Task 3 - Get Element Instances of a Particular Type
In this task, you will learn how to retrieve all instances of a particular type from a Design at Tip. Additionally, you can request for select properties like Area, Volume, etc. of these instances and its type to be returned. Let us try to retrieve all basic wall instances of the type ‘Foundation – 24’’ Concrete’ from the Snowdon Towers Sample Architecture.rvt’
By the end of this task, you will be able to:
- Fetch Instance Elements of a Type using
referencedBy(name: “Type”) relationship and ``propertyFilter ``to define the Category ‘Walls’ & Type ‘Foundation – 24’’ Concrete’. - Return only the properties that you need. For example: Area, Volume, Element Context, Element Name.
- Use advance operators like contains, and, etc.
You will use the following queries in this task:
| Type | Operation | Description |
|---|---|---|
| Query | elements | Retrieves element from given design, using additional RSQL filters. |
Step 1: Request for a list of elements in a Design
The elements query returns an Elements object.
- In AEC Data Model Explorer, the query is populated by default in the Query Pane. You can also edit or update the query as per your requirement and run it.
Query
query ($designId: ID!, $propertyFilter: String!) { elements( designId: $designId filter: {query: $propertyFilter} pagination: {limit: 5} ) { pagination { cursor } results { id name properties { results { name value } } referencedBy(name: "Type") { pagination { cursor } results { id name alternativeRepresentations { externalElementId } properties { results { name value } } } } } } }Show MoreQuery Variables
- In the Query Variables Pane, replace the value of the
designIdvariable with the design ID that you used in task 3 of previous tutorial. - In the Query Variables Pane, replace the value of the
property filter ``with the property filter of your choice. For ease of understanding, we have used ``"'property.name.category'=contains=Walls and 'property.name.Element Context'==Type and 'property.name.Element Name'=contains='Foundation - 24'"
Note: To know about the list of supported metadata filtering options, refer Advanced Filtering Capabilities page.
{ "designId": "YWVjZH5VRnpaOEdTSjBvSjYyMGN5d2VKbVFqX0wyQ35Fd2RubEZlSVI5Mi1zaHlGQ0pqaDJ3", "propertyFilter": "'property.name.category'=contains=Walls and 'property.name.Element Context'==Type and 'property.name.Element Name'=contains='Foundation - 24'" } - In the Query Variables Pane, replace the value of the
- Click Play. The list of elements with its tip ID and name will appear in the response.
The response should be similar to the following code-block:
Response
{ "data": { "elements": { "pagination": { "cursor": null }, "results": [ { "id": "YWVjZX5VRnpaOEdTSjBvSjYyMGN5d2VKbVFqX0wyQ35Fd2RubEZlSVI5Mi1zaHlGQ0pqaDJ3XzEyYTFiNQ", "name": "Foundation - 24\" Concrete", "properties": { "results": [ { "name": "Description", "value": null }, { "name": "Manufacturer", "value": null }, { "name": "Model", "value": null }, { "name": "Type Comments", "value": null }, { "name": "Type Image", "value": null }, { "name": "URL", "value": null }, { "name": "Absorptance", "value": 0.7 }, { "name": "Roughness", "value": 3 }, { "name": "Thermal Mass", "value": 921166.5599999999 }, { "name": "Thermal Resistance (R)", "value": 0.582791586998088 }, { "name": "Coarse Scale Fill Color", "value": 0 }, { "name": "Design Option", "value": "Main Model" }, { "name": "Cost", "value": null }, { "name": "External ID", "value": "9bd3aa6c-2785-4080-985d-83d6cac9401d-0012a1b5" }, { "name": "Fire Rating", "value": "4 HR" }, { "name": "Function", "value": 2 }, { "name": "Export Type to IFC", "value": "Default" }, { "name": "Export Type to IFC As", "value": null }, { "name": "Type IFC Predefined Type", "value": null }, { "name": "Type IfcGUID", "value": "2Rqwfi9uL0W9XTWzRAs_6e" }, { "name": "Keynote", "value": null }, { "name": "Revit Category Type Id", "value": "Walls" }, { "name": "Family Name", "value": "Foundation - 24\" Concrete" }, { "name": "Element Name", "value": "Foundation - 24\" Concrete" }, { "name": "Element Context", "value": "Type" }, { "name": "Revit Element ID", "value": 1221045 }, { "name": "Assembly Code", "value": "A1010200" }, { "name": "Assembly Description", "value": "Foundation Walls" }, { "name": "Width", "value": 0.6096 }, { "name": "Type Mark", "value": "C04" }, { "name": "Wrapping at Ends", "value": "None" }, { "name": "Wrapping at Inserts", "value": "Do not wrap" } ] }, "referencedBy": { "pagination": { "cursor": null }, "results": [ { "id": "YWVjZX5VRnpaOEdTSjBvSjYyMGN5d2VKbVFqX0wyQ35Fd2RubEZlSVI5Mi1zaHlGQ0pqaDJ3Xzk3NDY1", "name": "Foundation - 24\" Concrete", "alternativeRepresentations": { "externalElementId": "50f92000-82f8-4258-b6a8-bb42c01b00a0-00097465" }, "properties": { "results": [ { "name": "Image", "value": null }, { "name": "Comments", "value": null }, { "name": "Length", "value": 14.389100000000056 }, { "name": "Design Option", "value": "Main Model" }, { "name": "Mark", "value": null }, { "name": "External ID", "value": "50f92000-82f8-4258-b6a8-bb42c01b00a0-00097465" }, { "name": "Area", "value": 50.7037695600002 }, { "name": "Volume", "value": 30.909017923776116 }, { "name": "Export to IFC", "value": "By Type" }, { "name": "Export to IFC As", "value": null }, { "name": "IFC Predefined Type", "value": null }, { "name": "IfcGUID", "value": "1G_I00WlX2MBQekqB04dJ5" }, { "name": "Revit Category Type Id", "value": "Walls" }, { "name": "Family Name", "value": "Basic Wall" }, { "name": "Element Name", "value": "Foundation - 24\" Concrete" }, { "name": "Element Context", "value": "Instance" }, { "name": "Related to Mass", "value": false }, { "name": "Revit Element ID", "value": 619621 }, { "name": "Room Bounding", "value": true }, { "name": "Base Offset", "value": -0.1524 }, { "name": "Base Extension Distance", "value": 0 }, { "name": "Base is Attached", "value": false }, { "name": "Cross-Section", "value": "Vertical" }, { "name": "Location Line", "value": 2 }, { "name": "Structural", "value": false }, { "name": "Structural Usage", "value": 0 }, { "name": "Top Extension Distance", "value": 0 }, { "name": "Top is Attached", "value": false }, { "name": "Top Offset", "value": 0 }, { "name": "Unconnected Height", "value": 3.5052000000000003 } ] } }, { "id": "YWVjZX5VRnpaOEdTSjBvSjYyMGN5d2VKbVFqX0wyQ35Fd2RubEZlSVI5Mi1zaHlGQ0pqaDJ3Xzk3NDY2", "name": "Foundation - 24\" Concrete", "alternativeRepresentations": { "externalElementId": "50f92000-82f8-4258-b6a8-bb42c01b00a0-00097466" }, "properties": { "results": [ { "name": "Image", "value": null }, { "name": "Comments", "value": null }, { "name": "Length", "value": 3.162299999999996 }, { "name": "Design Option", "value": "Main Model" }, { "name": "Mark", "value": null }, { "name": "External ID", "value": "50f92000-82f8-4258-b6a8-bb42c01b00a0-00097466" }, { "name": "Area", "value": 10.550301479999995 }, { "name": "Volume", "value": 6.431463782207994 }, { "name": "Export to IFC", "value": "By Type" }, { "name": "Export to IFC As", "value": null }, { "name": "IFC Predefined Type", "value": null }, { "name": "IfcGUID", "value": "1G_I00WlX2MBQekqB04dJ6" }, { "name": "Revit Category Type Id", "value": "Walls" }, { "name": "Family Name", "value": "Basic Wall" }, { "name": "Element Name", "value": "Foundation - 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}
}
- Click Viewer to view the preview of the model.
After working through the steps mentioned above, you should see a screen similar to the following image:
