Master branch:
Look at redisca2 for new features. This version will receive bug fixes only.
Using PyPi (recommended):
sudo pip install redisca
or
wget https://pypi.python.org/packages/source/r/redisca/redisca-X.tar.gz tar xvf redisca-X.tar.gz sudo python redisca-X/setup.py install
from redisca import Model
from redisca import Email
from redisca import DateTime
class User (Model):
email = Email(
field='eml', # Define link with 'eml' hash key.
index=True, # Index support.
unique=True, # Makes sure that field is unique across db.
)
created = DateTime(
field='created', # Define link with 'created' hash key.
new=datetime.utcnow, # Value which is used as default in User.new()
)
age = Integer(
field='age', # Define link with 'age' hash key.
index=True, # Enable index.
)
user = User.new() # Create model with random id and "new" fields values.
user = User.new(model_id='your_id') # Or use custom id if needed.
user.getid() # user id
user.email = '[email protected]'
user.save() # Saving routines
user.exists() # True
user.delete() # Deletion routines
user.exists() # FalseField is the way how you should control data in your models. Just define class variables with field-specific options and take classic ORM's advantages:
- data validation;
- native python data types support;
- transparent relations between models;
- indexes support (incl. unique indexes).
Available parameters:
- field - redis hash field name to store value in.
- index - makes field searchable.
- unique - tells that value should be unique across database. Model.save() will raise an Exception if model of same class already exists with given value.
- new - field value which is used as default in Model.new(). Functions, methods and built-in's are acceptable as callback values.
Built-in fields:
- String - extends IndexField with additional parameters minlen and maxlen.
- Email - extends IndexField field with email validation support.
- Integer - extends RangeIndexField with parameters minval and maxval. Accepts int and numeric strings. Returns int.
- Reference - extends IndexField with cls (reference class) parameter. Accepts and returns instance of cls.
- MD5Pass - extends String field. Acts like string but converts given string to md5 sum.
- DateTime - extends RangeIndexField without additional parameters. Accepts datetime and int(timestamp) values. Returns datetime.
Here is an example how to get model instance using id (empty model returned if it not exists yet):
user = User('user id')
print(user.email) # '[email protected]'Each initialized model is saved in registry and returned on each attempt of re-init:
user1 = User('user_id')
user2 = User('user_id')
user1 is user2 # Always is True
user.free() # Unregister model instance.
User.free_all() # Cleanup User's registry.
Model.free_all() # Unregister all known models.users = User.email == '[email protected]' # or User.email.find('[email protected]')Subclasses of RangeIndexField has a limited support for ranged queries:
users = User.age >= 10 # User.age.range(minval=10)More complex queries are also possible:
# SELECT * FROM `users` where `age` BETWEEN 0 AND 100 LIMIT 10 OFFSET 50;
users = User.age.range(minval=0, maxval=100, start=50, num=10)All fields are linked to model dict keys. Use can use model dict API to read and write redis hash data AS IS:
user = User('id')
user['eml'] = '[email protected]'
user['age'] = 10Global database connection setup looks like this:
from redisca import conf
from redis import Redis
conf.db = Redis()Note: redisca uses localhost:6379(0) as default database. You can setup inheritable per-model database connection using conf class decorator:
from redisca import Model
from redisca import conf
from redis import Redis
@conf(db=Redis())
class User (Model):
passModel key format is:
model_key_prefix:model_id
Default model_key_prefix is lowercased class name. Use conf class decorator to override it like this:
from redisca import Model
from redisca import conf
@conf(prefix='usr')
class User (Model):
pass
print(User.getprefix()) # 'usr'
print(user.getkey()) # 'usr:1'from redisca import hexid
from redisca import intid
print(hexid()) # 59d369790
print(hexid()) # 59d3697bc
print(intid()) # 24116751882
print(intid()) # 24116788848from redisca import FlaskRedisca
app = Flask()
app.config['REDISCA'] = {
# redis.StrictRedis constructor kwargs dict.
}
FlaskRedisca(app)Optional autosave constructor parameter tells redisca that all known models should be saved at the end of request (if no exception raised). Unchanged and deleted instances are ignored. If you want to skip locally changed instances use free() method during request life.
- redis-py 2.7+
- python 2.7/3.2+ or pypy 2.1+
Py3k support is still a sort of experiment but I'm looking carefuly into full compability with cutting-edge builds of CPython. There are no known issues with it actually.
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