These are just some notes on what issues I have found in the exchange interface between nbgrader and the database. It could at some point be split into individual issues.
Desync issues:
The interface does not check whether files exist on the local notebook when querying the exchange
This can lead to situations where an assignment shows as downloaded even when it is not (anymore), which makes it impossible redownload
This can happen due to the user deleting an assignment, or if the assignment directory is change in the configuration
External issue: #14
Paths
The handling of paths is inconsistent. This is in part due to inheriting path handling from nbgrader (which has a similar problem) and in part with the changes made to interface with the external exchange.
While it works for now, any changes to the configuration of paths might break the application (this is also true in nbgrader)
External issue: #24
Checking for negative cases
There are some improvements to be made, both in the plugin and the exchange tornado server to handle cases where something has gone wrong.
These are just some notes on what issues I have found in the exchange interface between nbgrader and the database. It could at some point be split into individual issues.