Tencent/WeKnora · error

ego graph requires a center slug

Error message

ego graph requires a center slug

What it means

Raised in computeGraphSubset when WikiGraphModeEgo is requested but req.Center is an empty slug — the ego graph slice is defined by a center node, so without one the request is invalid. Input guard before center-page existence is checked.

Source

Thrown at internal/application/service/wiki_page.go:628

	for _, id := range req.FamiliarKnowledgeIDs {
		if id = strings.TrimSpace(id); id != "" {
			familiarSet[id] = struct{}{}
		}
	}

	pageBySlug := make(map[string]*types.WikiPage, len(pages))
	linkCount := make(map[string]int, len(pages))
	for _, p := range pages {
		pageBySlug[p.Slug] = p
		linkCount[p.Slug] = len(p.InLinks) + len(p.OutLinks)
	}

	// Select the node slug set for the requested slice.
	var selected map[string]struct{}
	switch mode {
	case types.WikiGraphModeEgo:
		if req.Center == "" {
			return nil, errors.New("ego graph requires a center slug")
		}
		if _, ok := pageBySlug[req.Center]; !ok {
			return nil, fmt.Errorf("ego center slug %q not found", req.Center)
		}
		depth := req.Depth
		if depth < 1 {
			depth = 1
		}
		selected = bfsEgoSlugs(pageBySlug, req.Center, depth, typeAllow, req.Limit)
	default:
		// overview: keep only type-allowed candidates, sort by link_count desc, cap.
		candidates := make([]*types.WikiPage, 0, len(pages))
		for _, p := range pages {
			if hasTypeFilter && !typeAllow[p.PageType] {
				continue
			}
			candidates = append(candidates, p)
		}

View on GitHub (pinned to 988cbb0330)

Solutions

1. Provide a center slug in the graph request when using ego mode
2. Use overview mode if no specific center node is intended

When it happens

Trigger: Thrown at internal/application/service/wiki_page.go:628 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of Tencent/WeKnora@988cbb0330 (2026-09-02). Data as JSON: /api/errors/c94f88b96b94a54e. Report an issue: GitHub.