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DynamicField doesn't save as a ListField #2743
Description
Updating a DynamicField of a list does not update using .save() or .cascade_save() when the list is updated using .append().
System Info
Ubuntu 20.04 LTS
MongoDB v6.0.4
mongoengine v0.26.0
pymongo v3.12.3
Reproducible Example
class ExampleModel(DynamicDocument):
value = DynamicField()Actual Result
>>> example = ExampleModel(value=[])
>>> example.value.append(1)
>>> example.save()
<ExampleModel: ExampleModel object>
>>> example.value
[1]
>>> example.reload()
<ExampleModel: ExampleModel object>
>>> example.value
[]Expected Result
>>> example = ExampleModel(value=[])
>>> example.value.append(1)
>>> example.save()
<ExampleModel: ExampleModel object>
>>> example.value
[1]
>>> example.reload()
<ExampleModel: ExampleModel object>
>>> example.value
[1]Work-Around
>>> example = ExampleModel(value=[])
>>> example.value.append(1)
>>> example.save()
<ExampleModel: ExampleModel object>
>>> a = list(example.value)
>>> a.append(1)
>>> example.value = a
>>> example.save()
>>> example.value
[1]
>>> example.reload()
<ExampleModel: ExampleModel object>
>>> example.value
[1]
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