Find many values : Search « ActiveRecord « Ruby

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Find many values

=begin

drop database Contact;

create database Contact;

use Contact;

CREATE TABLE Employee (
   id  int unsigned not null auto_increment primary key,
   Name VARCHAR(50),
   Phone VARCHAR(15),
   departmentId int
);


CREATE TABLE Department(
   id    int unsigned not null auto_increment primary key,
   Name VARCHAR(50),
   Phone VARCHAR(15)
   
);



=end

require "rubygems"
require "activerecord"

ActiveRecord::Base.establish_connection(
  :adapter => "mysql",
  :host => "localhost",
  :username => "root",
  :database => "Contact")

class Employee < ActiveRecord::Base
   set_table_name "employee"
   belongs_to :department
end

class Department < ActiveRecord::Base
   set_table_name "department"
   has_many :children, :class_name => "Employee", :foreign_key => :departmentId
end



account = Employee.new
account.Name = "AAA"
account.save

department = Department.find_or_create_by_Name("B")
department.children << account
department.save


e = Employee.find 5 is equivalent to SELECT * FROM employee WHERE (id = 5)

es = Employee.find 1, 3, 5, 7, 9 is equivalent to SELECT * FROM employee WHERE (id IN ( 1, 3, 5, 7, 9 ))

 

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