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force-app/main/default/classes/OpportunityCloneService.cls

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+/**
+ * @description                     This service exposes methods that contain logic to make cloning an opportunity
+ *                                  much easier and more functional.
+ * @author                          Cloud Performer Inc. <cgary@cloudperformer.com>
+ * @version                         1.0
+ * @group                           Opportunity Cloning
+ * @history                         2021-04-02 - CJG - Created
+ */
+public with sharing class OpportunityCloneService {
+    /**
+     * @description                 exception class that is thrown when something happens in the opportunity
+     *                              clonde process.
+     */
+    public class CloneException extends System.Exception {}
+    public static Map<String,Schema.DescribeSObjectResult> opportunityChildrenMap;
+    static {
+        List<Schema.ChildRelationship> childRelationshipList = 
+            Schema.Opportunity.getSObjectType().getDescribe().getChildRelationships();
+            opportunityChildrenMap = new Map<String, Schema.DescribeSObjectResult>();
+            for(Schema.ChildRelationship childRel:childRelationshipList) {
+                Schema.DescribeSObjectResult childObjRes = childRel.getChildSObject().getDescribe();
+                opportunityChildrenMap.put(childObjRes.getName(),childObjRes);
+            }
+    }
+
+    @AuraEnabled(cacheable=true)
+    public static List<String> ObtainOpporunityChildRelationships(){
+        return new List<String>(opportunityChildrenMap.keySet());
+    }
+
+    public static String ObtainQueryStringForOppAndChildren(Id oppRecordId, List<String> relationships) {
+        String queryString = 'SELECT ';
+        queryString += String.join(ObtainFieldsForObject('Opportunity'),',');
+        List<String> subqueryList = new List<String>();
+        for(String relationship:relationships){
+            Schema.DescribeSObjectResult childObject = opportunityChildrenMap.get(relationship);
+            String childQueryString = '(SELECT ' + String.join(ObtainFieldsForObject(childObject.getName()),',') + ' FROM ';
+            childQueryString += relationship + ')';
+            subqueryList.add(childQueryString);
+        }
+        queryString += ', ' + String.join(subqueryList,',') + 'FROM Opportunity WHERE Id =\'' + oppRecordId + '\'';
+        
+        return queryString;
+    }
+    /**
+     * @description                 this method is responsible for getting the list of fields for a particular object
+     */
+    private static List<String> ObtainFieldsForObject(String objectName) {
+        List<String> fieldNameList;
+        List<String> objectListToDescribe = new List<String>{objectName};
+        List<Schema.DescribeSObjectResult> describeItem = System.Schema.describeSObjects(objectListToDescribe);
+        if(describeItem.isEmpty()) {
+            throw new OpportunityCloneService.CloneException('Could not find info for ' + objectName + '.');
+        }
+        Map<String, Schema.SObjectField> fieldSObjectMapping = describeItem[0].fields.getMap();
+        fieldNameList = new List<String>();
+        for(Schema.SObjectField fieldToken:fieldSObjectMapping.values()) {
+            Schema.DescribeFieldResult fieldTokenDescribe = fieldToken.getDescribe();
+            if(fieldTokenDescribe.isCreateable() && fieldTokenDescribe.isUpdateable()) {
+                fieldNameList.add(fieldTokenDescribe.getName());
+            }
+        }
+        return fieldNameList;
+    }
+}