fls

//Usage
...stuff
allChildren = trController.stripFLSFields('update', allChildren);
update allChildren;
..morestuff

//Method
public static List<sObject> stripFLSFields(String operation, List<sObject> newRecords){
		List<sObject> returnList = new List<sObject>();
		if(newRecords.size()>0){
			Schema.sObjectType objectType = newRecords[0].getSObjectType();
			Map<String,Schema.SObjectField> objectFields = objectType.getDescribe().fields.getMap();
			List<Schema.describeFieldResult> flsValidFields = new List<Schema.describeFieldResult>();
			for(String fieldKey : objectFields.keySet()){
				Schema.SObjectField field = objectFields.get(fieldKey);
				Schema.describeFieldResult fieldDescribe = field.getDescribe();
				
				if(operation == 'insert'){
					if(fieldDescribe.isCreateable() || fieldDescribe.getName() == 'Id'){
						flsValidFields.add(fieldDescribe);
					}
				} else if(operation == 'update' || operation =='delete'){
					if(fieldDescribe.isUpdateable() || fieldDescribe.getName() == 'Id'){
						flsValidFields.add(fieldDescribe);
					}
				} else if(operation == 'upsert'){
					if( ( fieldDescribe.isUpdateable() && fieldDescribe.isCreateable() ) || fieldDescribe.getName() == 'Id'){
						flsValidFields.add(fieldDescribe);
					}
				}
			}
			
			for(sObject newRecord : newRecords){
				sObject objectTemplate = objectType.newSObject();
				for(Schema.describeFieldResult field : flsValidFields){
					String fieldName = field.getName();
					try{
						if(newRecord.get(fieldName)!=null){
							objectTemplate.put(fieldName,newRecord.get(fieldName));
						}
					} catch(Exception e){

					}
				}
				returnList.add(objectTemplate);
			}
		}
		return returnList;
	}