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names = []

# Using SQL string

Bike.where("name IN (?)", names).to_sql
=> "SELECT \"bikes\".* FROM \"bikes\"  WHERE (name IN (NULL))"

Bike.where("name NOT IN (?)", names).to_sql
=> "SELECT \"bikes\".* FROM \"bikes\"  WHERE (name NOT IN (NULL))"

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class Claim < ActiveRecord::Base
  belongs_to :client
  
  validate :check_eligibility, on: :create
  before_save :set_claim_amount
  
  def eligible_amount
    # to be overriden
  end
  

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# place it it application.rb or initializers


module ActionView
  module RecordIdentifier
    JOIN = '-'.freeze
  end

  module Helpers
    module Tags # :nodoc:

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How to install Fedora 20 via Network PXE with OSX 10.9

1. Install DHCP server first: brew install isc-dhcp
2. Follow the instructions after the installation complete, that is copying plist file to /Library/LaunchDaemons/homebrew.mxcl.isc-dhcp.plist
3. Create new config file /usr/local/etc/dhcpd.conf:

default-lease-time 600;
max-lease-time 7200;

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/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/yaml.rb:4:in `<top (required)>':
It seems your ruby installation is missing psych (for YAML output).
To eliminate this warning, please install libyaml and reinstall your ruby.
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/yaml.rb:5:in `require': cannot load such file -- psych (LoadError)
	from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/yaml.rb:5:in `<top (required)>'
	from /opt/boxen/repo/.bundle/ruby/2.0.0/gems/facter-2.0.1-universal-darwin/lib/facter/util/parser.rb:6:in `require'
	from /opt/boxen/repo/.bundle/ruby/2.0.0/gems/facter-2.0.1-universal-darwin/lib/facter/util/parser.rb:6:in `<top (required)>'
	from /opt/boxen/repo/.bundle/ruby/2.0.0/gems/facter-2.0.1-universal-darwin/lib/facter/util/directory_loader.rb:18:in `require'
	from /opt/boxen/repo/.bundle/ruby/2.0.0/gems/facter-2.0.1-universal-darwin/lib/facter/util/directory_loader.rb:18:in `<top (required)>'
	from /opt/bo

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Guest OS: uname -sr # Darwin 14.0.0
Run docker via CoreOS: vagrant box list # coreos-alpha (virtualbox, 338.0.0)

$ vagrant ssh
$ docker pull ubuntu
Pulling repository ubuntu
cc0067db4f11: Error pulling image (precise) from ubuntu, endpoint: https://cdn-registry-1.docker.io/v1/, Get https://cdn-registry-1.docker.io/v1/images/cc0067db4f11198ef6fd0435f96a973e559b1cebfceb2bc8e4fe527b32045c2f/ancestry: dial tcp: lookup cdn-registry-1.dcc0067db4f11: Error pulling image (precise) from ubuntu, Get https://cdn-registry-1.docker.io/v1/images/cc0067db4f11198ef6fd0435f96a973e559b1cebfceb2bc8e4fe527b32045c2f/ancestry: dial tcp: lookup cdn-registry-1.docker.io on [10.0.2.3]:53: too many redirects 
6006e6343fad: Error pulling image (quantal) from ubuntu, endpoint: https://cdn-registry-1.docker.io/v1/, Get https://cdn-registry-1.docker.io/v1/images/6006e6343fadaaeb5dd98436a3cd17eac8c03cabca1ed4c8778d039e72ebcc9c/ancestry: dial tcp: lookup cdn-registry-1.d6006e6343fad: Error pulling image (quantal) from ubuntu, Get https://c

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A friend of mine was asking why Ruby could not get a plus of 2 float correct..

A simple C++ code:

#include <iostream>
int main(int argc, const char* argv[])
{       
  float a = 3.151;
 float b = 3.023;

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Things in the documentation we could use further help with:

Extensions Tutorial

"If you are using a 2.1.x version of Spree, the above line will work fine. If you’re using a 2.0.x version of Spree, you’ll need to change the “branch” option to point to the “2-0-stable” branch. If you’re using the “master” branch of Spree, change the “branch” argument for “spree_fancy” to be “master” as well."

Q. Where can we see an overview of the branch structure in Spree?

A. Spree releases are kept in git branches, you can clone the spree and do git branch to see all branches.

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#!/bin/bash

CONTAINER_IDS=$(docker ps -a -q)

if [ -n "$CONTAINER_IDS" ]; then
  docker stop $CONTAINER_IDS
  docker rm $CONTAINER_IDS
fi

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Lotus Console

A simple rake task that replicates the rails console for Lotus Framework

How to?

I assume that your config/application.rb is the place where you initialize all Lotus boot config

below is my config/application.rb for your interest