MySelf.to_s

5 months ago
9 notes
Nearly everybody is convinced that every style but their own is ugly and unreadable. Leave out the “but their own” and they’re probably right…

—Jerry Coffin

7 months ago
2 notes

MicroMachine

Minimal (32 LOC) Finite State Machine

class Event < ActiveRecord::Base
  def confirm!
    confirmation.trigger(:confirm)
  end

  def cancel!
    confirmation.trigger(:cancel)
  end

  def reset!
    confirmation.trigger(:reset)
  end

  def confirmation
    @confirmation ||= begin
      confirmation = MicroMachine.new(confirmation_state || "pending")
      confirmation.transitions_for[:confirm] = { "pending" => "confirmed" }
      confirmation.transitions_for[:cancel] = { "confirmed" => "cancelled" }
      confirmation.transitions_for[:reset] = { "confirmed" => "pending", "cancelled" => "pending" }
      confirmation.on(:any) { self.confirmation_state = confirmation.state }
      confirmation
    end
  end
end
7 months ago
1 note

App Settings using ActiveRecord

# app/models/settings.rb
class Settings < ActiveRecord::Base
  validates_presence_of :name, :value
  validates_uniqueness_of :name

  class << self
    def [](name)
      Settings.find_by_name(name).value rescue nil
    end

    def []=(name, value)
      setting = Settings.find_by_name(name) || Settings.new(:name => name)
      setting.value = value
      setting.save!
      value
    end
    
    def delete(name)
      Settings.delete_all(:name => name)
    end
  end

end

8 months ago

fix.to_s(base=10) → string

Returns a string containing the representation of fix radix base (between 2 and 36). 

   12345.to_s       #=> "12345"
   12345.to_s(2)    #=> "11000000111001"
   12345.to_s(8)    #=> "30071"
   12345.to_s(10)   #=> "12345"
   12345.to_s(16)   #=> "3039"
   12345.to_s(36)   #=> "9ix"

8 months ago

Sequel: The Database Toolkit for Ruby

require 'rubygems'
require 'sequel'

DB = Sequel.sqlite # memory database

DB.create_table :items do
  primary_key :id
  String :name
  Float :price
end

items = DB[:items] # Create a dataset

# Populate the table
items.insert(:name => 'abc', :price => rand * 100)
items.insert(:name => 'def', :price => rand * 100)
items.insert(:name => 'ghi', :price => rand * 100)

# Print out the number of records
puts "Item count: #{items.count}"

# Print out the average price
puts "The average price is: #{items.avg(:price)}"

Connecting to a database

(Source: github.com)