python - Django 原始 SQL 查询与外键

Question

models.py

class Author(models.Model):
    name = models.CharField(max_length=30)
    surname = models.CharField(max_length=50)

class Exhibit(models.Model):
    author_id = models.ForeignKey(Author)
    title = models.CharField(max_length=60)

create.sql (PostgreSQL)

CREATE TABLE Author (
    id serial NOT NULL,
    name varchar(30)  NOT NULL,
    surname varchar(50)  NOT NULL,
);

CREATE TABLE Exhibit (
    id serial NOT NULL,
    author_id int NOT NULL,
    title varchar(50) NOT NULL
);

这些是我的简化模型(与数据库表一对一映射)，我正在执行一个看起来像这样的原始查询

Exhibit.objects.raw("SELECT * FROM Exhibit WHERE author_id = 1")

结果，我收到一个 ValueError - Cannot allocate "1": "Exhibit.author_id"must be a "Author"实例。

有没有一种方法可以在不使用 ORM 和 Author.objects(以及类似的东西)的情况下，仅通过查询数据库来解决这个问题？

Answer 1

用户django.db.connection为此:

from django.db import connection
cursor = connection.cursor()
cursor.execute("SELECT * FROM Exhibit WHERE author_id = 1")
result = cursor.fetchall()