move utilities out of db-specific packages

DestName & NormalCols now live in root dbx package utilizing union
interfaces. SoftDelete helper has been dropped.

utility.go

@@ -6,10 +6,30 @@ import (
 	"strings"
 	"time"
 
+	"gitea.auvem.com/go-toolkit/dbx/internal/dbxshared"
 	"github.com/go-jet/jet/v2/mysql"
+	"github.com/go-jet/jet/v2/postgres"
 	"golang.org/x/exp/constraints"
 )
 
+// Column is a union type for mysql.Column and postgres.Column
+type Column interface {
+	mysql.Column
+	postgres.Column
+}
+
+// ColumnList is a union type for mysql.ColumnList and postgres.ColumnList
+type ColumnList interface {
+	mysql.ColumnList
+	postgres.ColumnList
+}
+
+// BoolExpression is a union type for mysql.BoolExpression and postgres.BoolExpression
+type BoolExpression interface {
+	mysql.BoolExpression
+	postgres.BoolExpression
+}
+
 // StringToFilter processes a string to be used as a filter in an SQL LIKE
 // statement. It replaces all spaces with % and adds % to the beginning and
 // end of the string.
@@ -24,6 +44,55 @@ func StringToFilter(str string) string {
 	return str
 }
 
+// DestName returns the name of the type passed as `destTypeStruct` as a string,
+// normalized for compatibility with the Jet QRM.
+func DestName(destTypeStruct any, path ...string) string {
+	v := reflect.ValueOf(destTypeStruct)
+	for v.Kind() == reflect.Pointer {
+		v = v.Elem()
+	}
+
+	destIdent := v.Type().String()
+	destIdent = destIdent[strings.LastIndex(destIdent, ".")+1:]
+
+	for i, p := range path {
+		if v.Kind() != reflect.Struct {
+			dbxshared.DBModule.Logger().Error("DestName: path parent is not a struct", "path", destIdent+"."+strings.Join(path[:i+1], "."))
+			return ""
+		}
+
+		v = v.FieldByName(p)
+
+		if !v.IsValid() {
+			dbxshared.DBModule.Logger().Error("DestName: field does not exist", "path", destIdent+"."+strings.Join(path[:i+1], "."))
+			return ""
+		}
+
+		destIdent += "." + p
+	}
+
+	return destIdent
+}
+
+// NormalCols processes a list of columns and strips out any that implement any of
+// ColumnTimestamp, ColumnTime, or ColumnDate.
+func NormalCols[CL ColumnList](cols ...Column) CL {
+	res := make(CL, 0)
+
+	for _, col := range cols {
+		switch col.(type) {
+		case mysql.ColumnTimestamp, // = postgres.ColumnTimestamp
+			mysql.ColumnTime, // = postgres.ColumnTime
+			mysql.ColumnDate: // = postgres.ColumnDate
+			// skip time/date/timestamp columns
+		default:
+			res = append(res, col)
+		}
+	}
+
+	return res
+}
+
 // ExprValues converts a list of values to a list of mysql.Expression values using
 // function f to transform the values (mysql.String for strings, mysql.Uint64, etc).
 func ExprValues[T any](values []T, f func(T) mysql.Expression) []mysql.Expression {