SearchVector doesn't support querying non-text fields

[mickaelmarin]

I try to implement autocomplete on my place table that look like below:

class Place(models.Model):
    name = models.CharField(max_length=80, blank=True)
    num = models.IntegerField(null=True)
    street = models.CharField(max_length=100, blank=True)
    postal_code = models.IntegerField(null=True)
    district = models.CharField(max_length=30, blank=True)
    city=models.CharField(max_length=30, blank=True)
    country = models.CharField(max_length=30, blank=True)
    domicile = models.BooleanField(default=False)

    def __str__(self):
        address = "{0}, {1}, {2}, {3}".format(self.num, self.street, 
                                              self.postal_code, self.city, self.country)
        return address

and in my function that return the result for display my address on frontend is like (self.q is a GET param from ajax call):

qs = Place.objects.all()
qs.annotate(search=SearchVector('street', 'country','city', 'num')).filter(search__icontains=self.q)

I have this error when the ajax call run:

  File "/opt/coupdepouce/lib/python3.6/site-packages/django/db/backends/utils.py", line 64, in execute
    return self.cursor.execute(sql, params)
django.db.utils.DataError: invalid input syntax for integer: ""
LINE 1: ...city", '') || ' ' || COALESCE("user_place"."num", '')) AS "s...

[Tim Graham]

The problem seems to be ​hardcoded Value(''), regardless of the field type. I'm not sure what the proper resolution is.