Set value of an unknown Django Model Field

Question

I am implementing a function that gets a model class as a parameter, and should get a dictionary from the same model, set model fields to namesake keys in such dictionary, and save the model to the database.

This is the code of the function:

def populate_model(self, model_to_populate): model_to_populate_instance = model_to_populate() if hasattr(model_to_populate_instance, 'populate_data'): populate_data = getattr(model_to_populate, 'populate_data') for key, value in populate_data.items(): field = getattr(model_to_populate_instance, key) field = value model_to_populate_instance.save()

Something is wrong because I don't get values from the dictionary in the database, but objects GeneralApp.models.CustomCharField>. I guess I am not succeeding to set the value of the model instance field to the value in the dictionary.

O would appreciate your help.

@e4c5 it is not a field, it is a dictionary attribute with some information that must be populated to the database table related to the model — HuLu ViCa
– HuLu ViCa, Commented Aug 20, 2018 at 3:06
@HugoLuisVillalobosCanto What you mean by "and should get a dictionary from the same model" ? — JPG
– JPG, Commented Aug 20, 2018 at 3:27
@Jerin Peter George, that the model received as a parameter has a dictionary attribute that must be accessed (populate_data = getattr(model_to_populate, 'populate_data') — HuLu ViCa
– HuLu ViCa, Commented Aug 20, 2018 at 6:06

RishiG · Accepted Answer · 2018-08-20 04:06:04Z

Replace the lines

 field = getattr(model_to_populate_instance, key) field = value

with

 setattr(model_to_populate_instance, key, value)

Reason: the return value of getattr is the value of the attribute, not a reference to the attribute itself (if it were a reference, it wouldn't make sense to set field = value anyway.

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