Convert Map to List using SObject field values

Question

I have a Map of Financial__c records, stored like so:

Map<Id, Financial__c> idWithParent = new Map<Id, Financial__c>();

The Id part belongs to a different objects record, like a service or something, pulled from a lookup field on the Financial Record itself. Then we store the entire Financial record the lookup ID was pulled from.

On the individual Financial__c records is a Status field with one of two values: Paid or New.

I can cast the Financial__c records from a map into a list like so:

List<Financial__c> finRecords = idWithParent.values();

My question, is can I cast only specific records from the list using that status field, and ignore the rest?

Something like this:

List<Financial__c> paidOnly = idWithParent.values().onlyPaidStatusRecords.onlyAddPaidItems()?

I dug through the map documentation but am having issues figuring this out. I know I can iterate through the map, but was hoping to eliminate iterating the long way if I can do it quickly doing something like above.

Is this possible? If so, how is it done?

Answer 1

There is no out of the box way to do what you want. You have to iterate. You can write some simple filter mechanisms or use a library like Selector to make your life easier. With that library, you can do things like:

List<Financial__c> paidOnly = Select.Field.isEqual(Financial__c.Status__c, 'Paid')
    .filter(idWithParent.values());

If your just checking simple equality, it's pretty easy to genericize sans library.

public static List<SObject> filterIsEqual
    (SObjectField field, Object value, List<SObject> records)
{
    List<SObject> output = new List<SObject>();
    for (SObject record : records)
        if (record.get(field) == value)
            output.add(record);
    return output;
}