Convert a Map to a List of keys
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Map<Id, CustomObject__c> MyMap = new Map<Id, CustomObject__c>(); List<Id> IdList = new List<Id>(); // ... logic to load map ... IdList.addAll(MyMap.keySet()); |
Convert a Map Values to a List of values
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Map<Id, CustomObject__c> MyMap = new Map<Id, CustomObject__c>(); List<CustomObject__c> CustomObjectList = new List<CustomObject__c>(); // ... logic to load map ... CustomObjectList.addAll(MyMap.values()); |
Convert an sObject List to a Map – Example 1 – New map with the List passed into the map’s constructor
Use this method when the map’s key value is the object’s Id. Thanks to this post for explaining the concept: King Koo
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List<CustomObject__c> MyList = new List<CustomObject__c>(); // ... logic to load list ... Map<Id, CustomObject__c> MyMap = new Map<Id, CustomObject__c>(MyList); |
Convert an sObject List to a Map – Example 2 – Loop and Add
Use this method when the map’s key must be a field that is not an object’s id. This is useful when you need to find an object with a name instead of an Id value.
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List<CustomObject__c> MyList = new List<CustomObject__c>(); Map<String, CustomObject__c> MyMap = new Map<String, CustomObject__c>(); // ... logic to load list ... for(CustomObject__c c : MyList) { MyMap.put(c.Name, c); } |