Monitor field fails to update while object creation even if the when condition matches

[aravindacreoit]

Problem

Monitor field does not get updated while the creation of the model object even if matches the when condition

from model_utils.fields import MonitorField, StatusField

class Article(models.Model):
STATUS = Choices('draft', 'published')
status = StatusField()
published_at = MonitorField(monitor='status', when=['published'])

Here whenever we create Article object with status = 'published', published_at does not get updated with timestamp.

BUT when we change status of an already existing Article from draft to published, published_at gets updated with timestamp value.

ie monitor field gets updated only when an object is updated, not when an object is created.

Environment

• Django Model Utils version: 3.1.2
• Django version: 2.2
• Python version: 3.6 +