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# `sol.models.rating` – Ratings

class `sol.models.rating.``Rating`(**kwargs)

  A particular rating a tournament can be related to.

  `default_deviation`

    Default value of deviation (PHI) for the Glicko2 algorithm.

  `default_rate`

    Default value of rate (MU) for the Glicko2 algorithm.

  `default_volatility`

    Default value of volatility (SIGMA) for the Glicko2 algorithm.

  `description`

    Description of the rating.

  `getPlayerRating`(player, before=None)

    Return the rate of a player

    Parameters: | player – a Player instance before – a date instance
    Return type: | an instance of glicko2.Rating

    If before is not specified fetch the latest rate, otherwise the most recent one preceeding before.

    The method considers the referenced rating as well as all those with an higher level.

  `higher_rate`

    Higher value of the range used to interpolate players rates.

  `idowner`

    ID of the `user` that is responsible for this record.

  `idrating`

    Primary key.

  `inherit`

    Whether to lookup rates in higher levels ratings.

  `isPhantom`(competitor)

    Determine whether the given competitor is actually a Phantom.

    Parameters: | competitor – a Competitor instance

    This is needed because someone use a concrete player as Phantom, to customize its name (not everybody have a good sense of humor...)

  `level`

    Rating level.

  `lower_rate`

    Lower value of the range used to interpolate players rates when (almost) all competitors are unrated.

  `outcomes`

    Kind of formula used to compute match outcomes.

    This is used to determine which formula will be used to compute the match outcomes to feed Glicko2 algorithm. It may be:

    glicko2
      standard Glicko, giving 1.0 to the winner and 0.0 to the loser, 0.5 in case of draw, developed with Chess in mind;
    guido
      Guido’s variant, better suited to Carrom: basically each player is assigned a fraction of his own score divided by the sum of the scores of both players;
    expds
      an exponential formula applied to the two concurrents final scores difference.
  `owner`

    The `owner` of this record, admin when `None`.

  `ranking`

    Players sorted by their latest rate.

    Return type: | sequence
    Returns: | a sorted list of tuples containing the `player`, its latest rate, deviation and volatility, and the number of rates in this rating.

  `rates`

    List of `rates`.

  `recompute`(mindate=None, scratch=False)

    Recompute the whole rating.

    Parameters: | mindate – either `None` or a date scratch – a boolean, True to recompute from scratch

    If mindate is given, recompute the rating ignoring the tourneys before that date.

  `serialize`(serializer)

    Reduce a single rating to a simple dictionary.

    Parameters: | serializer – a `Serializer` instance
    Return type: | dict
    Returns: | a plain dictionary containing a flatified view of this rating

  `tau`

    Value of TAU for the Glicko2 algorithm.

  `time_span`

    Return the time span of this rating.

  `tourneys`

    `Tourneys` using this rating.

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