Couchdbkit provides you a full featured and easy client to access and manage CouchDB. It allows you to manage a CouchDBserver, databases, doc managements and view access. All objects mostly reflect python objects for convenience. Server and Databases objects could be used for example as easy as using a dict.
Couchdbkit requires Python 2.x superior to 2.6.
To install couchdbkit using pip you must make sure you have a recent version of distribute installed:
$ curl -O http://python-distribute.org/distribute_setup.py
$ sudo python distribute_setup.py
$ easy_install pip
To install or upgrade to the latest released version of couchdbkit:
$ pip install couchdbkit
This tutorial exposes key features of this library mainly through code examples. For in-depth description of the modules, you'll want to read the API documentation.
from couchdbkit import Server
# server object
server = Server()
# create database
db = server.get_or_create_db("greeting")
doc = {"mydoc": "test"}
db.save_doc(doc)
import datetime
from couchdbkit import *
class Greeting(Document):
author = StringProperty()
content = StringProperty()
date = DateTimeProperty()
Here is the code to save a greet on Greeting
database. We also see how to create a database:
from couchdbkit import Server
# associate Greeting to the db
Greeting.set_db(db)
# create a new greet
greet = Greeting(
author="Benoit",
content="Welcome to couchdbkit world",
date=datetime.datetime.utcnow()
)
# save it
greet.save()
Note
You can just use the db object to save a Schema: db.save(greet)
.
Your document greet
is now in the greetings
db. Each document is saved with a doc_type
field that allow you to find easily each kind of document with the views. By default doc_type
is the name of the class.
Now that you saved your document, you can update it:
greet.author = u"Benoit Chesneau"
greet.save()
Here we updated the author name.
Mmm ok, but isn't CouchDB storing documents schema less? Do you want to add a property ? Easy:
greet.homepage = "http://www.e-engura.org"
greet.save()
Now you have just added an homepage property to the document.
You first have to create a view and save it in the db. We will call it greeting/all
. To do this we will use the loader system of couchdbkit that allows you to send views to CouchDB.
Let's create a folder that contains the design doc, and then the folder for the view. On unix:
mkdir -p ~/Work/couchdbkit/example/_design/greeting/views/all
In this folder we edit a file `map.js`:
function(doc) {
if (doc.doc_type == "Greeting")
emit(doc._id, doc);
}
}
Here is a folder structure:
/Work/couchdbkit/example/:
--_design/
---- greetings
------ view
Here is a screenshot:
A system will be provided to manage view creation and other things. As some noticed, this system works like couchapp and is fully compatible.
Then we use push function to send the design document to CouchDB:
from couchdbkit.designer import push
push('/path/to/example/_design/greetings', db)
The design doc is now in the greetings
database and you can get all greets:
greets = Greeting.view('greeting/all')