django -- 联合索引

一、定义：

from django.db import models

# Create your models here.

class Person(models.Model):
    first_name = models.CharField(max_length=100)
    last_name  = models.CharField(max_length=100)

    class Meta():
        index_together = ["first_name", "last_name"]

二、生成目标SQL：

python3 manage.py makemigrations polls
Migrations for 'polls':
  polls/migrations/0001_initial.py
    - Create model Person
    - Alter index_together for person (1 constraint(s))

三、查看目标SQL：

python3 manage.py sqlmigrate polls 0001
BEGIN;
--
-- Create model Person
--
CREATE TABLE "polls_person" ("id" integer NOT NULL PRIMARY KEY AUTOINCREMENT, "first_name" varchar(100) NOT NULL, "last_name" varchar(100) NOT NULL);
--
-- Alter index_together for person (1 constraint(s))
--
CREATE INDEX "polls_person_first_name_last_name_0c87f2f4_idx" ON "polls_person" ("first_name", "last_name");
COMMIT;