Uniqueness::Model::ClassMethods#has_unique_field

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Adds random field support to Rails models

Examples:
  To auto-generate a new random string for field +foo+
  has_random_field :foo

  You can customize the generated string by
  passing an options hash. The following keys are supported:

  +:length+ number of characters, defaults to <tt>32</tt>

  +:case_sensitive+ defaults to <tt>true</tt>

  +:type+ type of string, defaults to <tt>:auto</tt>
          can be one of: <tt>:human</tt>, <tt>:auto</tt>

  +:blacklist+ characters to exclude when generating the random
               string, defaults to <tt>[]</tt>

  +:scope+ defines the `ActiveRecord` `scope` applied before
           calculating the `position` field value.
           defaults to <tt>[]</tt>
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