feat(plugin/table): generate helper methods for single-column 'get' with IN queries

_example/go.mod

@@ -1,7 +1,6 @@
 module github.com/mackee/go-sqlla/_example
 
-go 1.22.0
-toolchain go1.24.1
+go 1.24.2
 
 replace github.com/mackee/go-sqlla/v2 => ../
 

_example/group.go

@@ -13,7 +13,7 @@ type GroupID uint64
 //genddl:table group
 //sqlla:plugin myrelations key=LeaderUserID:User.ID method=Leader
 //sqlla:plugin slice
-//sqlla:plugin table get=ID&LeaderUserID list=LeaderUserID&SubLeaderUserID create=Name,LeaderUserID,SubLeaderUserID,ChildGroupID,CreatedAt
+//sqlla:plugin table get=ID&LeaderUserID,ID list=LeaderUserID&SubLeaderUserID create=Name,LeaderUserID,SubLeaderUserID,ChildGroupID,CreatedAt
 type Group struct {
 	ID              GroupID         `db:"id,primarykey,autoincrement"`
 	Name            string          `db:"name"`

_example/group_plugin_test.go

@@ -49,4 +49,26 @@ func TestPlugin__Group__Table(t *testing.T) {
 	if len(rows) != 2 {
 		t.Error("unexpected len(rows):", len(rows))
 	}
+
+	allRows, closer := example.NewGroupSQL().Select().IterContext(ctx, db)
+	var ids []example.GroupID
+	func() {
+		defer closer()
+		for row, err := range allRows {
+			if err != nil {
+				t.Error("cannot iterate rows error:", err)
+			}
+			if row.ID == 0 {
+				t.Error("unexpected row.ID:", row.ID)
+			}
+			ids = append(ids, row.ID)
+		}
+	}()
+	expectedRows, err := table.ListByIDS(ctx, db, ids)
+	if err != nil {
+		t.Error("cannot list rows by ids error:", err)
+	}
+	if len(expectedRows) != len(ids) {
+		t.Error("unexpected len(expectedRows):", len(expectedRows))
+	}
 }

template/plugins/table.tmpl

@@ -32,6 +32,24 @@ func ({{ $receiver }} *{{ $tableTypeName }}) GetBy{{ $methodName }}(ctx context.
 	}
 	return &row, nil
 }
+{{- if eq (len $columnNames) 1 }}
+{{ $columnName := index $columnNames 0 }}
+{{ $listColumnName := $columnName | pluralize }}
+func ({{ $receiver }} *{{ $tableTypeName }}) ListBy{{ $listColumnName }}(ctx context.Context, db sqlla.DB, cs []{{ ($table.Lookup $columnName).TypeName }}) ({{ $sliceTypeName }}, error) {
+	_rows, err := New{{ $structName }}SQL().Select().
+		{{ $column := $table.Lookup $columnName }}
+		{{ $column.MethodName }}In(cs...).
+		AllContext(ctx, db)
+	if err != nil {
+		return nil, fmt.Errorf("failed to list {{ $structName | pluralize }} by {{ $listColumnName }}: %w", err)
+	}
+	rows := make({{ $sliceTypeName }}, len(_rows))
+	for i := range _rows {
+		rows[i] = &_rows[i]
+	}
+	return rows, nil
+}
+{{- end }}
 {{- end }}
 {{- end }}