django.db.utils.ProgrammingError: type "raster" does not exist

Question

我的模型：我在这里创建了 3 个模型，当我迁移时出现错误。

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",
}
}

Answer 1

在您的数据库设置中使用它

DATABASES = {
'default': {
    'ENGINE': 'django.db.backends.postgresql_psycopg2',
    'NAME': 'database_name',
    'HOST': 'localhost',
    'USER': 'user_name',
    'PASSWORD': 'password',
    'PORT': '5432',
    }
}

Answer 2

您缺少 PostGIS Raster 扩展名。创建扩展并重试：

CREATE EXTENSION postgis_raster;

引自documentation：

Note that a major change in 3.0 is that the raster functionality has been broken out as a separate extension.

Answer 3

将这两行添加到您的迁移文件中elevation_zipcode.py:

from django.contrib.postgres.operations import CreateExtension

operations = [
        CreateExtension('postgis_raster'),

django.db.utils.ProgrammingError: type "raster" does not exist

django.db.utils.ProgrammingError: type "raster" does not exist

django

postgresql

postgis

geodjango

postgis-raster