[Answered ]-Django Rest Framework: TypeError: Object of type Facility is not JSON serializable

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The issue is in the to_representation method for the serializer.

def to_representation(self, instance):
        representation = super().to_representation(instance)

        representation["scheduled_datetime"] = instance.LeadFacilityAssociation.first().scheduled_datetime
        representation["assigned_facilities"] = instance.LeadFacilityAssociation.first().assigned_facilities
        print(instance.LeadFacilityAssociation.first().assigned_facilities)
        return representation

The issue is that in this part representation["assigned_facilities"] = instance.LeadFacilityAssociation.first().assigned_facilities an instance of the assigned facility is returned and as the error message says instances are not JSON serializable.
What you can do is assign representation["assigned_facilities"] to the assigned facilities name or id like this:

def to_representation(self, instance):
        representation = super().to_representation(instance)

        representation["scheduled_datetime"] = instance.LeadFacilityAssociation.first().scheduled_datetime
        # You can use the name or whatever field fits similar to what you have above
        representation["assigned_facilities"] = instance.LeadFacilityAssociation.first().assigned_facilities.id
        print(instance.LeadFacilityAssociation.first().assigned_facilities)
        return representation
👤kwamito

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