Validate Uniques in Activerecord

# For a Model where we want to have an unique combo of two fields
# Example: slug/category_id

# In Model class
validates :slug, uniqueness: { scope: :category_id, case_sensitive: false }

# In Migration
add_index :posts, [:slug, :category_id], unique: true

Activerecord Email Validator

# Validator
class EmailValidator < ActiveModel::EachValidator
  def validate_each(record, attribute, value)
    unless value =~ /\A([^@\s]+)@((?:[-a-z0-9]+\.)+[a-z]{2,})\z/i
      record.errors[attribute] << (options[:message] || "is not a valid e-mail address")

# In model...
validates :email, email: true

CORS ( Cross-Origin Resource Sharing)

# Hey: This is just a base work, for security reasons make sure you understand what it does.
before '/api/*' do
  # CORS Headers
  headers_list = {
    'Access-Control-Allow-Origin' => "*",
    'Access-Control-Allow-Headers' => 'Authorization,Accepts,Content-Type,X-CSRF-Token,X-Requested-With',
    'Access-Control-Allow-Methods' => 'GET,OPTIONS'

  headers headers_list

  content_type :json

  #halt 401, api_repsonse(false, 'Not authorized') unless valid_apikey?()

options "/api/*" do
  response.headers["Allow"] = "HEAD,GET,PUT,DELETE,OPTIONS"

  # Needed for AngularJS (?)
  response.headers["Access-Control-Allow-Headers"] = "X-Requested-With, X-HTTP-Method-Override, Content-Type, Cache-Control, Accept"

  halt 200
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