feat(events): partial word search

server/src/model/event.go

@@ -138,6 +138,29 @@ func GetEvent(db *sqlx.DB, options GetEventOptions) (Event, error) {
 	return events[0], nil
 }
 
+// eventNameBooleanQuery converts a free-text event-name search into a MySQL
+// fulltext boolean-mode query where each term is given a trailing '*' so that
+// prefixes match. Boolean-mode operator characters are replaced with spaces so
+// that they are neither interpreted as operators nor merge adjacent words into
+// a token that cannot match: MySQL's fulltext parser splits on those characters
+// at index time (e.g. "anti-fur" is stored as "anti" and "fur"), so a
+// concatenated "antifur" would never match.
+func eventNameBooleanQuery(query string) string {
+	cleaned := strings.Map(func(r rune) rune {
+		switch r {
+		case '+', '-', '<', '>', '(', ')', '~', '*', '"', '@':
+			return ' '
+		}
+		return r
+	}, query)
+
+	var terms []string
+	for _, field := range strings.Fields(cleaned) {
+		terms = append(terms, field+"*")
+	}
+	return strings.Join(terms, " ")
+}
+
 func getEvents(db *sqlx.DB, options GetEventOptions) ([]Event, error) {
 	query := `SELECT e.id, e.name, e.date, e.event_type, e.survey_sent, e.suppress_survey, e.circle_id, e.chapter_id FROM events e `
 
@@ -189,7 +212,10 @@ ON (e.id = ea.event_id AND ea.activist_id = a.id)
 		where("e.event_type like ?", options.EventType)
 	}
 	if options.EventNameQuery != "" {
-		where("MATCH (e.name) AGAINST (?)", options.EventNameQuery)
+		// Use boolean mode with a trailing '*' on each term so that
+		// prefixes match (e.g. "chapt" matches "chapter meeting"), not
+		// just whole words as in natural-language mode.
+		where("MATCH (e.name) AGAINST (? IN BOOLEAN MODE)", eventNameBooleanQuery(options.EventNameQuery))
 	}
 
 	// Add the where clauses to the query.

server/src/model/event_test.go

@@ -171,6 +171,68 @@ func TestGetEvents_orderBy(t *testing.T) {
 	require.Equal(t, gotEvents[1].EventName, "earlier event")
 }
 
+func TestEventNameBooleanQuery(t *testing.T) {
+	tests := []struct {
+		name  string
+		input string
+		want  string
+	}{
+		{"single word", "chapter", "chapter*"},
+		{"multiple words", "chapter meeting", "chapter* meeting*"},
+		{"collapses extra whitespace", "  chapter   meeting  ", "chapter* meeting*"},
+		{"strips boolean operators", "+chapter -meeting", "chapter* meeting*"},
+		{"strips wildcards and quotes", "*chap* \"meet\"", "chap* meet*"},
+		{"splits on operators within a term", "anti-fur", "anti* fur*"},
+		{"splits on embedded operators across terms", "anti-fur pro+test", "anti* fur* pro* test*"},
+		{"drops operator-only terms", "chapter + -", "chapter*"},
+		{"empty input", "", ""},
+		{"whitespace only", "   ", ""},
+	}
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			require.Equal(t, tt.want, eventNameBooleanQuery(tt.input))
+		})
+	}
+}
+
+func TestGetEvents_nameQueryPrefix(t *testing.T) {
+	db := testdb.NewDB()
+	defer func() { _ = db.Close() }()
+
+	d1, err := time.Parse("2006-01-02", "2017-01-15")
+	require.NoError(t, err)
+
+	for _, name := range []string{"chapter meeting", "potluck dinner", "anti-fur protest"} {
+		_, err := InsertUpdateEvent(db, Event{
+			EventName: name,
+			EventDate: d1,
+			EventType: "Working Group",
+			ChapterID: 1,
+		})
+		require.NoError(t, err)
+	}
+
+	// A whole-word query still matches.
+	gotEvents, err := GetEvents(db, GetEventOptions{EventNameQuery: "chapter"})
+	require.NoError(t, err)
+	require.Len(t, gotEvents, 1)
+	require.Equal(t, "chapter meeting", gotEvents[0].EventName)
+
+	// A prefix of a word now matches too.
+	gotEvents, err = GetEvents(db, GetEventOptions{EventNameQuery: "chapt"})
+	require.NoError(t, err)
+	require.Len(t, gotEvents, 1)
+	require.Equal(t, "chapter meeting", gotEvents[0].EventName)
+
+	// A hyphenated query matches a hyphenated name: MySQL tokenizes both sides
+	// of the hyphen, so the operator must split the term rather than collapse it.
+	gotEvents, err = GetEvents(db, GetEventOptions{EventNameQuery: "anti-fur"})
+	require.NoError(t, err)
+	require.Len(t, gotEvents, 1)
+	require.Equal(t, "anti-fur protest", gotEvents[0].EventName)
+}
+
 func TestInsertUpdateEvent(t *testing.T) {
 	db := testdb.NewDB()
 	defer func() { _ = db.Close() }()