python - rewrite sql query using Django db Api -

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these models in django

class match(models.model):     team_a = models.foreignkey("team", related_name="team_a")     equipo_b = models.foreignkey("team", related_name="team_b")     goals_team_a = models.integerfield(default=0)     goals_team_b = models.integerfield(default=0)     winner_team = models.foreignkey("team", related_name="winner_team", null=true)     match_type = models.charfield(choices=match_type_choices, max_length=100, null=false)     match_played = models.booleanfield(default=false)     date = models.datefield()  class team(models.model):     name = models.charfield(max_length=200)     group = models.charfield(choices=group_choices, max_length=1, null=false)     matches_played = models.integerfield(default=0)     matches_won = models.integerfield(default=0)     matches_lost = models.integerfield(default=0)     matches_tied = models.integerfield(default=0)     goals_in_favor = models.integerfield(default=0)     goals_agaiinst = models.integerfield(default=0)     points = models.integerfield(default=0)     url_flag = models.charfield(max_length=500)

and have following sentence in raw sql:

select    (select sum(goals_team_a) match team_a_id=9) +   (select sum(goals_team_b) match team_b_id=9) goals_in_favor,   (select sum(goals_team_b) match team_a_id=9) +   (select sum(goals_team_a) match team_b_id=9) goles_against ;

i'm looking efficient way rewrite query using django queryset api, can't find way it, have clue have use annotate() function, don't know how.

finally came resolution:

def count_goals_in_favor(team):     goals_home = partido.objects.filter(team_a=team).extra(         select={"total_goals": "sum(goals_team_a)"}).values("total_goals")     goals_away = partido.objects.filter(team_b=team).extra(         select={"total_goals": "sum(goals_team_b)"}).values("total_goals")    return goals_home[0]['total_goals'] + goals_away[0]['total_goals']   def count_goals_against(team):     goals_home = partido.objects.filter(team_a=team).extra(         select={"total_goals": "sum(goals_team_b)"}).values("total_goals")     goals_away = partido.objects.filter(team_b=team).extra(         select={"total_goals": "sum(goals_team_a)"}).values("total_goals")     return goals_home[0]['total_goals'] + goals_away[0]['total_goals']  class team(models.model):     pass # code put in question     def goals_difference(self):         return self.goals_in_favor - self.goals_against  class match(models.model):     pass # code put in question     def save(self):         self.team_a.goals_in_favor = count_ goals_in_favor(self.team_a)         self.team_a.goals_against = count_goals_against(self.team_a)

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