base de données django erreurs de relation de many2many

Question

Salut, je suis en utilisant les modèles suivants pour construire une base de données

from django.db import models 
from django.contrib import admin 


class Team(models.Model): 
    """Model docstring""" 
    slug = models.SlugField(max_length=200) 
    Team_ID = models.AutoField(primary_key=True) 
    Team_Name = models.CharField(max_length=100,) 
    College = models.CharField(max_length=100,) 
    College = models.CharField(max_length=1,) 
    Win = models.IntegerField() 
    Loss = models.IntegerField() 
    Draw = models.IntegerField() 

class Match(models.Model): 

    Match_Id = models.AutoField(primary_key=True) 
    Team_one = models.ManyToManyField('Team',related_name='Team one',symmetrical=False,) 
    Team_two = models.ManyToManyField('Team',related_name='Team two',symmetrical=False,) 
    stadium = models.CharField(max_length=255, blank=True) 
    Start_time = models.DateTimeField(auto_now_add=False, auto_now=False, blank=True, null=True) 
    Rafree = models.CharField(max_length=255, blank=True) 
    Judge = models.CharField(max_length=255, blank=True) 
    winner = models.ForeignKey('Team', related_name='winner',to_field='Team_Name')  
    updated = models.DateTimeField('update date', auto_now=True) 
    created = models.DateTimeField('creation date', auto_now_add=True) 

quand je lance le manage.py sqlall le modèle valider bien et me donne la sortie sql comme suit

BEGIN; 
CREATE TABLE "cupmanager_player" (
    "slug" varchar(200) NOT NULL, 
    "Player_Id" serial NOT NULL PRIMARY KEY, 
    "Player_Name" varchar(100) NOT NULL, 
    "Nick" varchar(100) NOT NULL, 
    "Jersy_Number" integer NOT NULL, 
    "Team_id_id" integer NOT NULL, 
    "Poistion" varchar(1) NOT NULL, 
    "Red_card" integer NOT NULL, 
    "Yellow_card" integer NOT NULL, 
    "Points" integer NOT NULL 
) 
; 
CREATE TABLE "cupmanager_team" (
    "slug" varchar(200) NOT NULL, 
    "Team_ID" serial NOT NULL PRIMARY KEY, 
    "Team_Name" varchar(100) NOT NULL, 
    "College" varchar(1) NOT NULL, 
    "Win" integer NOT NULL, 
    "Loss" integer NOT NULL, 
    "Draw" integer NOT NULL 
) 
; 
ALTER TABLE "cupmanager_player" ADD CONSTRAINT "Team_id_id_refs_Team_ID_1a532b57"     FOREIGN KEY ("Team_id_id") REFERENCES "cupmanager_team" ("Team_ID") DEFERRABLE INITIALLY  DEFERRED; 
CREATE TABLE "cupmanager_match" (
    "Match_Id" serial NOT NULL PRIMARY KEY, 
    "stadium" varchar(255) NOT NULL, 
    "Start_time" timestamp with time zone, 
    "Rafree" varchar(255) NOT NULL, 
    "Judge" varchar(255) NOT NULL, 
    "winner_id" varchar(100) NOT NULL REFERENCES "cupmanager_team" ("Team_Name")  DEFERRABLE INITIALLY DEFERRED, 
    "updated" timestamp with time zone NOT NULL, 
    "created" timestamp with time zone NOT NULL 
) 
; 
CREATE TABLE "cupmanager_goal" (
    "Goal_ID" serial NOT NULL PRIMARY KEY, 
    "Match_ID_id" integer NOT NULL REFERENCES "cupmanager_match" ("Match_Id")  DEFERRABLE INITIALLY DEFERRED, 
    "Team_ID_id" varchar(100) NOT NULL REFERENCES "cupmanager_team" ("Team_Name") DEFERRABLE INITIALLY DEFERRED, 
    "Player_ID_id" varchar(100) NOT NULL REFERENCES "cupmanager_player" ("Player_Name") DEFERRABLE INITIALLY DEFERRED, 
    "name" varchar(100) NOT NULL, 
    "updated" timestamp with time zone NOT NULL, 
    "created" timestamp with time zone NOT NULL 
) 
; 
CREATE TABLE "cupmanager_match_Team_one" (
    "id" serial NOT NULL PRIMARY KEY, 
    "match_id" integer NOT NULL REFERENCES "cupmanager_match" ("Match_Id") DEFERRABLE INITIALLY DEFERRED, 
    "team_id" integer NOT NULL REFERENCES "cupmanager_team" ("Team_ID") DEFERRABLE INITIALLY DEFERRED, 
    UNIQUE ("match_id", "team_id") 
) 
; 
CREATE TABLE "cupmanager_match_Team_two" (
    "id" serial NOT NULL PRIMARY KEY, 
    "match_id" integer NOT NULL REFERENCES "cupmanager_match" ("Match_Id") DEFERRABLE INITIALLY DEFERRED, 
    "team_id" integer NOT NULL REFERENCES "cupmanager_team" ("Team_ID") DEFERRABLE INITIALLY DEFERRED, 
    UNIQUE ("match_id", "team_id") 
) 
; 
CREATE INDEX "cupmanager_player_slug" ON "cupmanager_player" ("slug"); 
CREATE INDEX "cupmanager_player_Team_id_id" ON "cupmanager_player" ("Team_id_id"); 
CREATE INDEX "cupmanager_team_slug" ON "cupmanager_team" ("slug"); 
CREATE INDEX "cupmanager_match_winner_id" ON "cupmanager_match" ("winner_id"); 
CREATE INDEX "cupmanager_goal_Match_ID_id" ON "cupmanager_goal" ("Match_ID_id"); 
CREATE INDEX "cupmanager_goal_Team_ID_id" ON "cupmanager_goal" ("Team_ID_id"); 
CREATE INDEX "cupmanager_goal_Player_ID_id" ON "cupmanager_goal" ("Player_ID_id"); 
COMMIT; 

mais quand je lance maintenant la commande manage.py syncdb je reçois l'erreur suivante psycopg2.ProgrammingError: there is no unique constraint matching given keys for referenced table "cupmanager_team"

une idée de ce qui se passe ici? J'utilise postgresql comme backend db et Postgresql_psycopg2 comme db back end

Answer 1

Mmh devez-vous vraiment utiliser vos propres champs de clés primaires? Si vous ne spécifiez pas de champ de clé primaire, Django crée automatiquement un champ appelé id. Je ne vois pas l'intérêt de nommer les champs, par ex. match_id, d'autant plus que vous souhaitez accéder à ce champ plus tard, il ressemblera à match.match_id.
Alors peut-être que cela fonctionne sans vos champs de clé primaire personnalisés.

De même, l'option symmetrical n'est prise en compte que si le champ référence self, c'est-à-dire la propre table, ce que vous ne faites pas ici.