Unsupported operation error creating and saving json file

Ive been trying to save a json file created from a to a filefield, I got an unsuported operation error "not readable", this is my code

from django.core.files.base import File

@receiver(post_save,sender=ProyArq)
def ifc_a_json(sender,instance,*args,**kwargs):
    if instance.arch_ifc:
        jsoon = ifc_2_json("path_to_file")
        json_file_nom = instance.nombre.replace(' ','')+'.json'

        with open(json_file_nom, 'w') as outfile:
            json.dump(jsoon, outfile, indent=2)
            json_fk = JsonIFC.objects.create(proy_fk=instance)
            json_fk.ifc_json.save(json_file_nom,File(outfile),True)

im working with IFC files, and I want to store them also as json, I tried instead of saving the json as a JSONField, to save it as a foreign key file since the size of the json Im working are above 10mb, is this the best approach for this??

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