Module: ValidatesLengthsFromDatabase::ClassMethods

Defined in:
lib/validates_lengths_from_database.rb

Instance Method Summary collapse

Instance Method Details

#validates_lengths_from_database(options = {}) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/validates_lengths_from_database.rb', line 11

def validates_lengths_from_database(options = {})
  return unless self.table_exists? #return if table does not exist. Happens in test env during migration
  options.symbolize_keys!

  raise ArgumentError, "The :only option to validates_lengths_from_database must be an array." if options[:only] and !options[:only].is_a?(Array)
  raise ArgumentError, "The :except option to validates_lengths_from_database must be an array." if options[:except] and !options[:except].is_a?(Array)

  if options[:only]
    columns_to_validate = options[:only].map(&:to_s)
  else
    columns_to_validate = column_names.map(&:to_s)
    columns_to_validate -= options[:except].map(&:to_s) if options[:except]
  end

  columns_to_validate.each do |column|
    column_schema = columns.find {|c| c.name == column }
    next if column_schema.nil?
    next if ![:string, :text].include?(column_schema.type)
    next if column_schema.limit.nil?

    class_eval do
      validates_length_of column, :maximum => column_schema.limit, :allow_blank => true
    end
  end

  nil
end