Handle Associations with pointer of pointer, close #3130

association.go

@@ -30,7 +30,10 @@ func (db *DB) Association(column string) *Association {
 			association.Error = fmt.Errorf("%w: %v", ErrUnsupportedRelation, column)
 		}
 
-		db.Statement.ReflectValue = reflect.Indirect(reflect.ValueOf(db.Statement.Model))
+		db.Statement.ReflectValue = reflect.ValueOf(db.Statement.Model)
+		for db.Statement.ReflectValue.Kind() == reflect.Ptr {
+			db.Statement.ReflectValue = db.Statement.ReflectValue.Elem()
+		}
 	} else {
 		association.Error = err
 	}

tests/associations_belongs_to_test.go

@@ -18,7 +18,10 @@ func TestBelongsToAssociation(t *testing.T) {
 	// Find
 	var user2 User
 	DB.Find(&user2, "id = ?", user.ID)
-	DB.Model(&user2).Association("Company").Find(&user2.Company)
+	pointerOfUser := &user2
+	if err := DB.Model(&pointerOfUser).Association("Company").Find(&user2.Company); err != nil {
+		t.Errorf("failed to query users, got error %#v", err)
+	}
 	user2.Manager = &User{}
 	DB.Model(&user2).Association("Manager").Find(user2.Manager)
 	CheckUser(t, user2, user)