Django – i cant migrate my model "prestamo"

Question

this is my model

class  Prestamo(models.Model):
    lector = models.ForeignKey( Lector, on_delete=models.CASCADE)
    libro = models.ForeignKey(Libro, on_delete=models.CASCADE , related_name='libro_prestamo') 
    fecha_prestamo = models.DateField()
    fecha_devolucion = models.DateField(blank=True, null=True)
    devuelto = models.BooleanField()

and this is my error in console

  return self.cursor.execute(sql, params)
django.db.utils.IntegrityError: inserción o actualización en la tabla «lector_prestamo» viola la llave foránea «lector_prestamo_libro_id_c94b640a_fk_libro_libro_id»
DETAIL:  La llave (libro_id)=(0) no está presente en la tabla «libro_libro».

i dont know how to solve it

Asked By: Facu

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Source

Answer 1

Try deleting/removing your db.sqlite3 file and all your migration files in migration folder
then run python manage.py makemigrations followed by python manage.py migrate

Answered By: snipher marube

Django – i cant migrate my model "prestamo"

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