I want to customize the nuxeo-data-table that shows nuxeo-results in nuxeo-assets-search-results.html by adding a new column which displays a property of a parent document. I'm asking a solution to access to a parent document data in such widget. I' ve tried to get the parent data using a function that call the operation “Document.getParent” and return the property I need. In fact, I've added a new column that calls this function :

         <template>
        [[_getProperty(item)]]
        </template>
  </nuxeo-data-table-column>

function I used :

_getProperty: function(item) {

        this.currentItemId = item.uid;
        if (this.currentItemId != null && this.currentItemId != undefined) {
          this.$.fetchDocumentOperation
            .execute()
            .then(function(response) {
                this.input = response;
                if (this.input != null && this.input != undefined) {
                   this.$.getParentOperation.execute().then(function(response2) {
                      console.log(response2.properties["xpath"]);
                      return response2.properties["xpath"];
                   }.bind(this))
                   .catch(function(error) {
                     console.log("error:" + error);
                   }.bind(this));
                 }
               }.bind(this))
             .catch(function(error) {
                console.log("error:" + error);
             }.bind(this));

By this solution I was able to display the property I need in console but it's not displayed in interface.