validate_history.py

# [email protected]
# --------------------
import pyblish.api
from maya import cmds, mel


def _get_has_history():
    invalid = []
    for node in cmds.ls(type='mesh'):
        if len(cmds.listHistory(node)) > 1:
            invalid.append(node)
            continue
    return invalid


class ClearHistoryAction(pyblish.api.Action):
    label = "Clear History"
    on = "failed"
    icon = "hand-o-up"

    def process(self, instance):
        """Repair by deleting the history of meshes"""
        invalid = _get_has_history()
        for each in invalid:
            cmds.select(each, r=True)
            mel.eval("DeleteHistory;")
            self.log.info("Success on deleting history of %s" % each)


class ValidateHistory(pyblish.api.InstancePlugin):
    """Your model have History or not..!?"""

    order = pyblish.api.ValidatorOrder
    families = ['anr.model']
    hosts = ['maya']
    optional = True
    label = "Detect History"
    version = (0, 0, 2)

    actions = [
        pyblish.api.Category("Clear History"),
        ClearHistoryAction
    ]

    def process(self, instance):
        invalid = _get_has_history()

        if invalid:
            raise RuntimeError(
                "Meshes found in instance[{0}] with history: {1}".format(instance, invalid))

    # def repair(self, instance):
    #     """Repair by deleting the empty layers"""
    #     invalid = self._get_has_history()
    #     for each in invalid:
    #         cmds.select(each, r=True)
    #         mel.eval("DeleteHistory;")
    #         self.log.info("Success on deleting history of %s" % each)

Make sure you only check the objects in the instance. Here's some updated code:

import pyblish.api
from maya import cmds, mel


def _get_has_history(instance):
    """Return meshes in instance with history"""
    invalid = []
    for node in cmds.ls(instance, type='mesh'):
        if len(cmds.listHistory(node)) > 1:
            invalid.append(node)
            continue
    return invalid


class ClearHistoryAction(pyblish.api.Action):
    label = "Clear History"
    on = "failed"
    icon = "hand-o-up"

    def process(self, instance):
        """Repair by deleting the history of meshes"""
        invalid = _get_has_history(instance)
        for each in invalid:
            cmds.select(each, r=True)
            mel.eval("DeleteHistory;")
            self.log.info("Success on deleting history of %s" % each)


class ValidateHistory(pyblish.api.InstancePlugin):
    """Your model have History or not..!?"""

    order = pyblish.api.ValidatorOrder
    families = ['anr.model']
    hosts = ['maya']
    optional = True
    label = "Detect History"
    version = (0, 0, 2)

    actions = [
        pyblish.api.Category("Clear History"),
        ClearHistoryAction
    ]

    def process(self, instance):
        invalid = _get_has_history(instance)

        if invalid:
            raise RuntimeError(
                "Meshes found in instance[{0}] with history: {1}".format(instance, invalid))