[Resolved] Table Question

[TheSAguy]

Okay, I can't get this figured out.
I am creating some hidden entities that I need to delete once I mine the main one, but also need to store all the entities in a table, since I need to check the inventory levels.

Here is my code for creating and storing the entities in the table:

On Build

Code: Select all

	if entity.valid and entity.name == "TerraformingStation" then
	  
		T_Station_Inv = surface.create_entity({name = "TerraformingStation_i", position = position, direction = event.created_entity.direction, force = force})
		T_Station_Container = surface.create_entity({name = "TerraformingStation_c", position = position, direction = event.created_entity.direction, force = force})
		T_Station_Radar = surface.create_entity({name = "TerraformingStation_r", position = position, direction = event.created_entity.direction, force = force})
		
		T_Station_Inv.health = event.created_entity.health
		event.created_entity.destroy()
		
		T_Station_Inv.operable = true
		T_Station_Inv.minable = true
		
		T_Station_Container.destructible = false
		T_Station_Container.operable = false
		T_Station_Container.minable = false
		
		T_Station_Radar.operable = false
		T_Station_Radar.destructible = false
		T_Station_Radar.minable = false
				
		table.insert(global.Terraforming_Station_Table, {T_Station_Inv,T_Station_Container,T_Station_Radar})

	  
	end   

Now when I mine the Station, I'm deleting all stations that exist....

On Remove

Code: Select all

		
	--- Terraforming Station has been removed
	if entity.valid and entity.name == "TerraformingStation_i" then
      
		if global.Terraforming_Station_Table ~= nil then
	

			for ix, vx in ipairs(global.Terraforming_Station_Table) do

					if vx[1].valid then
						vx[1].destroy()
					end
					if vx[2].valid then
						vx[2].destroy()
						T_Count()
					end	
					if vx[3].valid then
						vx[3].destroy()
					end	

			
			
			end
		
		
		end

	end

So "TerraformingStation_i" is the Main Entity. When it gets removed, I need to destroy the corresponding "TerraformingStation_c" and "TerraformingStation_r" entities.

I was thinking of checking the positions of each. If they match delete them, but try as I may, or I delete ALL "TerraformingStation_i" entities are removed, or I'm not deleting the other "c" and "r" entities...

Thanks for any help.

[Optera]

For me best practice is to store the main entity with its sub entities in one global list indexed by entity.unit_number and set script generated sub entities minable = false and destructible = false.

Code: Select all

local entity = event.created_entity
if entity.valid and entity.name == "TerraformingStation" then
  local T_Station_Inv = surface.create_entity({name = "TerraformingStation_i", position = position, direction = event.created_entity.direction, force = force})
  local T_Station_Container = surface.create_entity({name = "TerraformingStation_c", position = position, direction = event.created_entity.direction, force = force})
  local T_Station_Radar = surface.create_entity({name = "TerraformingStation_r", position = position, direction = event.created_entity.direction, force = force})
 
  global.T_Stations[entity.unit_number] = {entity=entity, inventory=T_Station_Inv, container=T_Station_Container, radar=T_Station_Radar}
end

Now if the main entity is destroyed or removed you can directly destroy the sub entities from the stored global entity list.

Code: Select all

local entity = event.entity
if entity.valid and entity.name == "TerraformingStation" then
  global.T_Stations[entity.unit_number].radar.destroy()
  global.T_Stations[entity.unit_number].container.destroy()
  global.T_Stations[entity.unit_number].inventory.destroy()
  global.T_Stations[entity.unit_number] = nil
end

Storing all entities belonging to one object makes accessing them very easy for other updates as well.

[TheSAguy]

Thanks Optera, worked like a charm!