Renaming plugin class doesn't update

pyblish / pyblish-base

Pyblish base library - see https://github.com/pyblish/pyblish for details.

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Renaming plugin class doesn't update #106

Closed tokejepsen closed 9 years ago

tokejepsen commented 10 years ago

Renaming a plugin class in Maya, doesn't change the logging.
Breaking that renamed plugin, give an error in the log.
Renaming the plugin class back to the original, and the error persists.

mottosso commented 9 years ago

Some more info on this.

Running the included example of Pyblish Maya and publishing with ExtractModelAsObj works well. Then renaming it to ExtractModelAsObj2 produces duplicate plug-ins; one by the original name, and one using the old.

This occurs in both logging and the Pyblish QML GUI.

Hunting this down now.

mottosso commented 9 years ago

This looks to be due to a particularity in how the Python import mechanism works and was difficult to test and thus difficult to fix.

Marking this as a minor inconvenience for now.

mottosso commented 9 years ago

Encountered a solution to this on the interwebs just now by chance.

Apparently, the Python import mechanism implicitly "merges" a module with another is another one of the same name is already in sys.modules, which is the case here as the plug-in class changed, but the file did not, resulting in two classes.

The solution was simple (though hacky). Remove it from sys.modules before importing it again.