django实现mysql主从在写入外键时报Cannot assign “＜User: 竺新景＞“: the current database router prevents this relatio

ret = models.Project.objects.using('default').filter(id=1).first()
# models.ProjectDetailImg.objects.create(image='project_img/h1.1.jpg', home=ret, order=1))
models.ProjectDetailImg.objects.create(image='project_img/h1.2.jpg', home=ret, order=2)
models.ProjectDetailImg.objects.create(image='project_img/h1.3.jpg', home=ret, order=3)
models.ProjectDetailImg.objects.create(image='project_img/h1.4.jpg', home=ret, order=4)