It is impossible to add a non-nullable field 'name' to table without specifying a default

class Track(gisModels.Model):
    track = gisModels.PolygonField()

class GeoFence(gisModels.Model):
    track = models.ForeignKey(Track, on_delete=models.CASCADE)
    fence = gisModels.PolygonField(geography=True)

The above code is my models.

It is impossible to add a non-nullable field 'track' to geofence without specifying a default. This is because the database needs something to populate existing rows.

Please select a fix:

 1) Provide a one-off default now (will be set on all existing rows with a null value for this column)

 2) Quit and manually define a default value in models.py.

Select an option: 

I have no idea to solve it out.

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