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class Court < ActiveRecord::Base
  validates_format_of :slug, with: /\A[a-zA-Z-]+\z/, allow_nil: true

  extend FriendlyId
  friendly_id :slug_candidates, use: [:slugged, :history, :finders]  

  private

  def slug_candidates
    candidates = [:name]

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user = User.first
user.avatar.file.exists?

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class AvatarUploader < CarrierWave::Uploader::Base
    storage :fog
end

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class User < ActiveRecord::Base
  mount_uploader :avatar, AvatarUploader
end

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!.*/(\.[^/]*|vendor/.*|doc|rails_root|CVS|log|data_dump|build|_darcs|pkg |_MTN|\{arch\}|blib|.*~\.nib|.*\.(framework|app|pbproj|pbxproj|xcode(proj)? |bundle))$

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#paperclip.rb in config/initializers
Paperclip.interpolates :created_at do |attachment, style|
  attachment.instance.created_at.to_i
end

# path in your model will look like this 
# :path => ":attachment/gallery/:id/:created_at/:style.:extension"

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certificate = OpenSSL::X509::Certificate.new(File.read("#{Rails.root}/certificate.pem"))

#public key from certificate
public_key = cert.public_key

#or public key from file
public_key = OpenSSL::PKey::RSA.new("#{Rails.root}/public_key.pem")

clear_text = public_key.public_decrypt(encrypted_text)

zaparka

this file  http://github.com/qoobaa/s3.git belongs to config/initializers/

In your Model:

 has_attached_file :picture,
      :styles => {
        :banner => '475x233#',
        :thumbnail => '111x50#'
      },
      :storage => :s3,

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$('.it')
  .bind('enqueued', function() {...})
  .bind('running', function() {...})
  .bind('passed', function() {...})
  .bind('failed', function(e, reason) {...})

$(Screw)
  .bind('loading', function() {...})
  .bind('loaded', function() {...})
  .bind('before', function() {...})

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Screw.Matchers["be_even"] = {
  match: function(expected, actual) {
    return actual % 2 == 0;
  },
  failure_message: function(expected, actual, not) {
    return 'expected ' + $.print(actual) + (not ? ' not' : '') + ' to be even';
  }
}