AIBridge Prefab Patch

Use prefab patch for complex Prefab asset edits that need multiple operations in one load/save cycle. Use inspector set_property for a single simple serialized field, and inspector set_properties for small batched field edits. Use gameobject、transform、inspector for scene objects. If the requested Prefab/Scene/custom .asset operation is not supported by AIBridge, load unity-yaml-editing and follow its direct UnityYAML rules.

$CLI means the platform-appropriate AIBridge CLI invocation, usually ./.aibridge/cli/AIBridgeCLI.exe on Windows.

参数选择

• Prefer --ops <file> for multi-step edits, nested JSON, arrays, references, or anything run from PowerShell.
• Use --ops-json <json> only for one or two very small operations.
• Put temporary operation files under .aibridge/patch_ops/.
• Always run --dryRun true before writing the prefab.

标准流程

1. Find the target prefab with asset find/search --format paths.
2. Inspect structure with prefab get_hierarchy --prefabPath "<prefab>".
3. Create .aibridge/patch_ops/<task>.json.
4. Run dry-run:

$CLI prefab patch --prefabPath "Assets/Prefabs/Player.prefab" --ops ".aibridge/patch_ops/player_hp_patch.json" --dryRun true

5. If dry-run succeeds, run the same command without --dryRun true.
6. Re-check hierarchy/properties, then run compile unity and get_logs --logType Error.

操作示例

[
  { "op": "ensure_child", "path": "Player/HP" },
  { "op": "ensure_component", "path": "Player/HP", "typeName": "Animator" },
  {
    "op": "set_property",
    "target": { "path": "Player/HP", "componentName": "Animator" },
    "propertyName": "m_Enabled",
    "value": true
  },
  {
    "op": "set_array",
    "target": { "path": "Player", "componentName": "YourComponent" },
    "propertyName": "items",
    "items": [
      { "key": "HP", "value": { "$gameObject": "Player/HP" } },
      {
        "key": "HPAnimator",
        "value": {
          "$component": { "path": "Player/HP", "typeName": "Animator" }
        }
      }
    ]
  }
]

支持的操作

• ensure_child: Ensure a GameObject path exists. Optional fields: active, tag, layer.
• ensure_component: Ensure a component exists on path. Use typeName.
• set_property: Set one SerializedProperty on a GameObject/component/asset target.
• set_properties: Set multiple SerializedProperties on one target.
• set_array: Replace an array property.
• append_array: Append items to an array property.
• clear_array: Clear an array property.

不支持时的处理

prefab patch currently does not cover every Unity serialized structure. Use unity-yaml-editing when the task needs unsupported operations such as:

• Scene .unity object creation or structure edits not exposed by scene/gameobject/transform/inspector commands.
• Prefab Variant override structures, nested modification records, or operations outside the listed patch ops.
• Creating a brand-new Prefab file from text serialization, including paired .meta, root object, child hierarchy, and component documents.
• Adding Prefab documents/components whose schema is not covered by patch ops, after copying the shape from the same Unity version/project.
• ScriptableObjectTable/custom .asset creation or structural edits that cannot be represented by Inspector SerializedProperty writes.
• Other text-serialized Unity assets (.mat, .controller, .anim, etc.) requiring direct document/fileID/GUID changes.

引用写法

Use these object reference values inside value or array items:

{ "$gameObject": "Player/HP" }
{ "$component": { "path": "Player/HP", "typeName": "Animator" } }
{ "$asset": "Assets/Materials/HPMat.mat" }
{ "$guid": "asset-guid" }
null

注意事项

• Do not edit Prefab YAML directly unless no Unity/AIBridge API path exists; when required, use unity-yaml-editing.
• For direct YAML fallback, copy component schema from a same-project example, update every GameObject.m_Component, Transform.m_Children, Transform.m_Father, and component m_GameObject reference, then re-import and inspect.
• Paths are normalized against the prefab root; both Root/Child and Child can work when unambiguous.
• Duplicate child names under the same parent are ambiguous; use exact hierarchy paths.
• Duplicate components of the same type are ambiguous; use componentIndex when needed.
• Keep operation JSON under .aibridge/patch_ops/; do not put it under Assets/ or commit it.

References

• references/prefab-reference.md: generated CLI reference for general prefab commands.