Running a chain for each Document in a DocumentList (Have casting issues)

Hi! I'm working on an automation chain in studio, and I'm running into an issue on trying to recursively apply a RunDocumentOperation operation to each document returned from a query.

The general structure is I have this contextual user action, when pressed, it will query documents that were modified within a set date range. For each of these modified documents, I'd like to run a specific automation chain (the same one for each document). So my starter chain looks like this:

Automation Chain Name: ac_find_modified

- Repository.Query:
    query: "SELECT * FROM Document WHERE dc:modified BETWEEN DATE '2018-10-10' AND DATE '2018-10-15'"
    language: NXQL
    sortOrder: ASC
- RunDocumentOperation:
    id: my_test_chain
    isolate: "false"
    rollbackGlobalOnError: "false"

What happens is that the query operation returns a DocumentList type, which I believed was okay to perform the RunDocumentOperation (according to the solution from this: https://answers.nuxeo.com/general/q/ae6a0c4c46f24bb3a317a075f056d95f/How-to-recursivly-apply-an-automation-chain-to-a-document-and-to-its-children-and-the-children-of-its-children-and )

However what I observed is after the query search, it would proceed to run the first document of the results through the “my_test_chain” automation chain and finish. However after finishing, it errors with the following

****** end sub chain ******


    at org.nuxeo.ecm.automation.core.impl.OperationServiceImpl.run(OperationServiceImpl.java:238)
    at org.nuxeo.ecm.automation.core.impl.OperationServiceImpl.run(OperationServiceImpl.java:97)
    at org.nuxeo.ecm.automation.jsf.OperationActionBean.runOperation(OperationActionBean.java:94)
    at org.nuxeo.ecm.automation.jsf.OperationActionBean.doOperation(OperationActionBean.java:69)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
.....
.....
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:748)
Caused by: org.nuxeo.ecm.automation.OperationException: Failed to invoke operation RunDocumentOperation with aliases [Context.RunDocumentOperation]
    at org.nuxeo.ecm.automation.core.impl.InvokableMethod.invoke(InvokableMethod.java:189)
    at org.nuxeo.ecm.automation.core.impl.CompiledChainImpl.doInvoke(CompiledChainImpl.java:130)
    at org.nuxeo.ecm.automation.core.impl.CompiledChainImpl.invoke(CompiledChainImpl.java:116)
    at org.nuxeo.ecm.automation.core.impl.CompiledChainImpl.doInvoke(CompiledChainImpl.java:133)
    at org.nuxeo.ecm.automation.core.impl.CompiledChainImpl.invoke(CompiledChainImpl.java:116)
    at org.nuxeo.ecm.automation.core.impl.OperationServiceImpl.run(OperationServiceImpl.java:214)
    ... 105 more
Caused by: java.lang.ClassCastException: org.nuxeo.ecm.core.api.impl.DocumentModelListImpl cannot be cast to org.nuxeo.ecm.core.api.DocumentModel
    at org.nuxeo.ecm.automation.core.operations.execution.RunDocumentChain.run(RunDocumentChain.java:95)
    at org.nuxeo.ecm.automation.core.operations.execution.RunDocumentChain.run(RunDocumentChain.java:123)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.nuxeo.ecm.automation.core.impl.InvokableMethod.doInvoke(InvokableMethod.java:171)
    at org.nuxeo.ecm.automation.core.impl.InvokableMethod.invoke(InvokableMethod.java:177)
    ... 110 more

If it helps, the header of the automation chain traceback in the logs was:

****** chain ******
Name: ac_find_modified
Exception: OperationException
Caught error: Failed to invoke operation RunDocumentOperation with aliases [Context.RunDocumentOperation]
Caused by: java.lang.ClassCastException: org.nuxeo.ecm.core.api.impl.DocumentModelListImpl cannot be cast to org.nuxeo.ecm.core.api.DocumentModel
****** Hierarchy calls ******
    org.nuxeo.ecm.automation.core.operations.services.query.DocumentPaginatedQuery
        org.nuxeo.ecm.automation.core.operations.execution.RunDocumentChain

I just wanted to make sure this is the procedure to perform if you simply want to apply one automation chain to every document returned from a query. I'm kinda confused on why it actually processes the first element, but procedures to error after the first run? Another note is that the “my_test_chain” does start with Context.FetchDocument , which I was wondering maybe that is responsible since the error complains about casting a DocumentList to a Document and it is expecting a Document. However I read the description and said:

“Fetch the input of the context as a document or list of documents. The document will become the input for the next operation.”

So it sounds like it should accept a list as well. So is it actually the RunDocumentOperation from my “ac_find_modified” chain?

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