fab-manager/config/initializers/postgresql_database_tasks.rb

# frozen_string_literal: true

module ActiveRecord
  module Tasks
    # The following magic allows to drop a PG database even if a connection exists
    # @see https://stackoverflow.com/a/38710021
    class PostgreSQLDatabaseTasks
      include ActiveRecord::Sanitization::ClassMethods

      def drop
        establish_master_connection
        q = sanitize_sql_array [
          "select pg_terminate_backend(pg_stat_activity.pid) from pg_stat_activity where datname= ? AND state='idle';",
          configuration['database']
        ]
        connection.select_all q
        connection.drop_database configuration['database']
      end
    end
  end
end