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I have a list accountList which contains corresponding contacts aswell. Now I am trying to make a map from that list with key as single account and corresponding associated contacts as value.

public class ListToMapConversion {
   public list<Account> accountList =new list<account>();
    public map<Account,contact> accmap=new map<Account,contact>();
    public void convert(){
        accountlist=[select id,name,(select lastName,phone,email from contacts) from account];

        for(Account a:accountlist){
            accmap.put(a,a.contacts);
        }

        system.debug(accmap);
    }


}

  • So what's your problem exactly? Generally, using SObjects as keys in a Map is not a good practice due to performance issues and keys must be immutable. Use Account Id instead – Eduard Aug 14 '18 at 9:50
  • getting an error saying that list has no rows. But when I execute the query in the query editor am getting records – user59277 Aug 14 '18 at 9:52
  • 2
    That error couldn't occur here. Your problem is elsewhere. – sfdcfox Aug 14 '18 at 10:22
  • not getting any records to display after its executed. no errors as well – user59277 Aug 15 '18 at 9:09
1

Since a.contacts returns the List<Contact> so, variable declaration needs to be changed as follows:

public map<Account,List<contact>> accmap=new map<Account,List<contact>>();

And rest of the code will work fine.

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