Re: Getting one value from collection attribute

VladiSlav · ‎Jul 09, 2020

Hello everyone!

I get information from the server using the OData REST API.
I have a global attribute, which is a collection:

I want the server to return only one value from the collection when requested. In the request, I want to specify a value that will determine the desired collection value.

I understand that such logic can not be written in the request. Therefore, I tried to implement this in the JavaScript domain file.

I thought that it should be a function that first receives the values of the collection attributes from Windchill, matches them, and then uses the value passed to the function as a key and returns the desired value.

I saw that in JavaScript you can use classes from Java:

var EntityAttribute = Java.type('com.ptc.odata.core.entity.property.EntityAttribute');

But I do not know how to use the code to get the values of global attributes.

I did not find documentation for odataWeb.jar (com.ptc.odata...) library.
Tell me, please, how can I do this?
Thank you in advance!
Best Regards!

DmitryC · ‎Jul 09, 2020

Hi VladiSlav,

Are you trying to search for parts by the value of this collection?

Have you tried the filter?

/Windchill/servlet/odata/ProdMgmt/Parts?$filter=contains(ThisAttr,'36')

Keep in mind that the response might be in XML or JSON format, to request it as a JSON just include it in your request header.

Here is a JS example of an async function that looks for a part by number:

function getWcPartByNumber(number, callback) {		
  let filter = "$filter=Number eq '" + number + "'";
  let orderBy = "$orderby=Revision desc";
  let filterUrl = wcHost + "/Windchill/servlet/odata/ProdMgmt/Parts?" + filter + "&" + orderBy;
		
  let xhttp = new XMLHttpRequest();
  xhttp.onreadystatechange = function() {
    if (this.readyState == 4 && this.status != 200) {
      callback(this.statusText, this);
    }
    if (this.readyState == 4 && this.status == 200) {
      callback(null, this);
    }
  };
	
  xhttp.open("GET", filterUrl, true);
  xhttp.setRequestHeader("Content-type", "application/json; charset=utf-8");
  xhttp.setRequestHeader("dataType", "json");
  xhttp.setRequestHeader("Prefer", "odata.maxpagesize=200");
  xhttp.send(null);	
}

And here is a call for this function with the following parsing of the response and a check if this collection of yours contains a certain value:

getWcPartByNumber (wtPartNumber, function(err, data) {
  if (err != null) {
    alert (err);
  } else {
    let dataObj = JSON.parse(data.responseText);

    if (dataObj.value.length != 0 && dataObj.value[0].ThisAttr.includes(36)) {
      // Do Something
    }
  }
});

With XML response it should be somewhat similar.

Kind regards,

Dmitry.

DmitryC · ‎Jul 09, 2020