[#2992] added migration to reset already inserted null values

migrations/1690319366_reset_null_values.go

@@ -0,0 +1,58 @@
+package migrations
+
+import (
+	"fmt"
+
+	"github.com/pocketbase/dbx"
+	"github.com/pocketbase/pocketbase/daos"
+	"github.com/pocketbase/pocketbase/models"
+	"github.com/pocketbase/pocketbase/models/schema"
+)
+
+// Reset all previously inserted NULL values to the fields zero-default.
+func init() {
+	AppMigrations.Register(func(db dbx.Builder) error {
+		dao := daos.New(db)
+
+		collections := []*models.Collection{}
+		if err := dao.CollectionQuery().All(&collections); err != nil {
+			return err
+		}
+
+		for _, collection := range collections {
+			if collection.IsView() {
+				continue
+			}
+
+			for _, f := range collection.Schema.Fields() {
+				defaultVal := "''"
+
+				switch f.Type {
+				case schema.FieldTypeJson:
+					continue
+				case schema.FieldTypeBool:
+					defaultVal = "FALSE"
+				case schema.FieldTypeNumber:
+					defaultVal = "0"
+				default:
+					if opt, ok := f.Options.(schema.MultiValuer); ok && opt.IsMultiple() {
+						defaultVal = "'[]'"
+					}
+				}
+
+				_, err := db.NewQuery(fmt.Sprintf(
+					"UPDATE {{%s}} SET [[%s]] = %s WHERE [[%s]] IS NULL",
+					collection.Name,
+					f.Name,
+					defaultVal,
+					f.Name,
+				)).Execute()
+				if err != nil {
+					return err
+				}
+			}
+		}
+
+		return nil
+	}, nil)
+}