Mass Entity Template creation issue

Development Programming & Scripting
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1

To start off i have an actor with a mass agent component on it, and in that component i have an entity config which has a basic inventory trait that has exposed variables MaxWeight and MaxSlots. Here is my BuildTemplate override for the inventory trait:

UE_LOG(LogEntity, Log, TEXT("*** Building inventory template"));
FFPInventoryContainerFragment& container = BuildContext.AddFragment_GetRef<FFPInventoryContainerFragment>();

// Name is set in initializer
container.InventoryID = FGuid::NewGuid();
container.CurrentWeight = 0.0f;
container.MaxWeight = MaxWeight;
container.MaxSlots = MaxSlots;
container.InventoryItems.Reserve(MaxSlots);
BuildContext.AddFragment<FFPInventoryCommandQueueFragment>();
BuildContext.AddTag<FFPInventoryNeedsInitTag>();
UE_LOG(LogFringeEntity, Log, TEXT("\t>Inventory template built [%s[%s]] -- Max Weight: %f -- Max Slots: %d"), *container.InventoryName.ToString(), *container.InventoryID.ToString(), container.MaxWeight, container.MaxSlots);

This should set the maxweight and maxslots variables in my inventory container, which it does. Now, i have a player inventory and a small chest inventory both are built according to my console log:

Log LogEntity *** Building inventory template
Log LogEntity >Inventory template built [[8FC379DF4268AE6A6AF03D93D772F0B4]] -- Max Weight: 250.000000 -- Max Slots: 15
Log LogEntity >Adding Player Inventory Specific Fragments/Tags
Log LogEntity >Player Inventory Specific Fragments/Tags Added
Log LogEntity *** Building inventory template
Log LogEntity >Inventory template built [[5A5C416A4F7C7011EFA2B992701B967B]] -- Max Weight: 2000.000000 -- Max Slots: 35

but my initializer processor:

EntityQuery.ForEachEntityChunk(Context, [this](FMassExecutionContext& Context)
{
int32 numberOfEntities = Context.GetNumEntities();

	UE_LOG(LogEntity, Log, TEXT("*** Inventory initializer observer executing, %d entities to process"), numberOfEntities);

	TConstArrayView<FFPEntityInfoFragment> entityInfos = Context.GetFragmentView<FFPEntityInfoFragment>();
	TArrayView<FFPInventoryContainerFragment> containers = Context.GetMutableFragmentView<FFPInventoryContainerFragment>();
	TArrayView<FFPInventoryCommandQueueFragment> commandQueues = Context.GetMutableFragmentView<FFPInventoryCommandQueueFragment>();
	
	for (int32 entityIndex = 0; entityIndex < numberOfEntities; ++entityIndex)
	{
		FFPInventoryContainerFragment& container = containers[entityIndex];
		FFPInventoryCommandQueueFragment& commandQueue = commandQueues[entityIndex];
		FMassEntityHandle entity = Context.GetEntity(entityIndex);

		if (Context.DoesArchetypeHaveTag(*FFPPlayerInventoryTag::StaticStruct()))
		{
			container.InventoryName = FText::FromString(TEXT("My Inventory"));
			Context.Defer().AddTag<FFPRequestSyncEntityToUITag>(entity); // For initial sync to ui
		}

		else
		{
			const FFPEntityInfoFragment& info = entityInfos[entityIndex];
			
			if (!info.EntityData)
			{
				UE_LOG(LogEntity, Error, TEXT("\t>Tried to initialize inventory but the object data was null"));
				continue;
			}
		
			container.InventoryName = info.EntityData->BasicData.Name;
		}
		
		// Make sure the queue is clear
		commandQueue.PendingOperations.Empty();

		Context.Defer().RemoveTag<FFPInventoryNeedsInitTag>(entity);

		UE_LOG(LogEntity, Log, TEXT("\t>Initialized inventory [%s[%s]] -- Max Weight: %f -- Max Slots: %d"), *container.InventoryName.ToString(), *container.InventoryID.ToString(), container.MaxWeight, container.MaxSlots);
	}
});`

Outputs:
Log LogEntity *** Inventory initializer observer executing, 1 entities to process
Log LogEntity >Initialized inventory [My Inventory[5A5C416A4F7C7011EFA2B992701B967B]] -- Max Weight: 2000.000000 -- Max Slots: 35

It seems that my processor is just using the data from the last template built?

2

For people in the future i solved this by making a new fragment to save the data in for all entities using a certain entityConfig and making it a SHARED fragment which apparently lets me set the data in it to be reused on all entities of a certain archetype:

UE_LOG(LogEntity, Log, TEXT("*** Building inventory template"));

FFPInventoryContainerConfigFragment config;
config.MaxWeight = MaxWeight;
config.MaxSlots = MaxSlots;
BuildContext.AddSharedFragment(FSharedStruct::Make(config));

BuildContext.AddFragment<FFPInventoryContainerFragment>();

BuildContext.AddFragment<FFPInventoryCommandQueueFragment>();
BuildContext.AddTag<FFPInventoryNeedsInitTag>();
UE_LOG(LogEntity, Log, TEXT("\t>Inventory template built [Config Fragment] -- Max Weight: %f -- Max Slots: %d"), config.MaxWeight, config.MaxSlots);