Returning Data to LWC: Wrapper Classes and DTOs

@AuraEnabled
public static List<Account> getAccounts() {
    return [SELECT Id, Name, Industry FROM Account];
}

1. @AuraEnabled — marks the method.
2. public static List<Account> getAccounts() { — for a component that just needs to display real Account fields directly.
3. return [SELECT Id, Name, Industry FROM Account]; — returning the queried sObject List is simple and works fine — exactly like every SOQL example since Module 20.
4. } — closes the method.

public class AccountSummary {
    @AuraEnabled public String name;
    @AuraEnabled public Integer openOpportunityCount;
    @AuraEnabled public Decimal totalWonRevenue;
}

@AuraEnabled
public static List<AccountSummary> getAccountSummaries() {
    List<AccountSummary> summaries = new List<AccountSummary>();

    for (Account acc : [SELECT Id, Name, Total_Won_Revenue__c, (SELECT Id FROM Opportunities WHERE IsClosed = false) FROM Account]) {
        AccountSummary summary = new AccountSummary();
        summary.name = acc.Name;
        summary.openOpportunityCount = acc.Opportunities.size();
        summary.totalWonRevenue = acc.Total_Won_Revenue__c;
        summaries.add(summary);
    }

    return summaries;
}

1. public class AccountSummary { — this is Module 16's wrapper-class pattern, applied at the LWC boundary.
2. @AuraEnabled public String name; — a real field.
3. @AuraEnabled public Integer openOpportunityCount; — a computed value.
4. @AuraEnabled public Decimal totalWonRevenue; — a rollup (Module 26).
5. } — closes the wrapper class.
6. (blank line)
7. @AuraEnabled — marks the method.
8. public static List<AccountSummary> getAccountSummaries() { — returns the wrapper, not a raw sObject.
9. List<AccountSummary> summaries = new List<AccountSummary>(); — collects the results.
10. (blank line)
11. for (Account acc : [SELECT Id, Name, Total_Won_Revenue__c, (SELECT Id FROM Opportunities WHERE IsClosed = false) FROM Account]) { — the child-relationship subquery, Module 20.
12. AccountSummary summary = new AccountSummary(); — builds one wrapper per account.
13. summary.name = acc.Name; — the real field.
14. summary.openOpportunityCount = acc.Opportunities.size(); — the computed value, from the subquery.
15. summary.totalWonRevenue = acc.Total_Won_Revenue__c; — the rollup.
16. summaries.add(summary); — collects it.
17. } — closes the loop.
18. (blank line)
19. return summaries; — hands back a shape no single query alone could return directly, tailored to exactly what a dashboard component needs to display.
20. } — closes the method.

Notice @AuraEnabled appears on the fields of AccountSummary, not just the method — each field the UI needs to read must be individually exposed too, the same annotation-based exposure principle from Lesson 2, now applied one level deeper.