Gfilui

I have an attribute in lightning component:

<aura:attribute name="pricingRecommendationListDetailsData" access="PUBLIC" type="list" default="object" />

Data stored in it visible as:

accRecmId: "a07e000", category: "test", Price: 56, PriceRange: …, cost: 0.3, …

Now I need to pass this attribute as parameter to apex controller on button click.And I need to iterate over values such as accRecmId in apex class

you have two option:

1. Send only the accRecmId to your Server method like this:

JS Controller:

var selectedList = component.get('v.pricingRecommendationListDetailsData');

 var ids=new Array();
 for (var i= 0 ; i < selectedList.length ; i++)
 ids.push(selectedList[i].accRecmId);
 

 var idListJSON=JSON.stringify(ids);

 var action = component.get("c.callServier");
 action.setParams(
 "accRecmId":idListJSON
 );

Apex Controller:

public static void callServier(String accRecmId) 
 Type idArrType = Type.forName('List<string>');
 List<string> wrapperList = (List<string>) JSON.deserialize(accRecmId, idArrType);

2. Pass all attribute to your apex controller and inside your apex controller get the accRecmId.

My recommendation is to prepare the required data on the client and send only the list of ids you have to work within the server:

MyComponentController.js

// get the list of pricing details
var pricingDetails = component.get('v.pricingRecommendationListDetailsData');
// map through the list to create a list of acc rec ids
var accRecmIds = pricingDetails.map(function (detail) 
 return detail.accRecmId;
);

// get the server call action
var action = component.get("c.iterateOverAccRecmIds");
// set the list of acc rec ids as a parameter
action.setParams(
 "accRecmIds":accRecmIds
);

MyComponentController.cls

public with sharing class MyComponentController 
 @AuraEnabled
 public static void iterateOverAccRecmIds(List<String> accRecmIds) 
 // do what you want with the list of ids...