CVEI I

Because the order of the above technique of (1) collecting, (2) validating and (3) extract-if-valid is so common, they are provided as keywords you can use in-place of a hard-coded number.

import pyblish.api
disk = {}
items = ["JOHN.person", "door.prop"]
class CollectInstances(pyblish.api.ContextPlugin):
order = pyblish.api.CollectorOrder # <-- This is new
def process(self, context):
for item in items:
name, suffix = item.split(".")
context.create_instance(name, family=suffix)
class ValidateNamingConvention(pyblish.api.InstancePlugin):
order = pyblish.api.ValidatorOrder
def process(self, instance):
name = instance.data["name"]
assert name == name.title(), "Sorry, %s should have been %s" % (
name, name.title())
class ExtractInstances(pyblish.api.InstancePlugin):
order = pyblish.api.ExtractorOrder
def process(self, instance):
disk[instance.data["name"]] = instance
pyblish.api.register_plugin(CollectInstances)
pyblish.api.register_plugin(ValidateNamingConvention)
pyblish.api.register_plugin(ExtractInstances)
import pyblish.util
pyblish.util.publish()
# Sorry, JOHN should have been John
# Sorry, door should have been Door

Notice that instead of picking a number at random, we instead utilised the built-in order of CVEI. This not only simplifies determining the role of each plug-in, it also allows Pyblish to make some basic assumptions about your plug-ins, such as when to stop.

These constants are nothing more than integer numbers.

CollectorOrder: 0
ValidatorOrder: 1
ExtractorOrder: 2

Together, they form the first three letters of "CVEI". We'll look at the last letter next.