django.db.utils.ProgrammingError：类型“raster”不存在

我的模型：我在这里创建了 3 个模型，当我迁移时，我收到错误。

from django.contrib.gis.db import models

from django.contrib.gis.db.models.fields import RasterField

class WorldBorder(models.Model):
    # Regular Django fields corresponding to the attributes in the
    # world borders shapefile.
    name = models.CharField(max_length=50)
    area = models.IntegerField()
    pop2005 = models.IntegerField('Population 2005')
    fips = models.CharField('FIPS Code', max_length=2)
    iso2 = models.CharField('2 Digit ISO', max_length=2)
    iso3 = models.CharField('3 Digit ISO', max_length=3)
    un = models.IntegerField('United Nations Code')
    region = models.IntegerField('Region Code')
    subregion = models.IntegerField('Sub-Region Code')
    lon = models.FloatField()
    lat = models.FloatField()

    # GeoDjango-specific: a geometry field (MultiPolygonField)
    mpoly = models.MultiPolygonField()

    # Returns the string representation of the model.
    def __str__(self):
        return self.name

class Zipcode(models.Model):
    code = models.CharField(max_length=5) 
    poly= models.PolygonField()

class Elevation(models.Model):
    name = models.CharField(max_length=100,blank=True, null=True)
    rast = RasterField(srid=2346)  

我的设置..我使用的数据库是Postgres，这样我就可以将postgis用于geodjango

DATABASES = {
"default": {
    "ENGINE": "django.contrib.gis.db.backends.postgis",
    "NAME": "django_course",
    "USER": "postgres",
    "PASSWORD": "**************",
    "HOST": "localhost",
    "PORT": "5432",
}
}

你错过了PostGIS Raster https://info.crunchydata.com/blog/waiting-for-postgis-3-separate-raster-extension扩大。创建扩展并重试：

CREATE EXTENSION postgis_raster;

引用自documentation https://postgis.net/2019/10/20/postgis-3.0.0/:

请注意，3.0 中的一个主要变化是栅格功能已 被分解为单独的分机.