Function Errors

Moralis General
#1

I appreciate the help so far, I am finally able to access my site locally! When I run the site with the console I get the following errors:

image
image444Ɨ672 21.2 KB

Further, when I try to mint using ā€œCreateā€ button I get this error
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image450Ɨ540 21.4 KB

This is line 203-212

loadItems = async () => {
    const items = await Moralis.Cloud.run("getItems");
    user = await Moralis.User.current();
    items.forEach(item => {
        if (user){
            if (user.attributes.accounts.includes(item.ownerOf)){
                const userItemListing = document.getElementById(`user-item-${item.tokenObjectId}`);
                if (userItemListing) userItemListing.parentNode.removeChild(userItemListing);
                getAndRenderItemData(item, renderUserItem);
                return;

lines 194-199:

loadUserItems = async () => {

    const ownedItems = await Moralis.Cloud.run("getUserItems");

    ownedItems.forEach(item => {

        const userItemListing = document.getElementById(`user-item-${item.tokenObjectId}`);

        if (userItemListing) return;

        getAndRenderItemData(item, renderUserItem);

line 161:
const nftId = await mintNft(nftFileMetadataFilePath);
and lines 179-182:

mintNft = async (metadataUrl) => {

    const receipt = await tokenContract.methods.createItem(metadataUrl).send({from: ethereum.selectedAddress});

    console.log(receipt);

    return receipt.events.Transfer.returnValues.tokenId;

The line that gives an error when the page first runs is line 204:
const items = await Moralis.Cloud.run("getItems"); I included the whole function that includes this line for context above.
I am trying to follow along with the tutorial, and it is an advantage to have the code written on Github already. I just need help tweaking it so it functions properly. Thank you

#2

for this error youā€™ll have to look on what you added as cloud code on your Moralis Server.
this line calls a cloud function named getItems that you have to add it in your cloud code.

for the second error: return receipt.events.Transfer.returnValues.tokenId;
it looks like this receipt doesnā€™t have that Transfer event, you can look on what you have in that receipt (you already have console.log(receipt);)

#3

In the cloud.js file, it looks like that function for getItems is defined here:

Moralis.Cloud.define("getItems", async (request) => {

     

    const query = new Moralis.Query("ItemsForSale");

    query.notEqualTo("isSold", true);

    query.select("uid","askingPrice","tokenAddress","tokenId", "token.token_uri", "token.symbol","token.owner_of","token.id", "user.avatar","user.username");

 

    const queryResults = await query.find({useMasterKey:true});

    const results = [];

 

    for (let i = 0; i < queryResults.length; ++i) {

 

      if (!queryResults[i].attributes.token || !queryResults[i].attributes.user) continue;

 

      results.push({

        "uid": queryResults[i].attributes.uid,

        "tokenId": queryResults[i].attributes.tokenId,

        "tokenAddress": queryResults[i].attributes.tokenAddress,

        "askingPrice": queryResults[i].attributes.askingPrice,

 

        "symbol": queryResults[i].attributes.token.attributes.symbol,

        "tokenUri": queryResults[i].attributes.token.attributes.token_uri,

        "ownerOf": queryResults[i].attributes.token.attributes.owner_of,

        "tokenObjectId": queryResults[i].attributes.token.id,

       

        "sellerUsername": queryResults[i].attributes.user.attributes.username,

        "sellerAvatar": queryResults[i].attributes.user.attributes.avatar,

      });

    }

It looks like thereā€™s a for loop that checks for unsold items, makes sure the results are not 0, and returns the results. I donā€™t see a problem with this partā€¦

On the part with the function mintNFT, Niclas writes this function at 4:45 of the Part 7 video, I might have lost track but I canā€™t seem to find the part where metadataUrl gets initialized or defined. Unless its not a variable here. Again I am still new to the java commands. What is metadataUrl referencing here?

#4

Metadata url usually is the url that points to additional information about a specific token that is in json format, like a name, an image url, a description.

#5

Ok so in the video, he goes on to explain that the transfer event references the _safeMint function in the MorarableToken.sol, which references this function in the ERC721.sol file:

function _mint(address to, uint256 tokenId) internal virtual {

        require(to != address(0), "ERC721: mint to the zero address");

        require(!_exists(tokenId), "ERC721: token already minted");

        _beforeTokenTransfer(address(0), to, tokenId);

        _balances[to] += 1;

        _owners[tokenId] = to;

        emit Transfer(address(0), to, tokenId);

    }
#6

This is the transfer event

#7

Ok, what do I have to change to fix this?

#8

I donā€™t know what you want to fix.

#9

This function still causes errors when I access the page from Chrome. All the pieces are there but for some reason Chrome cannot read it.
Also, later in the video Niclas adds to this block of code:
image
Which does not appear in the version of main.js that I got from Github. Do I need to add this or was it removed in later revisions?

#10

For me it looks like this code adds info to the database in item table. I donā€™t know exactly what happens in that tutorial to answer you exactly if you need or not this code. Maybe it helps to populate the database with some info.

#11

You may be also able to find help in other forum posts, for example maybe here: Solving common problems [Rarible Clone]