Hi,

> Anyone knows where the problem is?

If you are using the Admin app to populate tags then the automatic
manipulators first call Receta.save() followed by setting the models
M2M field. This wipes out your changes to etiquetas inside
Receta.save()

One solution is to add get_tags and set_tags methods to Receta and do
a lazy initialization of your M2M field i.e. if get_tags finds that
self.etiquetas.all() is empty, it first populates self.etiquetas.
Then, for brownie points, wrap the get_tags and set_tags methods
around a property so you can do straight assignments.

-Rajesh



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