class ActiveRecord::ConnectionAdapters::PostgreSQLAdapter

def configure_connection
  if @config[:encoding]
    @connection.set_client_encoding(@config[:encoding])
  end
  self.client_min_messages = @config[:min_messages] || "warning"
  self.schema_search_path = @config[:schema_search_path] || @config[:schema_order]
  # Use standard-conforming strings so we don't have to do the E'...' dance.
  set_standard_conforming_strings
  variables = @config.fetch(:variables, {}).stringify_keys
  # If using Active Record's time zone support configure the connection to return
  # TIMESTAMP WITH ZONE types in UTC.
  unless variables["timezone"]
    if ActiveRecord.default_timezone == :utc
      variables["timezone"] = "UTC"
    elsif @local_tz
      variables["timezone"] = @local_tz
    end
  end
  # Set interval output format to ISO 8601 for ease of parsing by ActiveSupport::Duration.parse
  execute("SET intervalstyle = iso_8601", "SCHEMA")
  # SET statements from :variables config hash
  # https://www.postgresql.org/docs/current/static/sql-set.html
  variables.map do |k, v|
    if v == ":default" || v == :default
      # Sets the value to the global or compile default
      execute("SET SESSION #{k} TO DEFAULT", "SCHEMA")
    elsif !v.nil?
      execute("SET SESSION #{k} TO #{quote(v)}", "SCHEMA")
    end
  end
end