¶§å§ß§Ü§è§Ú§ñ §Ö§Ô§à §ß§Ñ§Ú§Ò§à§Ý§Ö§Ö §à§ä§Ý§Ú§é§Ñ§Ö§ä§ã§ñ §à§ä §ä§Ñ§Ü§à§Ó§à§Û §Ó §Õ§â§å§Ô§Ú§ç §ñ§Ù§í§Ü§Ñ§ç
- 6. return §Õ§Ý§ñ ?ow-control def foobar if foo? if bar? #do something return 42 else #do something end else #do something end end
- 7. if || unless if !params[:query].blank? if !something unless something
- 8. unless? ? §¬§Ñ§Ü §ß§Ú §ã§ä§â§Ñ§ß§ß§à, §ï§ä§à §Ö§Õ§Ú§ß§ã§ä§Ó§Ö§ß§ß§à§Ö §Õ§Ý§ñ §é§Ö§Ô§à §à§ß §ß§å§Ø§Ö§ß. ? §¹§Ú§ä§Ñ§ä§î §Ý§à§Ô§Ú§Ü§å §à§Ò§ì§Ö§Õ§Ú§ß§Ö§ß§ß§å§ð and/or §á§â§Ú §ï§ä§à§Þ §á§â§Ú§Þ§Ö§ß§ñ§ñ §Ü §ß§Ö§Û ! §ã§Ý§à§Ø§ß§à. ? §µ §ß§Ö§Ô§à §ß§Ö§ä elsunless (§ß§Ö§Ý§î§Ù§ñ §ã§Ü§Ñ§Ù§Ñ§ä§î, §é§ä§à §ï§ä§à §Þ§Ú§ß§å§ã).
- 9. If/else vs. unless def possible_parents if self.new_record? Category.first_level else Category.first_level.where('id != ?', self.id) end end vs. scope :not_given, lambda{|id| where('id != ?', id)} def possible_parents Category.first_level Category.first_level.not_given(self.id) unless self.new_record? end
- 10. §£§Ú§Õ§í §Ò§Ö§ã§á§à§Ü§à§Û§ã§ä§Ó§Ñ ? §¢§à§ñ§Ù§ß§î §á§à§Ý§î§Ù§à§Ó§Ñ§ä§Ö§Ý§ñ (§Ô§Ý§å§á§à§Ô§à §Ú§Ý§Ú §Ù§Ý§à§ß§Ñ§Þ§Ö§â§ñ§ß§ß§à§Ô§à). ? §¢§à§ñ§Ù§ß§î §á§â§Ö§Õ§Ö§Ý§î§ß§í§ç §å§ã§Ý§à§Ó§Ú§Û. ? §¢§à§ñ§Ù§ß§î §ñ§Ù§í§Ü§Ñ. §¯§Ö§Õ§à§ã§ä§Ñ§ä§à§Ü §Ó§â§Ö§Þ§Ö§ß§Ú §Õ§Ý§ñ §ï§Ü§ã§á§Ö§â§Ú§Þ§Ö§ß§ä§à§Ó. ? §ª§Ý§Ý§ð§Ù§Ú§ñ §Ü§à§ß§ä§â§à§Ý§ñ.
- 11. §¢§à§ñ§Ù§ß§î §á§à§Ý§î§Ù§à§Ó§Ñ§ä§Ö§Ý§ñ §¬§à§Õ §Ú§Ù §Ü§à§ß§ä§â§à§Ý§Ý§Ö§â§Ñ §Ó §Ñ§Õ§Þ§Ú§ß§Ü§Ö @role = Role.find params[:id] redirect_to role_index_path and return unless @role §±§â§à§Ô§â§Ñ§Þ§Þ§Ú§ã§ä §Ò§à§Ú§ä§ã§ñ §ß§Ö§á§â§Ñ§Ó§Ú§Ý§î§ß§à§Ô§à §á§Ñ§â§Ñ§Þ§Ö§ä§â§Ñ. §±§â§Ú §ï§ä§à§Þ §à§ß §Ù§Ñ§Ò§í§Ó§Ñ§Ö§ä §à §ä§à§Þ, §é§ä§à ?nd §Ó§í§Ò§â§Ñ§ã§í§Ó§Ñ§Ö§ä exception.
- 12. §¢§à§ñ§Ù§ß§î §á§â§Ö§Õ§Ö§Ý§î§ß§í§ç §å§ã§Ý§à§Ó§Ú§Û session[:foo] = params[:foo].blank? ? nil : params[:foo].to_i VS. session[:foo] = params[:foo] ? params[:foo] : nil
- 13. §¢§à§ñ§Ù§ß§î §ñ§Ù§í§Ü§Ñ scope :with_state, lambda {|state| where('state = ?', state.to_s)} scope :ready_for_start, with_state(:foo) scope :ready_for_close, where('state IN(?)', [:foo, :bar]) ¡°§¡ §Ó§Õ§â§å§Ô §à§ß §ß§Ö §á§â§Ú§Ó§Ö§Õ§Ö§ä §ã§Ú§Þ§Ó§à§Ý §Ü §ã§ä§â§à§Ü§Ö?¡± scope :with_states, lambda {|s| where("state in (#{s.map{|e| "'#{e.to_s}'"}.join(',')})")}
- 14. §ª§Ý§Ý§ð§Ù§Ú§ñ §Ü§à§ß§ä§â§à§Ý§ñ def self.find_for_facebook_oauth(access_token, signed_in_resource=nil) data = access_token['extra']['user_hash'] if user = User.find_by_email(data["email"]) user else # Create a user with a stub password. user = User.create do |record| record.email = data['email'] record.password = Devise.friendly_token[0,20] record.registration_source = 1 record.skip_confirmation! end end end
- 15. §°§ã§Ý§Ö§á§Ý§Ö§ß§Ú§Ö §Ò§Ö§ã§á§à§Ü§à§Û§ã§ä§Ó§à§Þ def self.to_rtf(codes) buffer = "" codes.each {|code| buffer << code.value << "n"} buffer end
- 16. §°§ã§Ý§Ö§á§Ý§Ö§ß§Ú§Ö §Ò§Ö§ã§á§à§Ü§à§Û§ã§ä§Ó§à§Þ 2 def self.to_rtf(codes) codes.inject("") {|code, buffer| buffer << code.value << "n"} end §¿§ä§à §Ò§í§Ý §â§Ö§æ§Ñ§Ü§ä§à§â§Ú§ß§Ô
- 17. §°§ã§Ý§Ö§á§Ý§Ö§ß§Ú§Ö §Ò§Ö§ã§á§à§Ü§à§Û§ã§ä§Ó§à§Þ 3 def self.to_rtf(codes) codes.map(&:value).join("n") end §¡ §ï§ä§à §ä§à, §é§ä§à §ß§Ñ §ã§Ñ§Þ§à§Þ §Õ§Ö§Ý§Ö §Ò§í§Ý§à §ß§å§Ø§ß§à.
- 18. §©§ß§Ñ§Û §ã§Ó§à§Ú §Ú§ß§ã§ä§â§å§Þ§Ö§ß§ä§í before_filter :guests_only! def guests_only! redirect_to root_url and return if user_signed_in? end §©§Ñ§é§Ö§Þ §ä§å§ä return?
- 19. §²§Ñ§Ù§Ô§Ñ§Õ§Ü§Ñ ? §±§â§à§Ô§â§Ñ§Þ§Þ§Ú§ã§ä §ß§Ö §Ù§ß§Ñ§Ö§ä, §Ü§Ñ§Ü §â§Ñ§Ò§à§ä§Ñ§Ö§ä before_?lter. ? §°§ß §Ò§Ö§ã§á§à§Ü§à§Ú§ä§ã§ñ, §é§ä§à §Ü§à§Õ §Ü§à§ß§ä§â§à§Ý§Ý§Ö§â§Ñ §Ò§å§Õ§Ö§ä §Ó§í§á§à§Ý§ß§ñ§ä§î§ã§ñ §á§à§ã§Ý§Ö §â§Ö§Õ§Ú§â§Ö§Ü§ä§Ñ §Ó §æ§Ú§Ý§î§ä§â§Ö. ? §°§ä §ã§Ó§à§Ö§Ô§à §Ò§Ö§ã§á§à§Ü§à§Û§ã§ä§Ó§Ñ §à§ß §Ù§Ñ§Ò§í§Ó§Ñ§Ö§ä §Ü§Ñ§Ü §à §ä§à§Þ, §é§ä§à §ß§å§Ø§ß§à §Ó§à§Ù§Ó§â§Ñ§ë§Ñ§ä§î false, §ä§Ñ§Ü §Ú §à §ä§à§Þ, §é§ä§à §á§à§ã§Ý§Ö §â§Ö§Õ§Ú§â§Ö§Ü§ä§Ñ §ï§ä§à §å§Ø§Ö §Ý§Ú§ê§ß§Ö§Ö.
- 20. §¢§à§Ý§Ö§Ö §á§â§à§ã§ä§à§Ö §à§Ò§ì§ñ§ã§ß§Ö§ß§Ú§Ö ? §¬§à§Õ §Ò§í§Ý §á§Ö§â§Ö§ß§Ö§ã§Ö§ß §Ó §æ§Ú§Ý§î§ä§â §Ú§Ù §ï§Ü§ê§Ö§ß§Ñ. ? §±§â§à§Ô§â§Ñ§Þ§Þ§Ú§ã§ä§å §á§â§à§ã§ä§à §ß§Ö §ç§à§é§Ö§ä§ã§ñ §Ö§Ô§à §á§Ö§â§Ö§á§Ú§ã§í§Ó§Ñ§ä§î, §á§à§ä§à§Þ§å §Ü§Ñ§Ü §Ü§Ñ§Ø§Ö§ä§ã§ñ, §é§ä§à §ï§ä§à§ä §Ó§à§Ù§Ó§â§Ñ§ä §ß§å§Ø§Ö§ß (§Ó§à§Ù§Ó§â§Ñ§ë§Ñ§Ö§Þ§ã§ñ §Ü §Ú§ã§ç§à§Õ§ß§à§Þ§å §à§Ò§ì§ñ§ã§ß§Ö§ß§Ú§ð).
- 21. Metaprogramming to the recsue if permission.can? can permission.action.to_sym, subject else cannot permission.action.to_sym, subject end vs. method = permission.can? ? :can : :cannot send method, permission.action.to_sym, subject
- 22. §³§á§à§ã§à§Ò§í §Ò§à§â§î§Ò§í ? §©§ß§Ñ§ß§Ú§Ö §ñ§Ù§í§Ü§Ñ ? §¬§â§Ú§ä§Ú§é§Ö§ã§Ü§Ú§Û §Ó§Ù§Ô§Ý§ñ§Õ §ß§Ñ §ã§Ó§à§Û §Ü§à§Õ ? Let it fail (hoptoad §Ó §á§à§Þ§à§ë§î)