ERC-721 Metadata

Extension of ERC-721 that adds the optional metadata functions from the ERC721 standard.

Usage

In order to make ERC-721 Metadata methods “external” so that other contracts can call them, you need to add the following code to your contract:

use openzeppelin_stylus::token::erc721::{
    self, extensions::Erc721Metadata, Erc721,
};

#[entrypoint]
#[storage]
struct Erc721Example {
    #[borrow]
    erc721: Erc721,
    #[borrow]
    metadata: Erc721Metadata,
}

#[public]
#[inherit(Erc721, Erc721Metadata)]
impl Erc721Example {
    // ...

    #[selector(name = "tokenURI")]
    fn token_uri(&self, token_id: U256) -> Result<String, erc721::Error> {
        self.metadata.token_uri(token_id, &self.erc721)
    }
}

Additionally, you need to ensure proper initialization during contract deployment. Make sure to include the following code in your Solidity Constructor:

contract Erc721Example {
    // ...

    string private _name;
    string private _symbol;
    string private _baseUri;

    constructor(string memory name_, string memory symbol_, string memory baseUri_) {
        // ...
        _name = name_;
        _symbol = symbol_;
        _baseUri = baseUri_;
        // ...
    }
}