Filter Query Spec for Catalog API

[frankbharath]

We are fetching catalogs for all the participants using Catalog API with the query spec. We tried to filter the assets with id which is working fine and below is the query spec we are sending as part of the request,
{ "@context": { "@vocab": "[https://w3id.org/edc/v0.0.1/ns/"](https://w3id.org/edc/v0.0.1/ns/%22) }, "@type": "QuerySpec", "filterExpression": [ { "operandLeft": "datasets.id", "operator": "=", "operandRight": "hello-eonax-v1" } ] }
Our need is we want to filter assets using other properties like name or any custom attribute while we added it when we created an asset. Some examples we used to filter the data assets,
{ "@context": { "@vocab": "[https://w3id.org/edc/v0.0.1/ns/"](https://w3id.org/edc/v0.0.1/ns/%22) }, "@type": "QuerySpec", "filterExpression": [ { "operandLeft": "datasets.name", "operator": "=", "operandRight": "asset name" } ] }

{ "@context": { "@vocab": "[https://w3id.org/edc/v0.0.1/ns/"](https://w3id.org/edc/v0.0.1/ns/%22) }, "@type": "QuerySpec", "filterExpression": [ { "operandLeft": "datasets.customProperty", "operator": "=", "operandRight": "some value" } ] }

but the above mentioned query spec is not working. How can we filter the data asset using properties apart from the id field?

[paullatzelsperger]

datasets is of type List<Dataset> and that does not have a name property. Instead, Dataset has an extensible field called properties, in which the name would be stored, so the query expression left operand would have to be

datasets[0].properties.'https://w3id.org/edc/v0.0.1/ns/name'.

Unfortunately, we do not support queries that inspect every dataset like datasets[].properties.... yet.

[frankbharath]

Thanks for the response. So is this something that can be implemented in the future version, would you like us to raise new feature request?