django.db.utils.ProgrammingError：数据类型字符变化没有访问方法“gin”的默认运算符类

Question

我正在开发一个 django 项目，我想在模型的属性上创建 gin 索引。我想创建杜松子酒索引

 SchoolName = models.CharField(max_length=200, blank=False, null=False)

但是，我收到这个错误

 django.db.utils.ProgrammingError: data type character varying has no default operator class for access method "gin"

帮我找出这个错误

Answer 1

创建一个迁移文件来安装，BtreeGinExtension以便能够在varchar数据类型上构建 GIN 索引。

from django.contrib.postgres.operations import BtreeGinExtension

class Migration(migrations.Migration):
    ...

    operations = [
        BtreeGinExtension(),
        ...
    ]

参考：

• https://www.postgresql.org/docs/current/static/gin-builtin-opclasses.html
• https://docs.djangoproject.com/en/2.0/ref/contrib/postgres/indexes/#ginindex
• https://docs.djangoproject.com/en/2.0/ref/contrib/postgres/operations/