code: def job_from_resource(self, resource):
          
          config = resource.get("configuration", {})
          if "load" in config:
              return job.LoadJob.from_api_repr(resource, self)
          elif "copy" in config:
              return job.CopyJob.from_api_repr(resource, self)
          elif "extract" in config:
              return job.ExtractJob.from_api_repr(resource, self)
          elif "query" in config:
              return job.QueryJob.from_api_repr(resource, self)
          return job.UnknownJob.from_api_repr(resource, self)
docs: Detect correct job type from resource and instantiate.
  
          :type resource: dict
          :param resource: one job resource from API response
  
          :rtype: One of:
                  :class:`google.cloud.bigquery.job.LoadJob`,
                  :class:`google.cloud.bigquery.job.CopyJob`,
                  :class:`google.cloud.bigquery.job.ExtractJob`,
                  or :class:`google.cloud.bigquery.job.QueryJob`
          :returns: the job instance, constructed via the resource