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Wrapping up I personally tend to use scopes when the logic is very small, for simple where/order clauses, and class methods when it involves a bit more complexity, but whether it But if no date was specified, you wanted all the reviews returned instead? Or, if you’re feeling particularly tricky, a class method could grab data from a few different places: your database, Redis, or an external API or service. So 1st method is preferable.

All rights reserved. The free sample chapter of Practicing Rails will show you how. Get your free chapter of Practicing Rails Recent Posts How to Get From They’re to They’re 3 Steps to Fix Encoding Problems in Ruby Keeping Your Logs From Becoming an Unreadable Named scopes can also be procedural: class Shirt < ActiveRecord::Base scope :colored, lambda { |color| where(:color => color) } end In this example, Shirt.colored('puce') finds all puce shirts.

Tags: activerecord, rails, rails 3.2, rails 4, scopes, Posted in English, 18 Comments » Jack Dempsey Nice writeup. I checked out the docs on scope, and the examples showed 2 differences: 1) use double-quotes instead, I thought originally to allow interpolation, and 2) use a lambda, so scope :graveyard, No error. When you write scopes, you can add specific extensions that will only be available in your object if that scope is called.

In Rails 3 you can define a scope in two ways: class Post < ActiveRecord::Base scope :published, where(status: 'published') scope :draft, -> { where(status: 'draft') } end The main difference between Peter Marreck Considering that's a logical consequence of scoping on the same field twice, I don't think that's an argument against scopes. In Rails 3.2.x, you should use scoped there instead. Is it worth keeping these totally separate, but equivalent, concepts in your head?

The ambiguous "he is buried" Jokes about Monica's haircut How to explain leaving a job for a huge ethical/moral issue to a potential employer - without REALLY explaining it Americanism "to Does the local network need to be hacked first for IoT devices to be accesible? Anyway, thanks for sharing this information with others here as well. All I'm saying is `default_scope` with all its quirks should be removed and then this changed.

Every model here has a possible polymorphic relationship with Starlight. What to do with my pre-teen daughter who has been out of control since a severe accident? You should read these: Where does your code go? Assuming the following setup: class Article < ActiveRecord::Base scope :published, where(:published => true) scope :featured, where(:featured => true) def self.latest_article order('published_at desc').first end def self.titles map(&:title) end end We are able

group("users.id") } Can you please help me to resolve the same. Why is Pascal's Triangle called a Triangle? Not the answer you're looking for? ruby-on-rails share|improve this question asked Apr 29 '13 at 21:39 Reddirt 1,89332160 Show us code, where @workorders assigned –MikDiet Apr 29 '13 at 21:40 add a comment| 1 Answer

Browse other questions tagged ruby-on-rails scope rails-activerecord or ask your own question. I will need to combine the queries and sort them by created date. class User < ActiveRecord::Base has_many :dogs has_many :cats scope :pets, joins(:dogs).joins(:cats).order("created_at desc") In view <%= render @user.pets%> Is causing an no method error undefined method `pets' for # mysql ruby-on-rails-3 activerecord If you really want the SQL back for a specific find-by-id, you could use User.tardy.where(:id => 14).to_sql share|improve this answer answered Jan 7 '13 at 4:48 meagar♦ 136k21203238 I

There are two exceptions: When I need to preload scopes, I turn them into associations instead. where("timesheets.updated_at >= ?", 3.days.ago). See http://github.com/rails/rails/issues/21943 for confirmation that the old documentation is incorrect, and for a workaround. (Spoiler alert: Use all.map(&:title) instead of just map(&:title) in order to achieve the same effect.) Welcome Register Unix Exit Command Are the two sequences equal if the sums and sums of squares are equal?

Why use scopes when we already have class methods? If you have sorting code that’s easier to write in Ruby, you could grab your objects in their default order, and use sort_by to put them in the right order. Carlos Antonio Hey Chuck, thanks for your feedback. Also, just as with the association objects, named scopes act like an Array, implementing Enumerable; Shirt.red.each(&block), Shirt.red.first, and Shirt.red.inject(memo, &block) all behave as if Shirt.red really was an Array.

A scope represents a narrowing of a database query, such as where(:color => :red).select('shirts.*').includes(:washing_instructions). more hot questions question feed default about us tour help blog chat data legal privacy policy work here advertising info mobile contact us feedback Technology Life / Arts Culture / Recreation Also just to append to what you said. It'd be cool to mention how to return a relation from a class method as well, so you could keep it chainable instead of returning nil.

Sign in to comment Contact GitHub API Training Shop Blog About © 2016 GitHub, Inc. Jamie. --UPDATE This code is much nicer : scope :graveyard, where(show_location: true, location: "graveyard") snychka 2014-07-08 18:58:52 UTC #2 Hi. In myfree 7-part course, you’ll discover the fastest way to learn and remember new Rails ideas, so you can use them when you need them.And you'll learn to use what youalready NoMethodError: undefined method `tardy' for # from /home/local/rajesh.co/.rvm/gems/ruby-1.9.3-p327/gems/activemodel-3.2.9/lib/active_model/attribute_methods.rb:407:in `method_missing' from /home/local/rajesh.co/.rvm/gems/ruby-1.9.3-p327/gems/activerecord-3.2.9/lib/active_record/attribute_methods.rb:149:in `method_missing' from (irb):64 from /home/local/rajesh.co/.rvm/gems/ruby-1.9.3-p327/gems/railties-3.2.9/lib/rails/commands/console.rb:47:in `start' from /home/local/rajesh.co/.rvm/gems/ruby-1.9.3-p327/gems/railties-3.2.9/lib/rails/commands/console.rb:8:in `start' from /home/local/rajesh.co/.rvm/gems/ruby-1.9.3-p327/gems/railties-3.2.9/lib/rails/commands.rb:41:in `' from script/rails:6:in `require' from script/rails:6:in `

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diabolist - February 4, 2013 0 thanks Your scope cannot be called 'locked' see: http://github.com/rails/rails/issues/7421 see: http://github.com/rails/rails/pull/6985 class Article < ActiveRecord::Base scope :locked, where(... Why generic lambdas are allowed while nested structs with templated methods aren't? I tend to agree with both sentences, but I'd like to show some slight differences that exist between both. scope_proc = lambda do |*args| options = scope_options.respond_to?(:call) ?