Module: UsernameSuggester::UsernameSuggestions::ClassMethods

Defined in:
lib/username_suggester/suggestions_for.rb

Instance Method Summary collapse

Instance Method Details

#suggestions_for(attribute = :username, options = {}) ⇒ Object

Creates method to generate suggestions for an username attributes. Example:

suggestions_for :username, :num_suggestions => 5, 
  :first_name_attribute => :first, :last_name_attribute => last

will creates a “username_suggestions” method which generates suggestions of usernames based on first name and last name

Available options are:

:attribute

The name of the attribute for storing username. Default is :username

:first_name_attribute

The attribute which stores the first name. Default is :first_name

:last_name_attribute

The attribute which stores the last name. Default is :last_name

:num_suggestions

Maximum suggestions generated. Default is 10

:validate: An Proc object which takes in an username and return true if this is an validate username



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# File 'lib/username_suggester/suggestions_for.rb', line 23

def suggestions_for(attribute = :username, options = {})        
  first_name_attribute = options[:first_name_attribute] || :first_name
  last_name_attribute = options[:last_name_attribute] || :last_name
  num_suggestions = options[:num_suggestions] || 10
  
  send :define_method, "#{attribute}_suggestions".to_sym do
    suggester = Suggester.new(send(first_name_attribute), send(last_name_attribute), options)
    name_combinations_with_regex = suggester.name_combinations.map { |s| "^#{s}[0-9]*$" }
    sql_conditions = Array.new(name_combinations_with_regex.size, "#{attribute} RLIKE ?").join(" OR ")
    unavailable_choices = self.class.all(:select => attribute, 
      :conditions => [sql_conditions].concat(name_combinations_with_regex)).map{ |c| c.send(attribute) }
    suggester.suggest(num_suggestions, unavailable_choices)
  end
end