redis-schematics 0.1.0

Redis storage backend for schematics.

Provides Redis persistence to Schematics models with cutomizable abstraction levels.

Installing

Using pip:

pip install redis_schamatics

Quickstart

Currently we only support a SimpleRedisMixin.

Creating models with persistence

Note: you should include a pk, but don’t bother setting it’s value manually. We can infer it from an id field or by setting a tuple of field names using __unique_together__.

from datetime import datetime, timedelta

from redis import StrictRedis
from redis_schematics import SimpleRedisMixin
from schematics import models, types


class IceCreamModel(models.Model, SimpleRedisMixin):
    pk = types.StringType()  # Just include a pk
    id = types.StringType()
    flavour = types.StringType()
    amount_kg = types.IntType()
    best_before = types.DateTimeType()

Setting on Redis

Saving is simple as set().

 vanilla = IceCreamModel(dict(
     id='vanilla',
     flavour='Sweet Vanilla',
     amount_kg=42,
     best_before=datetime.now() + timedelta(days=2),
 ))

chocolate = IceCreamModel(dict(
     id='chocolate',
     flavour='Delicious Chocolate',
     amount_kg=12,
     best_before=datetime.now() + timedelta(days=3),
 ))

 vanilla.set()
 chocolate.set()

Getting from Redis

There are two basic ways to get an element from Redis: by pk or by value. You can use the classmethods match_for_pk(pk) or match_for_values(**Kwargs) or just simply match(**kwargs) to let us choose which one. Notice that the performance from both methods is a lot different, so you may avoid matching for values on high performance environments.

IceCreamModel.match_for_pk('vanilla')
IceCreamModel.match_for_values(amount__gte=30)

IceCreamModel.match(id='vanilla')  # match on pk
IceCreamModel.match(best_before__gte=datetime.now())  # match on values

Fetching all and filtering

You can also use all() to deserialize all and filters. Notice that this invlolves deserializing all stored objects.

IceCreamModel.all()
IceCreamModel.filter(amount__gte=30)

Roadmap

• [ ] Support a distributed Mixin with one key per field.

• [ ] Consistent set of unit tests.

• [ ] Support redis relationships between models.

• [ ] Support transaction aware methods.