Class traced_selection

source code

object --+
         |
        traced_selection

Typical usage is :

.. sourcecode:: python

    >>> from logilab.common.registry import traced_selection
    >>> with traced_selection():
    ...     # some code in which you want to debug selectors
    ...     # for all objects

This will yield lines like this in the logs::

    selector one_line_rset returned 0 for <class 'elephant.Babar'>

You can also give to :class:`traced_selection` the identifiers of objects on
which you want to debug selection ('oid1' and 'oid2' in the example above).

.. sourcecode:: python

    >>> with traced_selection( ('regid1', 'regid2') ):
    ...     # some code in which you want to debug selectors
    ...     # for objects with __regid__ 'regid1' and 'regid2'

A potentially useful point to set up such a tracing function is
the `logilab.common.registry.Registry.select` method body.