```ruby
class Tag
  include Mongoid::Document

  field :name,      type: String
  field :namespace, type: String
  field :icon,      type: String

  validates_presence_of :name

  before_validation :on => :create do
    generate_namespace
  end

  validates_uniqueness_of :namespace

  attr_protected :namespace

  mount_uploader :icon, IconUploader

  def icon_prefix
    "https://voxe.s3.amazonaws.com/tags/v2-#{namespace}_"
  end

  def icon_sizes
    [32, 64]
  end

  def icon_name
    ".png"
  end

  def to_s
    name
  end

  # returns all the elections this tag has been mentioned
  def elections
    ElectionTag.where tag: id
  end

  private

  def generate_namespace
    tmp_namespace = nil
    3.times.each do |i|
      puts i
      if i.zero?
        tmp_namespace = name.parameterize
      else
        tmp_namespace = "#{name.parameterize}_#{i}"
      end

      break if Tag.where(namespace: tmp_namespace).empty?
    end
    self.namespace = tmp_namespace
  end

end
```

Tag namespace anticollision should be case sensitive
user
```ruby
class Tag
  include Mongoid::Document

  field :name,      type: String
  field :namespace, type: String
  field :icon,      type: String

  validates_presence_of :name

  before_validation :on => :create do
    generate_namespace
  end

  validates_uniqueness_of :namespace

  attr_protected :namespace

  mount_uploader :icon, IconUploader

  def icon_prefix
    "https://voxe.s3.amazonaws.com/tags/v2-#{namespace}_"
  end

  def icon_sizes
    [32, 64]
  end

  def icon_name
    ".png"
  end

  def to_s
    name
  end

  # returns all the elections this tag has been mentioned
  def elections
    ElectionTag.where tag: id
  end

  private

  def generate_namespace
    tmp_namespace = nil
    3.times.each do |i|
      puts i
      if i.zero?
        tmp_namespace = name.parameterize
      else
        tmp_namespace = "#{name.parameterize}_#{i}"
      end

      break if Tag.where(namespace: /#{tmp_namespace}/i).empty?
    end
    self.namespace = tmp_namespace
  end

end
```
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