我的model.py：

# Riders models ----------------------------------------
class CategoryTeam(models.Model):

    name = models.CharField(max_length = 256)

    def __str__(self):
        return self.name

class Teams(models.Model):

    name = models.CharField(max_length = 256)
    code = models.CharField(max_length = 10)
    nation = models.CharField(max_length = 10)
    continent = models.CharField(max_length = 10)
    category = models.ForeignKey(CategoryTeam, on_delete=models.CASCADE,)

    def __str__(self):
        return self.name

#-----------------------------------------------------#

我要填充的脚本

from basic_app.models import CategoryTeam,Teams



def populateCat():
    f = open('CategoryCSV.csv')
    reader = csv.reader(f)
    next(reader)
    for row in reader:

        # Create new User Entry
        category = CategoryTeam.objects.get_or_create(name=row[0])[0]

def populateTeamat():
    f = open('FantaDS Project - Teams.csv')
    reader = csv.reader(f)
    next(reader)
    for row in reader:

        # Create new User Entry
        team = Teams.objects.get_or_create(
                                        name = row[0],
                                        code = row[1],
                                        nation = row[2],
                                        continent = row[3],
                                        category = row[4]
                                        )[0]

if __name__ == '__main__':
    print("Populating the databases Cat...Please Wait")
    populateCat()
    print('Populating Complete')
    print("Populating the databases Team...Please Wait")
    populateTeamat()
    print('Populating Complete')

生成的exeption：

文件"C：\用户\Wynt\AppData\local\conda\conda\envs\DjangoEnv\lib\site-包\django\db\backend\utils.py"，第85行，_execute返回self.cursor.execute（sql，params）
文件"C：\用户\Wynt\AppData\local\conda\conda\envs\DjangoEnv\lib\site-包\django\db\utils.py"，第89行，__exit__raisendj_exc_value.with_traceback（回溯），来自exc_value
File"C：\用户\Wynt\AppData\local\conda\conda\envs\DjangoEnv\lib\site-包\django\db\后端\utils.py"，第85行，在_execute中返回self.cursor.execute（sql， params）
File"C：\用户\Wynt\AppData\local\conda\conda\envs\DjangoEnv\lib\site-包\django\db\后端\sqlite3\base.py"，第303行，在执行返回数据库中。Cursor.execute（自我，查询，参数）django.db.utils.完整性错误：非空约束失败：basic_app_teams.category_id