AttributeError: 'Environment' object has no attribute 'get_db_cnx'

[Justin Ludwig]

When reordering items in a queue with Trac 1.2 and QueuesPlugin 0.2.0, xhr requests to the queuesajax/update handler return a 500 error with the following message:

Oops...
Traceback (most recent call last):
  File "build/bdist.linux-x86_64/egg/queues/web_ui.py", line 135, in process_request
    self._save_changes(changes, req.authname)
  File "build/bdist.linux-x86_64/egg/queues/web_ui.py", line 177, in _save_changes
    db = self.env.get_db_cnx()
AttributeError: 'Environment' object has no attribute 'get_db_cnx'

The same error is shown in a browser alert, and the page reloads without changes being saved.

[Justin Ludwig]

The attached ticket12934-2016-11-07.patch contains a fix for this, replacing the old env.get_db_cnx API with the new env.db_transaction API.

[Ryan J Ollos]

In 15978:

1.2.0dev: Adapt to Trac 1.0+ database API

• Create a new branch for Trac 1.2 and later.
• Drop compatibility code for Trac < 1.2

Patch by justinludwig.

Fixes #12934.