Workflow Expressions

by Jon Stahl — last modified Dec 30, 2008 03:05 PM
You can use TALES expressions in workflow definitions.

A workflow expression is a TALES expression. TALES expressions are fully described at:

http://dev.zope.org/Wikis/DevSite/Projects/ZPT/TALES

http://www.zope.org/Documentation/Books/ZopeBook/2_6Edition/AppendixC.stx


Some of the contexts have slightly different meanings from what is provided for expressions in page templates.


    • here: The content object.

    • container: The content object's container


Several other contexts are also provided.

    • state_change: A special object containing info about the state change

    • transition: The transition object being executed

    • status: The former status

    • workflow: The workflow definition object

    • scripts: The scripts in the workflow definition object


state_change objects provide the following attributes:

    • status is a mapping containing the workflow status.

    • object is the object being modified by workflow.

    • workflow is the workflow definition object.

    • transition is the transition object being executed.

    • old_state is the former state object.

    • new_state is the destination state object.

    • kwargs is the keyword arguments passed to the doActionFor() method.

    • getHistory(), a method that returns a copy of the object's workflow history.

    • getPortal(), which returns the root of the portal.

    • ObjectDeleted and ObjectMoved, exceptions that can be raised by scripts to indicate to the workflow that an object has been moved or deleted.

    • getDateTime() is a method that returns the DateTime of the transition.