Attach metadata to any Django models using redis
Project description
Attach metadata to any Django models using redis.
Installation
Either check out the package from GitHub or it pull from a release via PyPI:
pip install django-metadata
Usage
With django-metadata you can attach metadata to any Django models, you will be able to link keys and theirs values to any instances.
Currently only Redis is supported with only redis-py as backend.
Let’s say you have this model:
# models.py
from django.db import models
class User(models.Model):
username = models.CharField(max_length=150)Now you have to attach the MetadataMixin to your model:
# models.py
from django.db import models
from metadata.mixins import MetadataMixin
class User(MetadataMixin, models.Model):
username = models.CharField(max_length=150)You can customize the way django-metadata is storing your values by providing a metadata_key property to your model:
# models.py
from django.db import models
from metadata.mixins import MetadataMixin
class User(MetadataMixin, models.Model):
username = models.CharField(max_length=150)
def metadata_key(self):
return 'metadata:utilisateur:%d' % self.pkBy default, the schema will be metadata:%(lowerclassname)s:%(primary_key)s.
Now we have connected our model to the mixin we can play with the API.
The API of MetadataContainer follows the same principes as dict.
Adding keys
>>> from myapp.models import User
>>> user = User.objects.create(username='thoas')
>>> user.metadata['mail_signup_sent'] = 1
>>> user = User.objects.get(username='thoas')
>>> user.metadata['mail_signup_sent']
1
>>> user.metadata = {'mail_signup_sent': 0}
>>> user.metadata['mail_signup_sent']
0Removing keys
You can either removing a key by setting its value to None or use the del operator.
>>> del user.metadata['key']
>>> user.metadata['key']
Traceback (most recent call last):
...
KeyError: 'key'
>>> user.metadata.get('key', None)
None
>>> user.metadata['foo'] = 'bar'
>>> user.metadata['foo'] = None
>>> user.metadata['foo']
Traceback (most recent call last):
...
KeyError: 'foo'
>>> user.metadata.get('foo', None)
None
>>> user.metadata['key'] = 'value'
>>> user.metadata['foo'] = 'bar'
>>> user.metadata = {'foo': None}
>>> user.metadata['foo']
Traceback (most recent call last):
...
KeyError: 'foo'
>>> user.metadata['key']
valueIterating keys
>>> 'value' in user.metadata
True
>>> user.metadata.values()
['value']
>>> user.metadata.keys()
['key']
>>> user.metadata.items()
[('key', 'value')]Incrementing keys
As we are using Redis as storing engine you can use some of its nice features:
>>> user.metadata.incr('counter')
>>> user.metadata['counter']
1
>>> user.metadata.incr('counter', 2)
>>> user.metadata['counter']
3Inspiration
django-metadata comes from an original idea of twidi.
Download files
Download the file for your platform. If you're not sure which to choose, learn more about installing packages.
Source Distribution
File details
Details for the file django-metadata-0.1.5.tar.gz.
File metadata
- Download URL: django-metadata-0.1.5.tar.gz
- Upload date:
- Size: 7.7 kB
- Tags: Source
- Uploaded using Trusted Publishing? No
File hashes
| Algorithm | Hash digest | |
|---|---|---|
| SHA256 | 7814011ef8e6201553fc9ba37e31b9cdd5fbe5de6520afc0948ab1bd10ec0e1e |
|
| MD5 | 007d0632d19bac25f075010807643b2f |
|
| BLAKE2b-256 | 49ae451f52011b8f38ab92ad2c6a2d8c4b82f215d5b7681d57ce26b4df53de9a |
