plume 0.1.0

Easy webapps with falcon & mongodb

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Plume
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A library to help you make Falcon web apps backed by MongoDB.

Features
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- Simple interface to MongoDB using ``marshmallow`` schemas. This allows a single document
definition which also provides serialization and validation

- Standard ``Resource`` classes for creating a full CRUD JSON API for REST collections and items.

- Easy filtering/projection of documents per request

- The ``FileCollection`` and ``FileItem`` resources provide file upload functionality. They can be configured
to use plumes' basic ``FileStore`` or your own storage backend (e.g. GridFS)

- Useful extra fields for marshmallow (``Choice``, ``Slug``, ``MongoId``, ``Password``...)


Example
--------

The following example creates a basic JSON API for a representation of a user.

.. code-block:: python

from datetime import datetime
from plume import create_app, schema, Collection, Item
from plume.connection import connect
from plume.fields import Slug
from marshmallow import fields, Schema

class UserSchema(schema.MongoSchema):
name = fields.Str(required=True)
email = fields.Email(required=True)
created = fields.DateTime(
missing=lambda: datetime.utcnow().isoformat(),
default=lambda: datetime.utcnow().isoformat()
)
profile = fields.Nested("ProfileSchema")
slug = Slug(populate_from='name')

class ProfileSchema(Schema):
"""Example of nesting a schema.
In mongodb, this will be a nested document
"""
biography = fields.Str()
profile_image = fields.Url(load_from='profileImage', dump_to='profileImage')


def get_app(database_name='myapp')
"""Creates the falcon app.
We pass the database name so we can use a different db for testing
"""
# Connect to the database *before* making schema instance.
# The ``connect`` function takes the same arguments as pymongo's
# ``MongoClient``. Here we connect to localhost.
connect(database_name)
user = UserSchema()
resources = (Collection(user, '/users'), Item(user, '/users/{email}'))
return create_app(resources)

Name this file ``app.py`` and run it with gunicorn:

gunicorn 'app:get_app()'

Design
----------

Plume intends to be a light and transparent library. It should compliment and enhance
Falcon & MongoDB usage but not get in the way of custom development.
To this end I have a small number of rules:

- No magic. Like falcon itself, it should be easy to follow inputs to outputs. To this end we have
a few soft rules such as:
- Avoid mixins. Mixins introduce implicit dependencies and make it harder to reason about code.
- Don't mess with metaclasses and double underscore methods without good reason.
There is often an easier, clearer way to achieve the same result.

- No reinvention. We try to use well proven existing solutions before rolling our own. Hence the use
of ``marshmallow`` for the ORM/serialization framework.

- No hijacking. Plume is complimentary or an 'add-on' to Falcon. It does not replace direct usage of Falcon (what
you might expect from a framework). It solves some common use cases and provides some useful tools. When you want to
do something unsupported and go direct to falcon, it doesnt get in your way.






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History
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0.1.0 (2017-09-25)
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* First release on PyPI.