如何在现有模型上激活不重要的扩展名 [英] How can I activate the unaccent extension on an already existing model
问题描述
当我尝试安装 unaccent
Postgres扩展名(通过 postgresql-contrib
软件包)时,一切正常每个以下内容:
When I try to install the unaccent
Postgres extension (through the postgresql-contrib
package), everything works as per the below:
# psql -U postgres -W -h localhost
Password for user postgres:
psql (9.3.9)
SSL connection (cipher: DHE-RSA-AES256-GCM-SHA384, bits: 256)
Type "help" for help.
postgres=# CREATE EXTENSION unaccent;
CREATE EXTENSION
postgres=# SELECT unaccent('Hélène');
unaccent
----------
Helene
(1 row)
但是,当我尝试使用Django 1.8时,出现以下错误:
However, when I try to use with Django 1.8, I get following error:
ProgrammingError: function unaccent(character varying) does not exist
LINE 1: ...able" WHERE ("my_table"."live" = true AND UNACCENT("...
^
HINT: No function matches the given name and argument types. You might need to add explicit type casts.
使用Postgresql 9.3和Django 1.8。
Using Postgresql 9.3 and Django 1.8.
推荐答案
需要手动制作和应用迁移文件。
A migration file needs to be manually made and applied.
首先,创建一个空迁移:
First, create an empty migration:
./manage.py makemigrations myapp --empty
然后打开文件并将 UnaccentExtension
添加到操作
:
Then open the file and add UnaccentExtension
to operations
:
from django.contrib.postgres.operations import UnaccentExtension
class Migration(migrations.Migration):
dependencies = [
(<snip>)
]
operations = [
UnaccentExtension()
]
现在使用 ./ manage.py migration
来应用迁移。
如果在最后一步中出现以下错误:
If you'd get following error during that last step:
django.db.utils.ProgrammingError: permission denied to create extension "unaccent"
HINT: Must be superuser to create this extension.
...然后通过执行 postgres#临时为您的用户授予超级用户权限ALTER ROLE<用户名> SUPERUSER;
及其对应的 NOSUPERUSER
。 pgAdminIII也可以做到这一点。
... then temporarily allow superuser rights to your user by performing postgres# ALTER ROLE <user_name> SUPERUSER;
and its NOSUPERUSER
counterpart. pgAdminIII can do this, too.
现在可以使用Django享受令人赞叹的功能:
Now enjoy the unaccent functionality using Django:
>>> Person.objects.filter(first_name__unaccent=u"Helène")
[<Person: Michels Hélène>]
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