What causes "Failed to resolve child path {path}. Reason: {e:?}" in FyroxEngine/Fyrox?

Validate the path resolves on the node (e.g. via resolve_path read-only) before reverting

Failed to resolve child path

Error message

Failed to resolve child path {path}. Reason: {e:?}

What it means

Logged in fyrox-graph's revert_inheritable_property when resolve_path_mut fails to find the given property path on the child node. Without the child field, the revert cannot be applied. Typically a stale/renamed path or a property that doesn't exist on that node type.

Solutions

Validate the path resolves on the node (e.g. via resolve_path read-only) before reverting
Confirm the node type actually has the property in the current engine version
Re-save the scene with the current engine version
Guard batch reverts per node type instead of applying a shared path to all nodes

Defensive patterns

Strategy: validation

Validate before calling

let mut found = false;
child.resolve_path(path, &mut |r| found |= r.is_ok());
if !found { return Ok(()); } // skip missing paths in batch reverts

Try / catch

match child_field_result {
    Ok(_) => apply_revert(),
    Err(e) => Log::warn(format!("path {path} missing on child: {e:?}")),
}

Prevention

Validate the path on the concrete node type before reverting
Scope batch reverts to nodes sharing a type/schema
Re-save scenes after engine upgrades to refresh property paths

When it happens

Trigger: Calling revert_inheritable_property with a path not present on the child node — wrong node type, typo, or property renamed between engine versions / scene saves.

Common situations: Batch-reverting paths across heterogeneous nodes (path valid on one node type but not another), scenes edited across fyrox versions, script properties removed.

Understand the failure class

Background: 'Could not be found', 'does not exist', 'not found in database': the resource-not-found family when an ID, slug, key, or URI lookup comes back empty — this error's family across 20 libraries.

Related errors

AI-assisted analysis of FyroxEngine/Fyrox@76c91aad8e (2026-09-10). Data as JSON: /api/errors/afdca66f49466822. Report an issue: GitHub.

Appendix: source

Thrown at fyrox-graph/src/lib.rs:576

                    }
                    Err(e) => Log::err(format!(
                        "Failed to resolve parent path {path}. Reason: {e:?}"
                    )),
                });

            // Check whether the child's field is inheritable and modified.
            let mut need_revert = false;

            self.inner_mut()
                .resolve_path_mut(path, &mut |result| match result {
                    Ok(child_field) => {
                        if let Some(child_inheritable) = child_field.as_inheritable_variable_mut() {
                            need_revert = child_inheritable.is_modified();
                        } else {
                            Log::err(format!("Property {path} is not inheritable!"))
                        }
                    }
                    Err(e) => Log::err(format!(
                        "Failed to resolve child path {path}. Reason: {e:?}"
                    )),
                });

            // Try to apply it to the child.
            if need_revert {
                if let Some(parent_value) = parent_value {
                    let mut was_set = false;

                    let mut parent_value = Some(parent_value);

                    self.inner_mut().set_field_by_path(
                        path,
                        parent_value.take().unwrap(),
                        &mut |result| match result {
                            Ok(old_value) => {
                                previous_value = Some(old_value);

View on GitHub (pinned to 76c91aad8e)