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I wrote an endpoint in my API that queries specific parameters in the client's model using the endpoint described here

In general it works great - my problem lies with how the parameters need to be queried: the basic ones can be queried directly, while for the others you need to give an exact (with possible wildcards) path:

"fields": [
    "objectid",
    "name",
    "externalId",
    "properties.Analytical Properties"
    ...
]

the problem specifically is the Standard Revit Category, which usually contains a simple string such as 'Revit Wall'. When querying the Viewer/Model itself, I can find the property without any difficulties, but no matter what I enter into the "fields" array, I'm unable to obtain that Category value.

NOTE: selecting an element in the viewer and showing its properties also does not show this parameter, it only shows when querying the model.

the queried parameter 'Category' in the Revit model - seemingly unattainable via the API

edit:

the same wall when queried via properties endpoint API

As you can see, the first few parameters that appear in the first image can't be found in the second one, even when using the JSON-style path withe the corresponding displayCategory __category__

Manuel Gasteiger
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  • In this blog, we described the property structure and how to build the query. Basically, a JSON-path styled key will be composed like properties.{category}.{property} The space is accepted. https://aps.autodesk.com/blog/advanced-query-model-derivative-api Are you following the format already? if it does not help, could you share a demo properties for us to diagnose? – Xiaodong Liang Apr 09 '23 at 09:43
  • @XiaodongLiang Hi, thank you for your reply, I followed your blog and the JSON-path styled key works perfectly for all regular parameters. I can provide a Revit Model / URN and modelGuid, but it seems that all RevitModels uploaded to forge and queried via the advanced model derivative API don't have the option to return the standard Revit Category Parameter. I tested the regular _Get Properties_ endpoint on my model as well and was unable to retrieve the parameter in question. according to the Blog, the JSON-path should be: **'properties.__category__.Category'** i will update my post – Manuel Gasteiger Apr 12 '23 at 06:09

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