attr-accessor

问题 In Rails, I have a User model. I added attr_accessor :score to the model. If I render the JSON for one user, I do not see the "score" attribute. Why is this? user = User.find(3) user.score = 55 render json: user 回答1: render json: user, methods: [:score] attr_accessor is alternative for getter and setter method so it is a method and as I have mentioned we can call it as above 来源： https://stackoverflow.com/questions/30641623/property-from-attr-accessor-does-not-show-when-i-render-json

问题 In Rails, I have a User model. I added attr_accessor :score to the model. If I render the JSON for one user, I do not see the "score" attribute. Why is this? user = User.find(3) user.score = 55 render json: user 回答1: render json: user, methods: [:score] attr_accessor is alternative for getter and setter method so it is a method and as I have mentioned we can call it as above 来源： https://stackoverflow.com/questions/30641623/property-from-attr-accessor-does-not-show-when-i-render-json

问题 In Rails, I have a User model. I added attr_accessor :score to the model. If I render the JSON for one user, I do not see the "score" attribute. Why is this? user = User.find(3) user.score = 55 render json: user 回答1: render json: user, methods: [:score] attr_accessor is alternative for getter and setter method so it is a method and as I have mentioned we can call it as above 来源： https://stackoverflow.com/questions/30641623/property-from-attr-accessor-does-not-show-when-i-render-json

问题 faced with an issue where @user.reset_token returns nil. app/views/user_mailer/password_reset.html.erb <%= link_to "Reset password", edit_password_reset_url(@user.reset_token, email: @user.email) %> Reset_token is declared in User model, whereby this problem happens when I try to use a sidekiq worker. Refer to code below. app/models/user.rb class User < ActiveRecord::Base attr_accessor :reset_token def User.new_token SecureRandom.urlsafe_base64 end def send_password_reset_email

问题 I just tested attr_accessor against equivalent getter/setter-methods: class A # we define two R/W attributes with accessors attr_accessor :acc, :bcc # we define two attributes with getter/setter-functions def dirA=(d); @dirA=d; end def dirA; @dirA; end def dirB=(d); @dirB=d; end def dirB; @dirB; end end varA = A.new startT = 0 dirT = 0 accT = 0 # now we do 100 times the same benchmarking # where we do the same assignment operation # 50000 times 100.times do startT = Time.now.to_f 50000.times

问题 I want to implement a (class) method attr_accessor_with_client_reset , which does the same thing as attr_accessor , but on every writer it additionally executes @client = nil So, for example, attr_accessor_with_client_reset :foo should produce the same result as attr_reader :foo def foo=(value) @foo = value @client = nil end How do I achieve this? 回答1: Sergio's solution is good, but needlessly complex: there's no need to duplicate the behavior of attr_reader , you can just delegate to it. And

问题 I'm working with some models where a lot of a given model's key attributes are actually stored in a submodel. Example: class WikiArticle has_many :revisions has_one :current_revision, :class_name => "Revision", :order => "created_at DESC" end class Revision has_one :wiki_article end The Revision class has a ton of database fields, and the WikiArticle has very few. However, I often have to access a Revision's fields from the context of a WikiArticle. The most important case of this is probably

问题 I dynamically created an instance variable within my class: class Mine attr_accessor :some_var def intialize @some_var = true end def my_number num self.instance_variable_set "@my_#{num}", num end end How do I make @my_#{num} now as an attr value? e.g. I want to be able to do this: dude = Mine.new dude.my_number 1 dude.my_1 => 1 回答1: this answer doesn't pollutes the class space, example.. if i do mine.my_number 4 then the other instances of Mine will not get the my_4 method.. this happens

问题 Setting up paperclip with S3 in my linux dev environment was a snap -- everything works out of the box. However, I can't get it to work on Heroku. When I try to do an upload, the log shows: Processing ItemsController#create (for 72.177.97.9 at 2010-08-26 16:35:14) [POST] Parameters: {"commit"=>"Create", "authenticity_token"=>"0Hy3qvQBHE1gvFVaq32HMy2ZIopelV0BHbrSeHkO1Qw=", "item"=>{"photo"=>#<File:/home/slugs/270862_4aa601b_4b6f/mnt/tmp/RackMultipart20100826-6286-1256pvc-0>, "price"=>"342",

问题 Setting up paperclip with S3 in my linux dev environment was a snap -- everything works out of the box. However, I can't get it to work on Heroku. When I try to do an upload, the log shows: Processing ItemsController#create (for 72.177.97.9 at 2010-08-26 16:35:14) [POST] Parameters: {"commit"=>"Create", "authenticity_token"=>"0Hy3qvQBHE1gvFVaq32HMy2ZIopelV0BHbrSeHkO1Qw=", "item"=>{"photo"=>#<File:/home/slugs/270862_4aa601b_4b6f/mnt/tmp/RackMultipart20100826-6286-1256pvc-0>, "price"=>"342",