Fixed #29582 -- Fixed a crash when using SearchVector with non text-fields.

The PostgreSQL concat() function handles nulls and non-text values better than
the || operator.

django/contrib/postgres/search.py

 from django.db.models import Field, FloatField
 from django.db.models.expressions import CombinedExpression, Func, Value
-from django.db.models.functions import Coalesce
 from django.db.models.lookups import Lookup
 
 
@@ -46,15 +45,13 @@ class SearchVectorCombinable:
 
 class SearchVector(SearchVectorCombinable, Func):
     function = 'to_tsvector'
-    arg_joiner = " || ' ' || "
+    arg_joiner = ", ' ',"
+    template = '%(function)s(concat(%(expressions)s))'
     output_field = SearchVectorField()
     config = None
 
     def __init__(self, *expressions, **extra):
         super().__init__(*expressions, **extra)
-        self.source_expressions = [
-            Coalesce(expression, Value('')) for expression in self.source_expressions
-        ]
         self.config = self.extra.get('config', self.config)
         weight = self.extra.get('weight')
         if weight is not None and not hasattr(weight, 'resolve_expression'):
@@ -75,7 +72,7 @@ class SearchVector(SearchVectorCombinable, Func):
         if template is None:
             if self.config:
                 config_sql, config_params = compiler.compile(self.config)
-                template = "%(function)s({}::regconfig, %(expressions)s)".format(config_sql.replace('%', '%%'))
+                template = "%(function)s({}::regconfig, concat(%(expressions)s))".format(config_sql.replace('%', '%%'))
             else:
                 template = self.template
         sql, params = super().as_sql(compiler, connection, function=function, template=template)

tests/postgres_tests/test_search.py

@@ -155,6 +155,12 @@ class MultipleFieldsTest(GrailTestData, PostgreSQLTestCase):
         ).filter(search='bedemir')
         self.assertEqual(set(searched), {self.bedemir0, self.bedemir1, self.crowd, self.witch, self.duck})
 
+    def test_search_with_non_text(self):
+        searched = Line.objects.annotate(
+            search=SearchVector('id'),
+        ).filter(search=str(self.crowd.id))
+        self.assertSequenceEqual(searched, [self.crowd])
+
     def test_config_query_explicit(self):
         searched = Line.objects.annotate(
             search=SearchVector('scene__setting', 'dialogue', config='french'),