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# See http://doc.gitlab.com/ce/development/migration_style_guide.html
# for more information on how to write migrations for GitLab.
class AddEnvironmentSlug < ActiveRecord::Migration
include Gitlab::Database::MigrationHelpers
DOWNTIME = true
DOWNTIME_REASON = 'Adding NOT NULL column environments.slug with dependent data'
# Used to generate random suffixes for the slug
LETTERS = 'a'..'z'
NUMBERS = '0'..'9'
SUFFIX_CHARS = LETTERS.to_a + NUMBERS.to_a
def up
environments = Arel::Table.new(:environments)
add_column :environments, :slug, :string
finder = environments.project(:id, :name)
connection.exec_query(finder.to_sql).rows.each do |id, name|
updater = Arel::UpdateManager.new(ActiveRecord::Base).
table(environments).
set(environments[:slug] => generate_slug(name)).
where(environments[:id].eq(id))
connection.exec_update(updater.to_sql, self.class.name, [])
end
change_column_null :environments, :slug, false
end
def down
remove_column :environments, :slug
end
# Copy of the Environment#generate_slug implementation
def generate_slug(name)
# Lowercase letters and numbers only
slugified = name.to_s.downcase.gsub(/[^a-z0-9]/, '-')
# Must start with a letter
slugified = 'env-' + slugified unless LETTERS.cover?(slugified[0])
# Repeated dashes are invalid (OpenShift limitation)
slugified.gsub!(/\-+/, '-')
# Maximum length: 24 characters (OpenShift limitation)
slugified = slugified[0..23]
# Cannot end with a dash (Kubernetes label limitation)
slugified.chop! if slugified.end_with?('-')
# Add a random suffix, shortening the current string if necessary, if it
# has been slugified. This ensures uniqueness.
if slugified != name
slugified = slugified[0..16]
slugified << '-' unless slugified.end_with?('-')
slugified << random_suffix
end
slugified
end
def random_suffix
(0..5).map { SUFFIX_CHARS.sample }.join
end
end
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