added strftime filter function

tools/search/multi_match_subquery.go

@@ -0,0 +1,70 @@
+package search
+
+import (
+	"fmt"
+	"strings"
+
+	"github.com/pocketbase/dbx"
+)
+
+var _ dbx.Expression = (*MultiMatchSubquery)(nil)
+
+// Join defines common fields required for a single SQL JOIN clause.
+type Join struct {
+	TableName  string
+	TableAlias string
+	On         dbx.Expression
+}
+
+// MultiMatchSubquery defines a multi-match record subquery expression.
+type MultiMatchSubquery struct {
+	TargetTableAlias string
+	FromTableName    string
+	FromTableAlias   string
+	ValueIdentifier  string
+	Joins            []*Join
+	Params           dbx.Params
+}
+
+// Build converts the expression into a SQL fragment.
+//
+// Implements [dbx.Expression] interface.
+func (m *MultiMatchSubquery) Build(db *dbx.DB, params dbx.Params) string {
+	if m.TargetTableAlias == "" || m.FromTableName == "" || m.FromTableAlias == "" {
+		return "0=1"
+	}
+
+	if params == nil {
+		params = m.Params
+	} else {
+		// merge by updating the parent params
+		for k, v := range m.Params {
+			params[k] = v
+		}
+	}
+
+	var mergedJoins strings.Builder
+	for i, j := range m.Joins {
+		if i > 0 {
+			mergedJoins.WriteString(" ")
+		}
+		mergedJoins.WriteString("LEFT JOIN ")
+		mergedJoins.WriteString(db.QuoteTableName(j.TableName))
+		mergedJoins.WriteString(" ")
+		mergedJoins.WriteString(db.QuoteTableName(j.TableAlias))
+		if j.On != nil {
+			mergedJoins.WriteString(" ON ")
+			mergedJoins.WriteString(j.On.Build(db, params))
+		}
+	}
+
+	return fmt.Sprintf(
+		`SELECT %s as [[multiMatchValue]] FROM %s %s %s WHERE %s = %s`,
+		db.QuoteColumnName(m.ValueIdentifier),
+		db.QuoteTableName(m.FromTableName),
+		db.QuoteTableName(m.FromTableAlias),
+		mergedJoins.String(),
+		db.QuoteColumnName(m.FromTableAlias+".id"),
+		db.QuoteColumnName(m.TargetTableAlias+".id"),
+	)
+}