[Fixed]-'ManyToManyField' queries

Update after comments:

Documentation about Many-to-many relation

def get_intolerancias(self):
        alimentos = self.ingredientes.all() # Give us all alimento of a recetta
        intolerancias = []
        for a in alimentos:
            intolerancias.append(a.get_intolerancia_display())            
        return intolerancias