[Answer]-TypeError when trying to JSON serialise a custom Django model field

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The code in the doc is just a boilerplate, you need to implement value_to_string to return a string representing the relativedelta.

The RelativeDeltaField is based on models.CharField, thus the get_prep_value() looks like 

def get_prep_value(self, value):
    return self.to_python(value)

It’s OK for CharField because the intended value in Python of the field is already a string. However, your customized version of to_python() returns relativedelta instead of string.

👤okm

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