class Stop(models.Model):
idn = models.PositiveIntegerField(primary_key=True, unique=True)
label = models.CharField(null=False, blank=False, max_length=512)
coor_x = models.FloatField()
coor_y = models.FloatField()
buses = models.ManyToManyField(Bus)
latest_query_datetime = models.DateTimeField(default=datetime(2000, 1, 1, 0, 0, 0))
latest_query_data = JSONField(default={})
class Meta:
ordering = ["label"]
def __str__(self):
return self.label
当我跑步时：
python3 manage.py makemigrations && python3 manage.py migrate
它引发ProgrammingError说jsonb数据类型不存在：
Migrations for 'rest':
0007_auto_20160612_1301.py:
- Alter field latest_query_data on stop
Operations to perform:
Apply all migrations: contenttypes, rest, auth, sessions, admin
Running migrations:
Rendering model states... DONE
Applying rest.0005_auto_20160612_1237...Traceback (most recent call last):
File "/home/erayerdin/.venv/eshot-api/lib/python3.5/site-packages/django/db/backends/utils.py", line 64, in execute
return self.cursor.execute(sql, params)
psycopg2.ProgrammingError: type "jsonb" does not exist
LINE 1: ... TABLE "rest_stop" ADD COLUMN "latest_query_data" jsonb DEFA...
^
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "manage.py", line 10, in <module>
execute_from_command_line(sys.argv)
File "/home/erayerdin/.venv/eshot-api/lib/python3.5/site-packages/django/core/management/__init__.py", line 353, in execute_from_command_line
utility.execute()
File "/home/erayerdin/.venv/eshot-api/lib/python3.5/site-packages/django/core/management/__init__.py", line 345, in execute
self.fetch_command(subcommand).run_from_argv(self.argv)
File "/home/erayerdin/.venv/eshot-api/lib/python3.5/site-packages/django/core/management/base.py", line 348, in run_from_argv
self.execute(*args, **cmd_options)
File "/home/erayerdin/.venv/eshot-api/lib/python3.5/site-packages/django/core/management/base.py", line 399, in execute
output = self.handle(*args, **options)
File "/home/erayerdin/.venv/eshot-api/lib/python3.5/site-packages/django/core/management/commands/migrate.py", line 200, in handle
executor.migrate(targets, plan, fake=fake, fake_initial=fake_initial)
File "/home/erayerdin/.venv/eshot-api/lib/python3.5/site-packages/django/db/migrations/executor.py", line 92, in migrate
self._migrate_all_forwards(plan, full_plan, fake=fake, fake_initial=fake_initial)
File "/home/erayerdin/.venv/eshot-api/lib/python3.5/site-packages/django/db/migrations/executor.py", line 121, in _migrate_all_forwards
state = self.apply_migration(state, migration, fake=fake, fake_initial=fake_initial)
File "/home/erayerdin/.venv/eshot-api/lib/python3.5/site-packages/django/db/migrations/executor.py", line 198, in apply_migration
state = migration.apply(state, schema_editor)
File "/home/erayerdin/.venv/eshot-api/lib/python3.5/site-packages/django/db/migrations/migration.py", line 123, in apply
operation.database_forwards(self.app_label, schema_editor, old_state, project_state)
File "/home/erayerdin/.venv/eshot-api/lib/python3.5/site-packages/django/db/migrations/operations/fields.py", line 62, in database_forwards
field,
File "/home/erayerdin/.venv/eshot-api/lib/python3.5/site-packages/django/db/backends/base/schema.py", line 396, in add_field
self.execute(sql, params)
File "/home/erayerdin/.venv/eshot-api/lib/python3.5/site-packages/django/db/backends/base/schema.py", line 110, in execute
cursor.execute(sql, params)
File "/home/erayerdin/.venv/eshot-api/lib/python3.5/site-packages/django/db/backends/utils.py", line 79, in execute
return super(CursorDebugWrapper, self).execute(sql, params)
File "/home/erayerdin/.venv/eshot-api/lib/python3.5/site-packages/django/db/backends/utils.py", line 64, in execute
return self.cursor.execute(sql, params)
File "/home/erayerdin/.venv/eshot-api/lib/python3.5/site-packages/django/db/utils.py", line 95, in __exit__
six.reraise(dj_exc_type, dj_exc_value, traceback)
File "/home/erayerdin/.venv/eshot-api/lib/python3.5/site-packages/django/utils/six.py", line 685, in reraise
raise value.with_traceback(tb)
File "/home/erayerdin/.venv/eshot-api/lib/python3.5/site-packages/django/db/backends/utils.py", line 64, in execute
return self.cursor.execute(sql, params)
django.db.utils.ProgrammingError: type "jsonb" does not exist
LINE 1: ... TABLE "rest_stop" ADD COLUMN "latest_query_data" jsonb DEFA...
我使用PostgreSQL来使用JSONField并在用户请求视图时更新它。如果我不使用default={}，它会告诉我制作一个。
我将latest_query_data字段更改为TextField，以便我可以存储为字符串并在需要时转换为dict。但是，这也引起了同样的错误。
答案 0 :(得分：14)
根据Django文档，JSONField要求PostgreSQL≥9.4且Psycopg2≥2.5.4
您使用的是什么PostgreSQL版本？
Ubuntu 14.04存储库仅包含9.3版本。您可以查看this以升级您的版本。
答案 1 :(得分：1)
如果您收到此错误并且已安装Postgres＆gt; 9.4然后我会检查你是否连接到你的实例上也安装的旧版Postgres。
要确认您从Django连接的是什么，您可以使用shell中的 psycopg2 ：
import psycopg2
conn = psycopg2.connect("dbname=<your database> user=<your user> password=<your password>")
cur = conn.cursor()
cur.execute("SELECT Version();")
cur.fetchone()
确保此处的版本为＆gt; 9.4。如果没有，您可能安装了几个版本，并且您的服务配置指向另一个版本。
答案 2 :(得分：0)
对于旧版PostgreSQL，例如“ PostgreSQL9.2.x”，
我们可以使用替代方式
from jsonfield import JSONField
代替：
from django.contrib.postgres.fields import JSONField
例如：
from django.db import models
from jsonfield import JSONField
class MyModel(models.Model):
json = JSONField()
可以安装为：
pip install jsonfield
检查一下： Add support for PostgreSQL 9.2+'s native json type. #32
此解决方案特别适用于某些限量版。例如， 默认情况下支持postgresql9.2的VPS和Cpanel上
更多详细信息！，see"rpkilby-jsonfield"
答案 3 :(得分：-3)
所以，它似乎是psycopg2或django上的一个错误，我将在两个存储库上发布一个问题。这就是我解决问题的方法（至少ProgrammingError）。
JSONField更改为TextField。刷新数据库。
小心！此操作将清除数据库中的所有数据，但
结构。
删除所有应用中的所有migrations文件夹。
python3 manage.py makemigrations && python3 manage.py migrate。python manage.py makemigrations <appname> && python3 manage.py migrate <appname>。json模块在str和dict之间进行转换。但是，请记住，如果要过滤模型的QuerySet，此解决方案需要付出很多努力。我不推荐它，但没有其他解决方案来摆脱这个错误，我需要做的就是保存数据并代表它。
！如果在48小时内没有出现任何其他更好的解决方案，则此答案将被视为默认答案。