PSP1155 Metadata

This example shows how you can reuse the implementation of PSP1155 token with PSP1155Metadata extension.

Step 1: Add imports and enable unstable feature

Import everything from brush::contracts::psp1155::extensions::metadata.

#![cfg_attr(not(feature = "std"), no_std)]#![feature(min_specialization)]
#[brush::contract]pub mod my_psp1155 {    use brush::contracts::psp1155::extensions::metadata::*;    use ink_prelude::string::String;    use ink_storage::traits::SpreadAllocate;...

Step 2: Define storage

Declare storage struct and declare the field related to the PSP1155MetadataStorage trait in addition to your PSP1155Storage field. Then you need to derive the PSP1155MetadataStorage trait and mark the corresponding field with the #[PSP1155MetadataStorageField] attribute. Deriving this trait allows you to reuse the PSP1155Metadata extension in your PSP1155 implementation.

#[derive(Default, SpreadAllocate, PSP1155Storage, PSP1155MetadataStorage)]#[ink(storage)]pub struct MyPSP1155 {    #[PSP1155StorageField]    psp1155: PSP1155Data,    #[PSP1155MetadataStorageField]    metadata: PSP1155MetadataData,}

Step 3: Inherit logic

Inherit implementation of the PSP1155Metadata trait. You can customize (override) methods in this impl block.

impl PSP1155 for MyPSP1155 {}
impl PSP1155Metadata for MyPSP1155 {}

Step 4: Define constructor

Define constructor. Your PSP1155Metadata contract is ready!

impl MyPSP1155 {    #[ink(constructor)]    pub fn new(uri: Option<String>) -> Self {        ink_lang::codegen::initialize_contract(|instance: &mut Self| {            instance.metadata.uri = uri;        })    }}

You can check an example of the usage of PSP1155 Metadata.

You can also check the documentation for the basic implementation of PSP1155.