Expressions

Expressions in DCWorkflow are TALES expressions. See TALES Overview for general TALES information. They are used as access guards and for the setting variable values.

[Note: I haven't figured out what all these contexts actually are and what you can use them for. Explanations are is welcome!]

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

here

The content object (rather than the workflow object) container -- The content object's container

Several other contexts are also provided:

state_change

A special object containing information about the state change (see below) 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, some of which are duplicates of the above information:

• status is a mapping containing the workflow status. This includes all the variables defined in the variable tab with "store in state" checked.
• object is the object being modified by workflow. (Same as the here variable above.)
• workflow is the workflow definition object. (Same as the workflow variable above.)
• transition is the transition object being executed. (Same as the transition variable above.)
• old_state is the former state object. The name of the former state, for example "published", is available as old_state.getId(). (Note that DCWorkflow defines state and status as different entities; the name of the current state is stored in the status. The word clash is unfortunate; patches welcome.)
• new_state is the destination state object. Use new_state.getId() to access the new state name.
• 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.