Im completely new to lighting so I get stuck quite easily. I have looked online for examples but found none. I have created a lightning accordion that uses an aura iteration to display a list of records loaded during the init method. I am able to see the records and expand them just fine. The problem is that I need to be able to read the currently expanded accordionSection and retrieve the record that is displayed there from another component in the same page. Code is as follows:

<aura:component controller="ScheduleController" implements="flexipage:availableForRecordHome,force:hasRecordId" >
    <aura:handler name="init" action="{!c.doInit}" value="{!this}"/>
    <aura:attribute name="schedule" type="List"/>
    <!--<aura:registerEvent name="setLPTsListView" type="c:LPTsResult"/>-->

    <lightning:accordion aura:id="schedAccordion" onsectiontoggle="{!c.setLPTsListView}" ><!--"{!setLPTsListView}"-->
        <aura:iteration aura:id="schedIteration" items="{!v.schedule}" var="sched" indexVar="indx">
            <lightning:accordionSection name="{!indx}" label="{!sched.Sched_Name__c + ' - ' + sched.Schedule_Type__c}">
                <aura:set attribute="body">
                    <p><b>Due Date</b> : {!sched.Due_Date__c} </p>
                    <p><b>Effective Date</b> : {!sched.Effective_Date__c} </p>

component controller

    // Load schedule from Salesforce - this works fine
    doInit: function(component, event, helper) {
        // Create the action
        var action = component.get("c.getSchedule"); 
        var recId = component.get("v.recordId");
        action.setParams({ pLoanId : component.get("v.recordId") });

        // Add callback behavior for when response is received
        action.setCallback(this, function(response) {
            var state = response.getState();
            if (state === "SUCCESS") {
                component.set("v.Schedule", response.getReturnValue());
                console.log(' Schedule: ' + JSON.stringify(component.get("v.Schedule")));
            else {
                console.log("Failed with state: " + state);
        // Send action off to be executed

    //here is where im stuck!!! this method is called when the accordionsections are toggled
    setLPTsListView: function(component, event, helper) {

        //here i need to be able to get the "indx" variable relating to the current expanded accordionSection and pass in the 
        //schedule record to the schedulePayments component (further below in post)

schedulePayments component
<aura:component implements="flexipage:availableForRecordHome,force:hasRecordId" >
        IT SHOULD ONLY INCLUDE LPTs FROM THE CURRENT SCHEDULE RECORD IN THE ACCORDION COMPONENT (which already has child records so dont need to query them, just pass them into here-->
    <aura:attribute name="LPTs" type="List"/> 

    <!-- SCHEDULE LPTs-->
    <aura:iteration items="{!LPTs}" var="lpt">
        <lightning:card variant="Narrow" title="{!lpt.Name}" iconName="standard:Schedule__c">
            <p class="slds-p-horizontal_small">

all i need is some examples where i can read up and figure out how to get the expanded accordionsection with the schedule and the related LPT data (its a child record of the schedule and is included in the doInit methods initial schedule query.


You can get this directly from the event when it fires.

setLPTsListView: function(component, event, helper) {
  var openSections = event.getParam("openSections");

You can also read the activeSectionName attribute directly:

setLPTsListView: function(component, event, helper) {
    var openSections = component.find("schedAccordion").get("v.activeSectionName");

If allowMultipleSectionsOpen is true, this attribute is an array, otherwise it is a String.

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