CubicWeb - The Semantic Web is a construction game!#


Starting from CubicWeb version 4.0 all code related to generating html views has been moved to the Cube cubicweb_web.

If you want to migrate a project from 3.38 to 4.* while still using all the html views you need to both install the cubicweb_web cube AND add it to your dependencies and run add_cube('web').

cubicweb_web can be installed from pypi this way:

pip install cubicweb_web

We don’t plan to maintain the features in cubicweb_web in the long run; we are moving to a full javascript frontend using both cubicweb_api (which exposes a HTTP API) and @cubicweb/client as a frontend javascript toolkit.

In the long run cubicweb_api will be merged inside of CubicWeb.

CubicWeb is a semantic web application framework, licensed under the LGPL, empowering developers to efficiently build web applications by reusing components (called cubes) and following the well known object-oriented design principles.

Main Features#

  • an engine driven by the explicit data model of the application,

  • a query language named RQL similar to W3C’s SPARQL,

  • a selection+view mechanism for semi-automatic XHTML/XML/JSON/text generation,

  • a library of reusable components (data model and views) that fulfill common needs,

  • the power and flexibility of the Python programming language,

  • the reliability of SQL databases, LDAP directories and Mercurial for storage backends.

Created in early 2000s from an R&D effort and still maintained, supporting 100,000s of daily visits at some production sites, CubicWeb is a proven end to end solution for semantic web application development promoting quality, reusability and efficiency.

First steps#

Cubicweb core principle#


CubicWeb offers two different ways of routing : one internal to CubicWeb and a one with the pyramid framework.

  • Principle:

    • cubicweb and pyramid

    • the CW request object

    • the pyramid request object

    • encapsulation of the CW request in the pyramid request

    • bw_compat and the options to use, fallback when CW doesn’t find anything

  • CubicWeb routing:

  • Pyramid routing:

    • general principles

    • predicates

    • tweens

    • content negociation

Front development#

  • With Javascript / Typescript (using React):

    • general principle

    • how to install and integrate js tooling into CW

    • cwelements

    • rql browser

  • With Pyramid:

  • With CubicWeb Views:

  • RDF:

    • the RDF adaptator

    • RDFLib integration into CW

Data model and management#


Migrate your schema#

Each time the schema is updated, two action are needed : update the underlying tables and update the corresponding data.

Cubicweb configuration files#

Common Web application tools#


  • Command line tool:

  • Performances:

  • Debugging:

    • Command line options for debugging

    • Debugging configuration directly in the code

    • Pyramid debug toolbar

    • Debug channels

  • Good practices:

    • tox

    • check-manifest

    • mypy

    • flake8 et black

  • CI:

    • Gitlab-ci integration

System administration#

CubicWeb’s ecosystem#

CubicWeb is based on different libraries, in which you may be interested:

How to contribute#


  • Chat on the matrix room

  • Weekly video meeting every Tuesday at 2PM (Europe/Paris). The link is shared in the matrix room

  • Discover on the blog

  • Contribute on the forge

  • Find published python modules on pypi

  • Find published npm modules on npm

  • Changelog