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Project description
PG NoSQL
Using Postgres as a NoSQL database. Intended for providing a shared storage space between different django projects
Installation
pip install dj-pgnosql
Note: this package doesn't specify any requirements, but assumes that your project is setup to use Postgres with a version of Django that supports JSONField
- Add
pgnosql
toINSTALLED_APPS
in settings.py
Recommended usage (with a custom database)
We recommend that you configure pgnosql to use a different database from your project's default database.
The idea is that you might have multiple django projects which connect to this KV store as a means to easily share data between services
Configure a seperate database connection:
settings.py
DATABASES = {
'default': {
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': os.environ.get('DATABASE_NAME', 'postgres'),
'USER': os.environ.get('DATABASE_USER', 'postgres'),
'HOST': os.environ.get('DATABASE_HOST', 'postgres'),
'PORT': 5432,
},
'pgnosql': { # <- this is our nosql db
'ENGINE': 'django.db.backends.postgresql_psycopg2',
'NAME': os.environ.get('NOSQL_DATABASE_NAME', 'postgres'),
'USER': os.environ.get('NOSQL_DATABASE_USER', 'postgres'),
'HOST': os.environ.get('DATABASE_HOST', 'postgres'),
'PORT': 5432,
}
}
Add the DB router
DATABASE_ROUTERS = ['pgnosql.routers.NoSQLRouter']
This router will send queries to the NoSQL database if the model is from the pgnosql
app. Otherwise will send it to the default database
Run migrations:
You'll need to specify that you're running them for the pgnosql
database.
web python manage.py migrate pgnosql --database=pgnosql
You're all setup.
Usage
from pgnosql.models import KV
key = "foo"
value = {"bar": "bus"}
KV.set(key, value) # value must be json
KV.get(key) # {"bar": "bus"}
KV.delete()
You can obviously also just use Django's standard ORM
Model fields:
key = models.CharField(max_length=100, db_index=True)
value = JSONField(default=dict)
index = models.CharField(max_length=255, db_index=True, help_text='You can provide an index to make this key searchable')
time_to_live = models.PositiveIntegerField(default=0)
created_date = models.DateTimeField(auto_now_add=True)
modified_date = models.DateTimeField(auto_now=True)
Sub-modules
dj=pgnosql
supplies a few sub-modules for dealing with Specific use-cases
GlobalUser
A shared user object
# Get a user
from pgnosql.user import GlobalUser
user_id = 1
user = GlobalUser(user_id)
# set arbitary data on a user:
user_data = {"foo": "bar"}
user.set(user_data)
user.get()
>> {"foo": "bar"}
Feed
TBD
Metrics
TBD
Notes on versioning:
x.y.z
| | |__ Patch
| |____ Minor
|______ Major
- Patch: tweaks, improvements and bug fixes - backward compatible. Inclides new functionality in the API interface - but not changes to to it
- Minor: Changes to the existing API interface
- Major: Changes to db schema/Django models
Development
Testing
With docker (recommended)
docker-compose run --rm web python manage.py test
Generate Spec Docs:
docker-compose run --rm web python manage.py test --testrunner=testreporter.runner.BDDTestRunner
See spec.txt
FAQ
Why not use something like Redis or Mongo?
Our main motivation for building this library is due to the strong support for Postgres in Django. In most cases - if you're already using Django - you'll be able to use this library with no extra dependencies.
You also get all of Django's built in support for Postgress including:
- Easy to test
- Configuration baked in
- You're probably already using Postgres for your normal models. Now you don't need to add another piece of machinery
- Django Admin support
- Django ORM support
- ...
Project details
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