sudo -u postgres pg_dump -Fc »db_name« > *dump_name*.dump

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If you're using the friendly_id gem in your rails project you've recognized the hyphen in the slug.
E.g. you registered a new user:
foo bar
the slug will be foo-bar by default.
That is not comfortable for some reasons, an underscore will be the better solution.
Type in your model:

class User < ActiveRecord::Base


  extend FriendlyId

  friendly_id :name, use: :slugged, :sequence_seperator => '_'

  def normalize_friendly_id(text)

    super.gsub('-', '_')

  end

end