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Versions: 30
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Contents
# frozen_string_literal: true
require "sequel/timestamp_migrator_undo_extension"
namespace :sequel do
# Rollback migrations that are absent in revision when deploying on staging
task rollback_missing_migrations: :environment do
# Extract migrations
def extract_migrations(path)
Dir.glob("#{path}/db/migrate/*.rb").map { |filename| File.basename(filename).to_i }
end
old_migrations = extract_migrations(ENV["OLD_RELEASE"])
new_migrations = extract_migrations(ENV["NEW_RELEASE"])
migrations_to_rollback = old_migrations - new_migrations
next if migrations_to_rollback.empty?
puts "Rolling back migrations:"
puts migrations_to_rollback
path = ::Rails.root.join("db/migrate")
migrator = Sequel::TimestampMigrator.new(DB, path, allow_missing_migration_files: true)
applied_migrations = migrator.applied_migrations.map(&:to_i)
migrations = applied_migrations.select { |m| m.in?(migrations_to_rollback) }.sort.reverse
migrations.each { |migration| migrator.undo(migration) }
end
end
Version data entries
30 entries across 30 versions & 1 rubygems