app/models/picture.rb
class Picture < ActiveRecord::Base
belongs_to :movie
# attr_accessible :image
#paperclip multiple pictures
has_attached_file :image,
:styles => { :small => '150x',
:medium => '300x',
:large => '600x'},
:default_url => "",
:storage => :s3,
:bucket => ENV["AWS_BUCKET_NAME"],
:path => "/:class/:pictures/:id/:style/:basename.:extension"
validates_attachment_presence :image, :message => "Photo can't be blank"
validates_attachment_size :image, :less_than => 5.megabytes
validates_attachment_content_type :image, :content_type => ['image/jpeg', 'image/png']
end