text search query

pgm_field.go

@@ -153,8 +153,8 @@ func (f Field) DateTrunc(level, as string) Field {
 	return Field("DATE_TRUNC('" + level + "', " + f.String() + ") AS " + as)
 }
 
-func (f Field) TsRank(query, as string) Field {
-	return Field("TS_RANK(" + f.String() + ", " + query + ") AS " + as)
+func (f Field) TsRank(fieldName, as string) Field {
+	return Field("TS_RANK(" + f.String() + ", " + fieldName + ") AS " + as)
 }
 
 // EqualFold will use LOWER(column_name) = LOWER(val) for comparision

pgm_table.go

@@ -1,13 +1,8 @@
 package pgm
 
-import (
-	"strconv"
-)
-
 // Table in database
 type Table struct {
-	tsQuery   *string
-	tsQueryAs *string
+	textSearch *textSearchCTE
 
 	Name         string
 	DerivedTable Query
@@ -16,6 +11,13 @@ type Table struct {
 	debug        bool
 }
 
+// text search  Common Table Expression
+type textSearchCTE struct {
+	name  string
+	value string
+	alias string
+}
+
 // Debug when set true will print generated query string in stdout
 func (t *Table) Debug() Clause {
 	t.debug = true
@@ -38,9 +40,8 @@ func (t *Table) Insert() InsertClause {
 	return qb
 }
 
-func (t *Table) WithTsQuery(q, as string) *Table {
-	t.tsQuery = &q
-	t.tsQueryAs = &as
+func (t *Table) WithTextSearch(name, alias, textToSearch string) *Table {
+	t.textSearch = &textSearchCTE{name: name, value: textToSearch, alias: alias}
 	return t
 }
 
@@ -49,6 +50,7 @@ func (t *Table) Select(field ...Field) SelectClause {
 	qb := &selectQry{
 		debug:      t.debug,
 		fields:     field,
+		textSearch: t.textSearch,
 	}
 
 	if t.DerivedTable != nil {
@@ -59,18 +61,6 @@ func (t *Table) Select(field ...Field) SelectClause {
 		qb.table = t.Name
 	}
 
-	if t.tsQuery != nil {
-		var as string
-		if t.tsQueryAs != nil && *t.tsQueryAs != "" {
-			as = *t.tsQueryAs
-		} else {
-			// add default as field
-			as = "query"
-		}
-		qb.args = append(qb.args, as)
-		qb.table += ", TO_TSQUERY('english', $" + strconv.Itoa(len(qb.args)) + ") " + as
-	}
-
 	return qb
 }
 

playground/qry_select_test.go

@@ -107,15 +107,19 @@ func TestSelectDerived(t *testing.T) {
 }
 
 func TestSelectTV(t *testing.T) {
-	expected := "SELECT users.first_name, users.last_name, users.email, TS_RANK(users.search_vector, query) AS rank" +
-		" FROM users, TO_TSQUERY('english', $1) query" +
-		" WHERE users.status_id = $2 AND users.search_vector @@ query" +
+	expected := "WITH ts AS (SELECT to_tsquery('english', $1) AS query)" +
+		" SELECT users.first_name, users.last_name, users.email, TS_RANK(users.search_vector, ts.query) AS rank" +
+		" FROM users" +
+		" JOIN user_sessions ON users.id = user_sessions.user_id" +
+		" CROSS JOIN ts" +
+		" WHERE users.status_id = $2 AND users.search_vector @@ ts.query" +
 		" ORDER BY rank DESC"
 
 	qry := db.User.
-		WithTsQuery("anki", "query").
-		Select(user.FirstName, user.LastName, user.Email, user.SearchVector.TsRank("query", "rank")).
-		Where(user.StatusID.Eq(1), user.SearchVector.TsQuery("query")).
+		WithTextSearch("ts", "query", "text to search").
+		Select(user.FirstName, user.LastName, user.Email, user.SearchVector.TsRank("ts.query", "rank")).
+		Join(db.UserSession, user.ID, usersession.UserID).
+		Where(user.StatusID.Eq(1), user.SearchVector.TsQuery("ts.query")).
 		OrderBy(pgm.Field("rank").Desc())
 
 	got := qry.String()

qry_select.go

@@ -135,6 +135,8 @@ type (
 	}
 
 	selectQry struct {
+		textSearch *textSearchCTE
+
 		table   string
 		fields  []Field
 		args    []any
@@ -313,6 +315,12 @@ func (q *selectQry) Build(needArgs bool) (qry string, args []any) {
 
 	sb.Grow(q.averageLen())
 
+	if q.textSearch != nil {
+		var ts = q.textSearch
+		q.args = slices.Insert(q.args, 0, any(ts.value))
+		sb.WriteString("WITH " + ts.name + " AS (SELECT to_tsquery('english', $1) AS " + ts.alias + ") ")
+	}
+
 	// SELECT
 	sb.WriteString("SELECT ")
 	sb.WriteString(joinFileds(q.fields))
@@ -323,6 +331,11 @@ func (q *selectQry) Build(needArgs bool) (qry string, args []any) {
 		sb.WriteString(" " + strings.Join(q.join, " "))
 	}
 
+	// Search Query Cross join
+	if q.textSearch != nil {
+		sb.WriteString(" CROSS JOIN " + q.textSearch.name)
+	}
+
 	// WHERE
 	if len(q.where) > 0 {
 		sb.WriteString(" WHERE ")