siyuan-note/siyuan · error

block [ ] is not an instance of attribute view [ ]

Error message

block [%s] is not an instance of attribute view [%s]

What it means

The node identified by blockID must be an ast.NodeAttributeView block whose AttributeViewID equals the given avID. If the block is a different node type, or belongs to a different attribute view, the kernel refuses to write the visible-view IDs attribute onto it.

Solutions

1. Verify the block is a database block (type 'NodeAttributeView' in the .sy tree) and read its own avID from node.AttributeViewID / the block's 'av' attribute before calling.
2. Use the avID that belongs to the given blockID, not an unrelated attribute view.
3. Re-resolve the block by ID after edits; if the block no longer exists as a database, surface a user-facing error instead of retrying.

Example fix

// before
setVisibleViews(someBlockId, avIdFromMemory, viewIds);
// after
const node = getNode(blockId);
if (node && node.type === 'NodeAttributeView') {
  setVisibleViews(blockId, node.avId, viewIds);
}

const node = getNode(blockID);
if (!node || node.type !== 'NodeAttributeView' || node.avId !== avID) throw new Error('block is not an instance of this attribute view');

const isAttrViewNode = (n: { type: string; avId?: string } | null, avID: string): boolean => !!n && n.type === 'NodeAttributeView' && n.avId === avID;

try { await setVisibleViews(blockID, avID, viewIDs); } catch (e) { if (String(e).includes('is not an instance of attribute view')) { console.warn('block/av mismatch', blockID, avID); } else throw e; }

When it happens

Trigger: Calling SetDatabaseBlockVisibleViews with a blockID pointing to a paragraph/heading/other block, or to a database block whose attribute view ID differs from the avID argument.

Common situations: Passing a container/parent block ID instead of the database block ID; block was converted to another type; avID copied from another database after copy-pasting blocks; stale references after undo/redo.

Understand the failure class

Background: "is not a compatible type" / "cannot merge" errors: when a value's type doesn't match what the library requires — this error's family across 65 libraries.

Related errors

• date display format is only available for date fields
• filters must be an array
• invalid attribute view column widths
• invalid attribute view field template
• invalid attribute view source

AI-assisted analysis of siyuan-note/siyuan@9f775e8a12 (2026-09-19). Data as JSON: /api/errors/f747551e5f3f03a0. Report an issue: GitHub.

Appendix: source

Thrown at kernel/model/attribute_view.go:1418

		visible[viewID] = true
	}

	var normalized []string
	for _, view := range attrView.Views {
		if visible[view.ID] {
			normalized = append(normalized, view.ID)
		}
	}
	if 1 > len(normalized) {
		return errors.New("at least one visible view is required")
	}

	node, tree, err := getNodeByBlockID(nil, blockID)
	if nil != err {
		return
	}
	if ast.NodeAttributeView != node.Type || node.AttributeViewID != avID {
		return fmt.Errorf("block [%s] is not an instance of attribute view [%s]", blockID, avID)
	}

	err = setNodeAttrs(node, tree, map[string]string{
		av.NodeAttrVisibleViewIDs: strings.Join(normalized, ","),
	})
	return
}

func (tx *Transaction) doChangeAttrViewLayout(operation *Operation) (ret *TxErr) {
	err := ChangeAttrViewLayout(operation.BlockID, operation.AvID, operation.Layout)
	if err != nil {
		return &TxErr{code: TxErrHandleAttributeView, id: operation.AvID, msg: err.Error()}
	}
	return
}

func ChangeAttrViewLayout(blockID, avID string, newLayout av.LayoutType) (err error) {
	attrView, err := av.ParseAttributeView(avID)

View on GitHub (pinned to 9f775e8a12)