Can't Get Single Element Properties when using getElementProperties api

[guanhuaming]

I wrote a test class, but when calling the PresentationManager.getElementProperties function, I couldn't retrieve the element's property information. I'm not sure where I went wrong, thank you for your help. Below is the code for the test class and the call:

// Test Class

export class PropertiesService {
  private _imodelfile: string;
  private _presentationManager: PresentationManager;
  private _imodel: IModelDb;
  private _elementClasses: string[];

  constructor(imodelfile: string, elementClasses: string[]) {
    this._imodelfile = imodelfile;
    this._elementClasses = elementClasses;
    this.init();
  }

  async retrieveElementProperties(elementId: string) {
    console.log(this._imodelfile);
    this._imodel = await SnapshotDb.openFile(this._imodelfile);
    const options: SingleElementPropertiesRequestOptions<IModelDb> = {
      imodel: this._imodel,
      elementId
    };
    const properties = await this._presentationManager.getElementProperties(options);
    return { elementId, properties };
  }

  private init() {
    Presentation.initialize({
      requestTimeout: 2000 * 60 * 1000,
      useSingleManager: true,
      caching: {
        content: { size: 10000 },
        // workerConnectionCacheSize: 32768000 * 100,
        hierarchies: { mode: HierarchyCacheMode.Memory }
      }
    });
    this._presentationManager = Presentation.getManager();
    this._presentationManager.rulesets().clear();
  }
}

// Test Code

  async retrieveElementProperties(ctx, _next) {
    const imodelGuidKeyName = Object.keys(ctx.params)[0];
    const elementIdName = Object.keys(ctx.params)[1];
    const imodelGuid = ctx.params[imodelGuidKeyName];
    const elementId = ctx.params[elementIdName];

    if (!imodelGuid || !elementId) {
      ctx.body = 'modelGuid、elementId不能为空';
    }
    const filepath = path.normalize(path.join(OUTPUT_DIR, imodelGuid, '0', `${imodelGuid}.bim`));
    const elementClasses = ['BisCore.GeometricElement2D', 'BisCore.GeometricElement3D'];
    const propertiesService = new PropertiesService(filepath, elementClasses);

    try {
      const propertyCategoriesData = await propertiesService.retrieveElementProperties(elementId);
      ctx.body = propertyCategoriesData;
    } catch (error) {
      propertiesService.dispose();
      ctx.body = `Retrieve Element's Properties error`;
    }
  }

[grigasp]

Hi, can you please be more specific what you mean by "couldn't retrieve the element's property information"?

• Are you getting an error? If yes, please show us the error message and a call stack, if any.
• Is the result different from what you expect? If yes, please explain what you expect and show what you get.

Thanks.

[guanhuaming]

@grigasp the elemntId I passed in is "0x153", and comfirmed that it is a valid id. see the bim file i uploaded above. Here's a screenshot:

[grigasp]

I can't reproduce this on master (see the test here). What version of itwinjs-core are you using?

[guanhuaming]

@grigasp my package.json's dependencies:

  "dependencies": {
    "@itwin/core-backend": "4.5.1",
    "@itwin/core-bentley": "4.5.1",
    "@itwin/core-common": "4.5.1",
    "@itwin/presentation-backend": "^4.5.1",
    "@itwin/presentation-common": "^4.5.1",
    "@koa/cors": "^5.0.0",
    "@koa/multer": "^3.0.2",
    "@koa/router": "^12.0.1",
    "dotenv": "^16.3.1",
    "koa": "^2.14.2",
    "koa-bodyparser": "^4.4.1",
    "koa-mount": "^4.0.0",
    "koa-static": "^5.0.0",
    "rimraf": "^3.0.2",
    "uuid": "^9.0.1"
  },
  "devDependencies": {
    "@types/jsonwebtoken": "^9.0.5",
    "@types/koa__multer": "^2.0.7",
    "@types/koa__router": "^12.0.4",
    "@types/koa-bodyparser": "^4.3.12",
    "@types/node": "^20.10.6",
    "@types/rimraf": "^3.0.0",
    "concurrently": "^8.2.2",
    "nodemon": "^3.0.2"
  }

[grigasp]

I rebased my branch on release/4.5.1 and the test still succeeds.

Now that I look at your initial post, I think the problem is this line:

this._presentationManager.rulesets().clear();

When a PresentationManager is created, it registers the rulesets it uses, including the "ElementProperties" one. Your call clears the registered rulesets list, so requesting content with "ElementProperties" ruleset ID results in no content.

[guanhuaming]

Thank you, just as you said! But I'm also sorry for taking up so much of your time.