リテンションの対象となるファイルバージョンを取得

curl -i -X GET "https://app.box.com/api/2.0/retention_policy_assignments/3424234/file_versions_under_retention" \
     -H "authorization: Bearer <ACCESS_TOKEN>"

BoxRetentionPolicyAssignment policyAssignment = new BoxRetentionPolicyAssignment(api, id);
Iterable<BoxFile.Info> fileVersionsUnderRetention = policyAssignment.getFileVersionsUnderRetention();
for (BoxFile.Info file : fileVersionsUnderRetention){
    BoxFileVersion version = file.getVersion();
    // Do something with the file version under retention.
}

retention_policy_assignment = client.retention_policy_assignment(assignment_id='12345').get()
file_versions_under_retention = retention_policy_assignment.get_file_versions_under_retention()
for file_version in file_versions_under_retention:
	print(f'The version {file_version.file_version.object_id} of {file_version.name} file is under retention for a retention policy assignment with ID {retention_policy_assignment.object_id}')

BoxCollectionMarkerBased<BoxFileVersion> fileVersionsUnderRetentionForAssignment = await client.RetentionPoliciesManager
    .GetFileVersionsUnderRetentionForAssignmentAsync("55555");

client.retentionPolicies
	.getFilesVersionUnderRetentionForAssignment('12345')
	.then((fileVersions) => {
		/* fileVersions -> {
			entries:
			[ {
				id: 123456,
				etag: 1,
				type: 'file_version',
				sequence_id: 3,
				name: 'Contract.pdf',
				sha1: '85136C79CBF9FE36BB9D05D0639C70C265C18D37',
				file_version: {
					id: 1234567,
					type: 'file_version',
					sha1: '134b65991ed521fcfe4724b7d814ab8ded5185dc',
				},
				applied_at: '2012-12-12T10:53:43-08:00' } ],
			limit: 1000,
			marker: 'some marker' }
		*/
	});

let iterator = client.retentionPolicy.listFileVersionsUnderRetentionForAssignment(retentionPolicyAssignmentId: "123456")
iterator.next { results in
    switch results {
    case let .success(page):
        for file in page.entries {
            print("File version \(file.fileVersion?.id ?? "")")
        }
        
    case let .failure(error):
        print(error)
    }
}