Convert esq.getEntityCollection to list of lookup values (Terrasoft.DataValueType.LOOKUP)

Hi,

I have a field on a detail that I want to filter by another lookup on a different detail. 

(There is a detail: school in project on the project page. Users can pick multiple schools. Inside another detail on the project page, Project event detail, I have another detail called school in Project Event. I want to school lookup to only show values that were picked by the first detail, school in project.

I set an attribute and create function to get the list of schools via esq.

I don't know how to convert the schools list to a list I can use to return on the filter of the attribute.

		attributes: {
 
			 "UsrSchool": {
                dataValueType: this.Terrasoft.DataValueType.LOOKUP,
                "lookupListConfig": {
                    "filters": [
                        function() {
							console.log("att of school filter got here!");
							var schoolsList;
                            	var EventId = this.get("MasterRecordId");
				if (EventId) {
					var esq = Ext.create("Terrasoft.EntitySchemaQuery",{
						rootSchemaName: "UsrUsrSchoolInProject",
					});
					//project
					esq.addColumn("UsrLookup1");
					//school
					esq.addColumn("UsrLookup2");
					var esqFilter = Terrasoft.createColumnFilterWithParameter(
						this.Terrasoft.ComparisonType.EQUAL,"UsrLookup1",EventId);
					esq.filters.add(esqFilter);
					esq.getEntityCollection(function(result){
						result.collection.each(function (item) {
                // setting received account from detail to a variable
							var account = item.get("UsrLookup2").value;
							console.log("school 1 - ",account);
							schoolsList.Add(account);
						});
						return schoolsList;
					});
 
				}
                        }
                    ]
                }

 diff: /**SCHEMA_DIFF*/[

				"operation": "insert",
				"name": "UsrSchool52cebb58-4d96-4c3b-8737-2474daf56728",
				"values": {
					"layout": {
						"colSpan": 12,
						"rowSpan": 1,
						"column": 0,
						"row": 1,
						"layoutName": "Header"
					},
					"bindTo": "UsrSchool"
				},
				"parentName": "Header",
				"propertyName": "items",
				"index": 1
			}

Thanks in advance,

Chani