code: def _get_or_create_run(build):
      
      release_name, release_number = _get_release_params()
      run_name = request.form.get('run_name', type=str)
      utils.jsonify_assert(run_name, 'run_name required')
  
      release = (
          models.Release.query
          .filter_by(build_id=build.id, name=release_name, number=release_number)
          .first())
      utils.jsonify_assert(release, 'release does not exist')
  
      run = (
          models.Run.query
          .filter_by(release_id=release.id, name=run_name)
          .first())
      if not run:
          # Ignore re-reports of the same run name for this release.
          logging.info('Created run: build_id=%r, release_name=%r, '
                       'release_number=%d, run_name=%r',
                       build.id, release.name, release.number, run_name)
          run = models.Run(
              release_id=release.id,
              name=run_name,
              status=models.Run.DATA_PENDING)
          db.session.add(run)
          db.session.flush()
  
      return release, run
docs: Gets a run for a build or creates it if it does not exist.