RDBMS は便利だからもっと使っていきましょうというお話。 表参道.rb #25 Rails アンチパターン で話しました。 https://omotesandorb.connpass.com/event/62936/
UPDATE: DataMapper 2 was renamed to Ruby Object Mapper (ROM). For more info check out rom-rb.org We have a lot of different Object-Relational Mapper implementations in Ruby (and a ton and a half of Mongo mappers ;)) and it’s probably a good thing. It seems like the only ORM that really matters right now is ActiveRecord although in “the background” we still have DataMapper and Sequel with growing c
There is no documentation in Rails about how to use stored procedures or atleast it is difficult to find where to look at. And according to DHH stored procedures is not the Rails Way to do things. DHH mentioned in his post I want a single layer of cleverness: My domain model. Object-orientation is all about encapsulating clever. Letting it sieve half ways through to the database is a terrible viol
■[rails]acts_as_nested_setと格闘してみる RailsというかActiveRecordには標準的なものの他、より発展的なアソシエーションがいくつか用意されている。 今回はその中で、いまいち情報が少ないacts_as_nested_setに挑戦してみようと思う。 このacts_as_nested_setは「RailsによるアジャイルWebアプリケーション開発」でも、他のacts_asは紹介されているのにこれだけは何か重大な欠陥があるという事で紹介されていなかったり、また海外の掲示板やら見てると次バージョンのRailsからはこのnested_setが外されるとかなんとかの噂があったりと、なかなかの継子扱いだ。 ■acts_as_nested_setの機能 acts_as_nested_setってなにをするものかというと、親の下に子、子の下に孫といった階層づけされたデータ
Welcome to Better Nested Set for Ruby on Rails This is a plugin to replace acts_as_nested_set and ehance it. What is nested set ? It's a great and smart way to represent ordered trees into a table. Joe Celko explained this solution in a famous article in 1996. What is it useful for ? Categories, or menus, are often organized as ordered trees. Rails provides the good acts_as_tree, but it cannot han
This Rails plugin is an extension of ActsAsNestedSet that adds some enhancements in response to confusion about the use of ActsAsNestedSet. You might use this plugin to model a threaded discussion board. The underlying implementation uses Modified Preorder Tree Traversal for efficiency and scalability. Homepage API docs Table Schema create table tree_item ( id int(11) unsigned not null auto_incre
A Nested Set is similar to a tree from ActsAsTree. However the nested set allows building of the entire hierarchy at once instead of querying each nodes children, and their children. When destroying an object, a before_destroy trigger prunes the rest of the branch of object under the current object. Table Schema create table nested_objects ( id int(11) unsigned not null auto_increment, parent_i
Using Omnigraffle to visualise Rails model associations This week I'm doing some Rails consulting work for a company that's already developed and deployed a major application. Getting to know a new codebase takes a little time and every diagram or visualisation helps. To help me understand their ActiveRecord model relationships, I knocked together a quick script to scan the associations between m
Zero to Rails in 2 minutes Published 2005-09-15 @ 02:47 Tagged rails, ruby, toys Add one part OmniGraffle 4, one part applescript, one part ruby, and a dash of animosity towards SQL and you get the following lovely lovely dish: From absolutely nothing to a running rails app in under two minutes. SQL not required.
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