Hi — I want to filter a query by a list of task references, is there some way I can do that? The below fails.

query GET_COMMUNICATIONS($taskRef: [String!]!) {
  CommunicationList(based_on: $taskRef) {
    resourceType
    id
  }
}

Link: https://graphiql.medplum.com/?query=cXVlcnkgR0VUX0NPTU1VTklDQVRJT05TKCR0YXNrUmVmOiBbU3RyaW5nIV0hKSB7CiAgICBDb21tdW5pY2F0aW9uTGlzdChiYXNlZF9vbjogJHRhc2tSZWYpIHsKICAgICAgcmVzb3VyY2VUeXBlCiAgICAgIGlkCiAgICAgIHN0YXR1cwogICAgICB0b3BpYyB7CiAgICAgICAgaWQKICAgICAgfQogICAgICByZWNpcGllbnQgewogICAgICAgIGlkCiAgICAgIH0KICAgICAgc2VuZGVyIHsKICAgICAgICBpZAogICAgICB9CiAgICAgIHNlbnQKICAgICAgbm90ZSB7CiAgICAgICAgdGV4dAogICAgICB9CiAgICB9CiAgfQ%3D%3D&variables=ewogICJ0YXNrUmVmIjogWyJUYXNrLzEyMyJdCn0%3D&operationName=R0VUX0NPTU1VTklDQVRJT05T

Hi @jasonwa.ng , unfortunately the FHIR GraphQL doesn't support AND queries using this syntax, but you can use the

_filter

search parameter to achieve the same effect

What about if we want an OR query?

Yes, this is a default capability of FHIR search. https://www.medplum.com/docs/search/basic-search#searching-multiple-criteria