Problem with retrieve function or related variables. I copied everything exactly, just change variable names.

[0xFLT]

I am on lesson 3, making the StorageFactory. Instead of names and fav numbers, I am doing Token Tickers and prices. I tried resolving this in multiple ways, and ended up copying the whole contract exactly as it is posted, then I went back and changed the variable names to match my scheme and TokenEntry.sol contract from lesson 2.

Can you help me figure out why the retrieve term on the last line will not compile? After you find the solution, please explain how I can find solutions like this in the future.
Thank you. 🙏

pragma solidity ^0.8.0;

import "./TokenEntry.sol";

contract TokenGenerator {
    TokenEntry[] public TokenEntryArray;

    function createTokenGenerator() public {
        TokenEntry TokenEntryCopy = new TokenEntry();
        TokenEntryArray.push(TokenEntryCopy);
    }

    function TokenGenIndex(uint256 _TokenEntryIndex, uint256 _TokenEntryNumber) public {
        TokenEntryArray[_TokenEntryIndex].store(_TokenEntryNumber);
    }

    function TokenGenReader(uint256 _TokenEntryIndex) public view returns(uint256){
        return TokenEntryArray[_TokenEntryIndex].retrieve();
    }
}

[Nlferu]

Hello @0xFLT

Here is your fixed code:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0;

import "./TokenEntry.sol";

contract TokenGenerator is TokenEntry {
    TokenEntry[] public TokenEntryArray;

    function createTokenGenerator() public {
        TokenEntry TokenEntryCopy = new TokenEntry();
        TokenEntryArray.push(TokenEntryCopy);
    }

    function TokenGenIndex(uint256 _TokenEntryIndex, uint256 _TokenEntryNumber) public {
        TokenEntry TokenEntryCopy = TokenEntry(address(TokenEntryArray[_TokenEntryIndex]));
        TokenEntryCopy.store(_TokenEntryNumber);
    }

    function TokenGenReader(uint256 _TokenEntryIndex) public view returns (uint256) {
        return TokenEntry(address(TokenEntryArray[_TokenEntryIndex])).retrieve();
    }
}

Please let me know if it works now. To find errors like this I prefer to code it straight in Remix so I can fix all bugs much easier as Remix points you in which exact line there is error straight.

[0xFLT]

sorry I am getting the same error in Remix. That makes more sense to me tho.

But that opens another question of how this code in the video is working.
Thank you for your time.

[Nlferu]

Hi @0xFLT

Show me your TokenEntry.sol as there lies your error. Mine is as below:

// SPDX-License-Identifier: MIT
pragma solidity ^0.8.0; // it means that only this version and above are ok

contract TokenEntry {

    uint256 favoriteNumber; 
    bool favBool;

    struct People
    {
        uint256 favoriteNumber;
        string name;
    }

    People[] public people;
    
    // It will map user name to his number -> we search for name we get number
    mapping(string => uint256) public nameToFavoriteNumber;

    function store(uint256 favNumber) public
    {
        favoriteNumber = favNumber;
    }

    function retrieve() public view returns(uint256)
    {
        return favoriteNumber;
    }

    function addPerson(string memory _name, uint256 favNumber) public
    {
        // people.push(People({favoriteNumber: favNumber, name: _name})); -> other way of passing arguments to function
        people.push(People(favNumber, _name));  // adding new values to the array
        nameToFavoriteNumber[_name] = favNumber;  // mapping name with favorite number
    }
}

[0xFLT]

ah I will check. Here is my version.

pragma solidity 0.8.7; //^0.8.7

contract TokenEntry {

uint256 BuyPrice; // Initialized to 0

struct Token {
    uint256 BuyPrice;
    string TokenTicker;
}

Token[] public tokenticker;

mapping(string => uint256) public TokenTickerToBuyPrice;

function store(uint256 _BuyPrice) public {
    BuyPrice = _BuyPrice;
}

function EntryPrice() public view returns (uint256){
    return BuyPrice;
}

function addToken(string memory _tokenticker, uint256 _BuyPrice) public {
    tokenticker.push(Token(_BuyPrice, _tokenticker));
    TokenTickerToBuyPrice[_tokenticker] = _BuyPrice;
}

}

[Nlferu]

@0xFLT

Just rename your EntryPrice() function to retrieve(). This will fix your problem

[0xFLT]

ah I feel like a fool. thank you sir