/**
* This is taken from https://gist.github.com/afawcett/8dbfc0e1d8c43c982881.
*
* This method works on the principle that serializing and deserialising child records is supported
*
* System.assertEquals(1, ((List<Master__c>)
* JSON.deserialize(
* JSON.serialize(
* [select Id, Name,
* (select Id, Name from Children__r) from Master__c]), List<Master__c>.class))
* [0].Children__r.size());
*
* This method results internally in constructing this JSON, before deserialising it back into SObject's
*
* [
* {
* "attributes": {
* "type": "Master__c",
* "url": "/services/data/v32.0/sobjects/Master__c/a0YG0000005Jn5uMAC"
* },
* "Name": "Fred",
* "Id": "a0YG0000005Jn5uMAC",
* "Children__r": {
* "totalSize": 1,
* "done": true,
* "records": [
* {
* "attributes": {
* "type": "Child__c",
* "url": "/services/data/v32.0/sobjects/Child__c/a0ZG0000006JGPAMA4"
* },
* "Name": "Bob",
* "Id": "a0ZG0000006JGPAMA4",
* "Master__c": "a0YG0000005Jn5uMAC"
* }
* ]
* }
* ]
*/
public static object makeRelationship(Type parentsType, List <SObject> parents, SObjectField relationshipField, List <List <SObject> > children)
{
// Find out more about this relationship...
string relationshipFieldName = relationshipField.getDescribe().getName();
DescribeSObjectResult parentDescribe = parents.getSObjectType().getDescribe();
List <Schema.ChildRelationship> childRelationships = parentDescribe.getChildRelationships();
string relationshipName = null;
foreach (Schema.ChildRelationship childRelationship in childRelationships)
{
if (childRelationship.getField() == relationshipField)
{
relationshipName = childRelationship.getRelationshipName();
break;
}
}
// Stream the parsed JSON representation of the parent objects back out, injecting children as it goes
JSONParser parentsParser = JSON.createParser(JSON.serialize(parents));
JSONParser childrenParser = JSON.createParser(JSON.serialize(children));
JSONGenerator combinedOutput = JSON.createGenerator(false);
streamTokens(parentsParser, combinedOutput, new InjectChildrenEventHandler(childrenParser, relationshipName, children));
// Derserialise back into SObject list complete with children
return(JSON.deserialize(combinedOutput.getAsString(), parentsType));
}
