Worldmigrators, shard linking, in Don't Starve Together

migrators.lua

# Here you'll find various code snippets for dealing with world migrators.
# Original source, and more info: https://forums.kleientertainment.com/forums/topic/59174-understanding-shards-and-migration-portals/

1) Join a server
(We are in master now, shard_id is 1)
2) c_spawn("cave_entrance")
(Cave entrance will be id 11, automatically, since there were 10 cave entrances by default on generation)
3) Stand near the entrance, as c_find picks the closest thing
4) c_find("cave_entrance_open").components.worldmigrator:SetDestinationWorld(shard_id,true)
(This shard id will be the second slave)
5) Use the entrance
6) You will migrate to slave 2, from portal 11 from master
7) Since only 10 cave exits are here, you will go somewhere else, find a place to make a new exit
8) c_spawn("cave_exit")
(This cave exit will be id 11, automatically, since there were 10 cave exits by default on generation)
9) c_find("cave_exit").components.worldmigrator:SetReceivedPortal(shard_id, 11)
Caves: 2
Third: 3
Travelling:
c_gonext("cave_entrance")
c_gonext("cave_entrance_open")
c_gonext("cave_exit")
c_gonext("migration_portal")

Modification:
mig=c_find("cave_entrance_open").components.worldmigrator
mig=c_find("cave_exit").components.worldmigrator
mig=c_find("migration_portal").components.worldmigrator

mig:SetDestinationWorld(shard_id,true)
mig:SetDestinationWorld("1",true)
mig:SetReceivedPortal(shard_id,migrator_id)

Debugging:
print(mig:GetDebugString())
print(c_find("cave_entrance_open").components.worldmigrator:GetDebugString())
print(c_find("cave_exit").components.worldmigrator:GetDebugString())
print(c_find("migration_portal").components.worldmigrator:GetDebugString())

for k, v in pairs(Ents) do if v.prefab == "cave_exit" then v.components.worldmigrator:SetDestinationWorld("1",true) end end

for k, v in pairs(Ents) do if v.components.worldmigrator ~=nil  then print(v.components.worldmigrator:GetDebugString()) end end