Command with Fauna Sub Requests

command definition.js

// POST /commands result
{
  "resource" : {
    "ref" : "commands/reply_message",
    "ts" : 1357900098422864,
    "name" : "reply_message",
    "comment" : "Reply a Message",
    "actions" : [ {
      "method" : "POST",
      "path" : "/v0/instances",
      "body" : {
        "class" : "message",
        "data" : {
          "body" : "$body"
        }
      }
    }, {
      "method" : "POST",
      "path" : "/v0/classes/message/timelines/chat/",
      "body" : {
        "resource" : "${$0.resource.ref}"
      }
    } ],
    "deleted" : false
  },
  "references" : { }
}

// result:

{
  "error" : "Bad Request",
  "param_errors" : {
    "resource" : "Invalid resource ref."
  }
}

If I change it to:

"resource" : "$0.resource.ref"

Then the results is:

{
  "error" : "Bad Request",
  "param_errors" : {
    "resource" : "Failed to find element resource in 'JSON({\n  \"ref\" : \"instances/22692978309988352\",\n  \"ts\" : 1357900560578670,\n  \"class\" : \"message\",\n  \"user\" : \"users/20679000498110464\",\n  \"references\" : { },\n  \"data\" : { },\n  \"deleted\" : false\n})'"
  }
}

Now check my next comment...

Notice how it's actually creating the resource:

\"ref\" : \"instances/22692978309988352\"

but it seems it couldn't find element "resource".... so I change it to:

"resource" : "$0.ref"

then it returns:

{
  "error" : "Not Found"
}

This one is a little hard to debug, there is no detail in the error. Why is the reference not valid?

This is our fault. Fixing.