Create Extension Tables

Primodium Tables store data in on-chain tables (opens in a new tab) as defined in the open MUD standard.

Primodium Tables exist both in the core Primodium contracts and in world extensions. When defining a new table, you must first declare it in the mud.config.ts file. This file is used to generate the Solidity contracts that handle setters, getters, and the decoding of each table.

In the ReadDemo, this code can be found in packages/contracts/mud.config.ts. Every plugin will need a defineWorld, which is stored in mud.config.ts. Plugins must exist in a Namespace. Multiple Systems and Tables can exist in a namespace.

Since this demo only deploys a system for reading data, we will not need any new Tables, but we will need to declare a Namespace and System.

import { defineWorld } from "@latticexyz/world";
 
export default defineWorld({
  namespace: "PluginExamples",
  systems: {
    ReadDemoSystem: {
      name: "ReadDemoSystem",
      openAccess: true,
    },
  },
  tables: {},
});

The Namespace is where the System will live. They can be up to 16 characters long, and every namespace must be unique. If you run into a collision, choose a different name. The collision revert will say World_ResourceAlreadyExists(), indicating the namespace already exists and you are not the owner.

More details on MUD Config can be found here (opens in a new tab).