[migration] Fix addition of entity type including boundary constraints on its own attributes This was failing because of the sequence of sql executing when adding an attribute: 1. add entity type <commit> 2. add relation type for attribute 1 <commit> 3. add attribute 1 and associated constraints <commit> etc. In the case of e.g. start/end constraint, we were trying to add the constraint before addition of the constrained attribute (e.g. add constraint on 'start' referencing 'end', but only 'start' has been added yet, not 'end'). This patch fix this by: * adding the relation type to the schema without having to commit, but keeping the operation to revert the addition if necessary - this allows to a single commit for all attributes of the entity type ; * using a LateOperation on constraint operation, so we ensure attributes are actually added before any constraint is added.

CubicWeb semantic web framework
===============================

CubicWeb is a entities / relations based knowledge management system
developped at Logilab.

This package contains:

- a repository server
- a RQL command line client to the repository
- an adaptative modpython interface to the server
- a bunch of other management tools

Install
-------

More details at https://docs.cubicweb.org/book/admin/setup

Getting started
---------------

Execute::

 apt-get install cubicweb cubicweb-dev cubicweb-blog
 cubicweb-ctl create blog myblog
 cubicweb-ctl start -D myblog
 sensible-browser http://localhost:8080/

Details at https://docs.cubicweb.org/tutorials/base/blog-in-five-minutes

Documentation
-------------

Look in the doc/ subdirectory or read https://docs.cubicweb.org/


CubicWeb includes the Entypo pictograms by Daniel Bruce — www.entypo.com