Create a getKitty function that will return all properties of the cat.
1 Like
function getBear(uint256 _tokenId) public view returns(uint256 genes, uint64 birthTime, uint32 mumId, uint32 dadId, uint16 generation) {
return (
bears[_tokenId].genes,
bears[_tokenId].birthTime,
bears[_tokenId].mumId,
bears[_tokenId].dadId,
bears[_tokenId].generation
);
}
1 Like
function getKitty(uint256 tokenId)public view returns(uint256, uint64, uint32, uint32, uint16){
return (kitties[tokenId].genes, kitties[tokenId].birthTime, kitties[tokenId].mumId, kitties[tokenId].dadId, kitties[tokenId].generation);
}
I just watched filips video, i learned like 3 new tricks, with that video *o *, will update my code accordingly.
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Hey guys, there is an error on line 59 that i am not sure how to rectify. Could it be a new syntax that has been implemented by a recent update?
Also my getCat function is on line 65.
2 Likes
Hello @ol_frank. You need a space from cats.push(_cats) -1 the -1 separated.
If you still getting the error, please paste full contract code here, so I can find out what is missing.
1 Like
The space doesn’t resolve the issue unfortunately. @kenn.eth
pragma solidity ^0.8.3;
import "./IERC721.sol";
import "../node_modules/@openzeppelin/contracts/utils/math/SafeMath.sol";
contract Catcontract is IERC721 {
using SafeMath for uint256;
string private constant Name = "Purrfect";
string private constant Symbol = "PURR";
uint16 private constant Creation_Limit_Gen0 = 10;
event Birth(address owner, uint256 catId, uint256 mumId, uint256 dadId, uint256 genes);
modifier onlyOwner{
require(msg.sender == address(this));
_;
}
struct Cat {
uint256 genes;
uint64 birthTime;
uint32 mumId;
uint32 dadId;
uint16 generation;
}
Cat[] cats;
// owner amount
mapping(address => uint256) ownerTokenBalance;
// tokenId owner of cat
mapping(uint256 => address) public catIndexToOwner;
uint256 public gen0Counter;
function createCatGen0(uint256 _genes)public onlyOwner{
require(gen0Counter < Creation_Limit_Gen0);
gen0Counter++;
_createCat(_genes, 0, 0, 0, msg.sender);
}
function _createCat(
uint256 _genes,
uint256 _mumId,
uint256 _dadId,
uint256 _generation,
address _owner
)internal returns(uint256){
Cat memory _cat = Cat({
genes: uint64(_genes),
birthTime: uint64(block.timestamp),
mumId: uint32(_mumId),
dadId: uint32(_dadId),
generation: uint16(_generation)
});
uint256 newCatId = cats.push(_cat) -1;
emit Birth(_owner, newCatId, _mumId, _dadId, _genes);
_transfer(address(0), _owner, newCatId);
return newCatId;
}
function getCat(uint256 _tokenId) public returns(uint256, uint64, uint32, uint32, uint16){
return(cats[_tokenId].genes,
cats[_tokenId].birthTime,
cats[_tokenId].mumId,
cats[_tokenId].dadId,
cats[_tokenId].generation
);
}
function balanceOf(address owner) external override view returns (uint256 balance){
balance = ownerTokenBalance[owner];
return balance;
}
function totalSupply() external override view returns (uint256 total){
total = cats.length;
return total;
}
function ownerOf(uint256 tokenId) external override view returns (address owner){
return catIndexToOwner[tokenId];
}
function transfer(address to, uint256 tokenId) external override{
require(to != address(0), "Cannot Send Tokens To This Address");
require(to != address(this), "Cannot Send Tokens To This Address");
require(owns(msg.sender, tokenId), "You Must Own The Token You Are Sending");
_transfer(msg.sender, to, tokenId);
// ownerTokenBalance[to] = ownerTokenBalance[to].add(1);
// ownerTokenBalance[msg.sender] = ownerTokenBalance[msg.sender].sub(1);
}
function _transfer(address from, address _to, uint256 _tokenId) internal {
ownerTokenBalance[_to]++;
catIndexToOwner[_tokenId] = _to;
//(edge case senario) when we mint new cats we dont want to decrease the token count
if(from != address (0)) {
ownerTokenBalance[from]--;
}
emit Transfer(from, _to, _tokenId);
}
function owns(address claimant, uint256 _tokenId) internal view returns (bool){
return catIndexToOwner[_tokenId] == claimant;
}
}
This looks like is your solidity version. I just make a test of your contract and is sending same error. But when I switch to 0.5 is gone. Always try to use same version like the courses. The rest of the code looks good. Try and let me know
1 Like
Hey @kenn.eth , I tried changing it to the version on the course but it keeps on saying that my compiler version is still 0.8.3 even though i changed it to 0.5.12 in the truffle config.js file. So now my IERC721 and catContract has an error on the version declaration
I used the following:
function getKitty(uint256 _kittyID) public view returns (Kitty memory){
return kitties[_kittyID];
}
1 Like
Oh this message is not an error. This is a message of the compiler of visual code sniped.
You can just ignore it. Change version and run it in Remix.
This is the code from you that I just modify and try it.
pragma solidity ^0.5.3;
contract Catcontract {
string private constant Name = "Purrfect";
string private constant Symbol = "PURR";
uint16 private constant Creation_Limit_Gen0 = 10;
event Birth(address owner, uint256 catId, uint256 mumId, uint256 dadId, uint256 genes);
modifier onlyOwner{
require(msg.sender == address(this));
_;
}
struct Cat {
uint256 genes;
uint64 birthTime;
uint32 mumId;
uint32 dadId;
uint16 generation;
}
Cat[] cats;
// owner amount
mapping(address => uint256) ownerTokenBalance;
// tokenId owner of cat
mapping(uint256 => address) public catIndexToOwner;
uint256 public gen0Counter;
function createCatGen0(uint256 _genes)public onlyOwner{
require(gen0Counter < Creation_Limit_Gen0);
gen0Counter++;
_createCat(_genes, 0, 0, 0, msg.sender);
}
function _createCat(
uint256 _genes,
uint256 _mumId,
uint256 _dadId,
uint256 _generation,
address _owner
)internal returns(uint256){
Cat memory _cat = Cat({
genes: uint64(_genes),
birthTime: uint64(block.timestamp),
mumId: uint32(_mumId),
dadId: uint32(_dadId),
generation: uint16(_generation)
});
uint newCatId = cats.push(_cat) -1;
emit Birth(_owner, newCatId, _mumId, _dadId, _genes);
return newCatId;
}
function getCat(uint256 _tokenId) public returns(uint256, uint64, uint32, uint32, uint16){
return(cats[_tokenId].genes,
cats[_tokenId].birthTime,
cats[_tokenId].mumId,
cats[_tokenId].dadId,
cats[_tokenId].generation
);
}
function balanceOf(address owner) external view returns (uint256 balance){
balance = ownerTokenBalance[owner];
return balance;
}
function totalSupply() external view returns (uint256 total){
total = cats.length;
return total;
}
function ownerOf(uint256 tokenId) external view returns (address owner){
return catIndexToOwner[tokenId];
}
}
1 Like
Nice one! Even though it underlined red its not a serious error? Im guess it won’t effect my Cat dapp further down the line then?
Thanks for your help by the way @kenn.eth appreciate it!
What version of Ownable are you using? The below one comes with error when I tried to inherited to Kittycontract. (Error: Identified not found or not unique)
`Pragma solidity >=0.5.0;
contract Ownable {
address internal owner;
modifier onlyOwner {
require(msg.sender == owner);
_;
}
constructor (){
owner = msg.sender;
}
} `
function getDoraemon(uint256 _tokenId) external view returns(
uint256 genes,
uint64 birthTime,
uint32 mumId,
uint32 dadId,
uint16 generation,
address owner
){
genes = allTokens[_tokenId].genes;
birthTime = allTokens[_tokenId].birthTime;
mumId = allTokens[_tokenId].mumId;
dadId = allTokens[_tokenId].dadId;
generation = allTokens[_tokenId].generation;
owner = tokenToOwner[_tokenId];
}
1 Like
Hey @Haidar_Baqir wellcome! You have to use same version of the other contracs. Post all the code so i can test it in case not work for you.
My code to solve this
function getKitty(uint256 kittyId) public view returns(uint256, uint64, uint32, uint32, uint16){
return (kitties[kittyId].genes, kitties[kittyId].birthTime, kitties[kittyId].mumId,
kitties[kittyId].dadId, kitties[kittyId].generation);
}
test
truffle(develop)> let instance = await KittyContract.deployed()
undefined
truffle(develop)> instance.createKittyGen0(0, {value: '10000', from:accounts[0]})
{
tx: '0xd5585084ba2e898f8035bf9ae6bb41aad95121b2e0648b16e6a713db38ddc1fa',
receipt: {
transactionHash: '0xd5585084ba2e898f8035bf9ae6bb41aad95121b2e0648b16e6a713db38ddc1fa',
transactionIndex: 0,
blockHash: '0x33e5af288409bf56ab07beae96c0fef0e713ab9411561caafccd39c631d264eb',
blockNumber: 7,
from: '0x3dd4fa6633b917895e583608b554a7d7f94ad545',
to: '0x56ab74239f45b65a26ec3a2226ddef195227f53e',
gasUsed: 118419,
cumulativeGasUsed: 118419,
contractAddress: null,
logs: [ [Object], [Object] ],
status: true,
logsBloom: '0x00000000100000000000000000000000000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000008000000000000000000000000000000000000000000000000020000000000000000000800000000000000000000010010000020040000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000002000000000010000000000000000002000000000000000000000020000000040100000000000000000000000000000000000000000000000000000000',
rawLogs: [ [Object], [Object] ]
},
logs: [
{
logIndex: 0,
transactionIndex: 0,
transactionHash: '0xd5585084ba2e898f8035bf9ae6bb41aad95121b2e0648b16e6a713db38ddc1fa',
blockHash: '0x33e5af288409bf56ab07beae96c0fef0e713ab9411561caafccd39c631d264eb',
blockNumber: 7,
address: '0x56aB74239F45B65a26Ec3a2226Ddef195227f53e',
type: 'mined',
id: 'log_2c562b51',
event: 'Birth',
args: [Result]
},
{
logIndex: 1,
transactionIndex: 0,
transactionHash: '0xd5585084ba2e898f8035bf9ae6bb41aad95121b2e0648b16e6a713db38ddc1fa',
blockHash: '0x33e5af288409bf56ab07beae96c0fef0e713ab9411561caafccd39c631d264eb',
blockNumber: 7,
address: '0x56aB74239F45B65a26Ec3a2226Ddef195227f53e',
type: 'mined',
id: 'log_516d2ef4',
event: 'Transfer',
args: [Result]
}
]
}
truffle(develop)> instance.getKitty(0)
Result {
'0': BN {
negative: 0,
words: [ 0, <1 empty item> ],
length: 1,
red: null
},
'1': BN {
negative: 0,
words: [ 11112594, 24, <1 empty item> ],
length: 2,
red: null
},
'2': BN {
negative: 0,
words: [ 0, <1 empty item> ],
length: 1,
red: null
},
'3': BN {
negative: 0,
words: [ 0, <1 empty item> ],
length: 1,
red: null
},
'4': BN {
negative: 0,
words: [ 0, <1 empty item> ],
length: 1,
red: null
}
}
1 Like
Hey man, I had the same error(solidity ^0.8.0) but you can solve it by splitting it into two operations:
Try this if it works for you:
cats.push(_cat);
uint256 newCatId = cats.length - 1;
2 Likes
Assignment here:
event Breed(address owner, uint256 kittenId, uint256 mumId, uint256 dadId, uint256 genes, uint256 generation);
function getKitty(uint256 _tokenId) external view returns(uint256, uint64, uint32, uint32, uint16) {
return (
kitties[_tokenId].genes,
kitties[_tokenId].birthTime,
kitties[_tokenId].mumId,
kitties[_tokenId].dadId,
kitties[_tokenId].generation
);
}
Questions: Where should I put the emit Breed (event)? Should I call _createKitty in this function as well? OR This is not yet the breeding part?
function getOrder(uint256 _id) external view returns(
uint256 id,
uint256 cost,
string memory productName,
string memory description,
uint256 leadTime_in_days
) {
return (
orderVolume[_id].id,
orderVolume[_id].cost,
orderVolume[_id].productName,
orderVolume[_id].description,
orderVolume[_id].leadTime_in_days
);
}
1 Like