『エンタープライズRails』に学ぶ企業ユーザのためのRailsアーキテクチャ

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class Employee < ActiveRecord::Base validates_presence_of :name CREATE TABLE employees ( name VARCHAR(40) NOT NULL,

class Employee < ActiveRecord::Base validates_length_of :login, :minimum => 5 CREATE TABLE employees ( login VARCHAR(10) check(length(login) > 4),

begin emp = Employee.new(:login => '') emp.save_with_validation(false) fail rescue ActveRecord::StatementInvalid end

Departments Employees

class Employee < ActiveRecord::Base belongs_to :department validates_presence_of :department CREATE TABLE employees ( department_id INTEGER NOT NULL REFERENCES departments(id),

Companies Departments Employees

has_many :though company.employees.size SELECT count(*) AS count_all FROM employees INNER JOIN departments ON employees.department_id = departments.id WHERE departments.company_id = 1

SELECT count(*) AS count_all FROM employees WHERE company_id = 1 Companies ? Departments Employees

company_id department_id Companies Departments Employees id id id company_id company_id department_id

Companies Departments Employees id company_id id department_id company_id department_id

departments CREATE TABLE departments( company_id INTEGER NOT NULL REFERENCES companies(id), department_id SERIAL NOT NULL, PRIMARY KEY (company_id, department_id)

employees CREATE TABLE employees( company_id INTEGER NOT NULL REFERENCES companies(id), department_id INTEGER NOT NULL, FOREIGN KEY (company_id, department_id) REFERENCES department (company_id, department_id)

departments company_id department_id employees Companies Departments Employees id company_id id department_id company_id department_id

# gem install composite_primary_keys

Department class Department < ActiveRecord::Base set_primary_keys :company_id, :department_id has_many :employees, :foreign_keys => [:company_id, :department_id]

Company class Company < ActiveRecord::Base def employees_size Employee.count( :conditions => ['company_id = ?', id]) end

CREATE VIEW big_campanies AS SELECT * FROM companies WHERE id IN (SELECT company_id FROM (SELECT compay_id, count(id) AS c FROM employees GROUP BY company_id) AS t WEHRE c > 1000)

BigCampany class BigCampany < ActiveRecord::Base has_many :department end

SELECT * FROM (SELCT * FROM ...)

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『エンタープライズRails』に学ぶ企業ユーザのためのRailsアーキテクチャ

by Naoto Takai on Jul 17, 2009

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『エンタープライズRails』に学ぶ企業ユーザのためのRailsアーキテクチャ — Presentation Transcript