Openzeppelin-contracts: Unable to import "github/OpenZeppelin/openzeppelin-solidity/contracts/math/SafeMath.sol": File not found

[nsingh3905]

🧐 Motivation
Yes, the problem is related to how the contract interacts with the remix ide

📝 Details

find a way to import the contracts into the chosen smart contract without issues

[abcoathup]

Hi @nsingh3905

You can import OpenZeppelin Contracts with Remix using the prefix https://github.com/OpenZeppelin

Using the example ERC20 contract from the OpenZeppelin documentation you can import OpenZeppelin as follows:

pragma solidity ^0.5.0;

import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v2.3.0/contracts/token/ERC20/ERC20.sol";
import "https://github.com/OpenZeppelin/openzeppelin-contracts/blob/v2.3.0/contracts/token/ERC20/ERC20Detailed.sol";

contract GLDToken is ERC20, ERC20Detailed {
    constructor(uint256 initialSupply) ERC20Detailed("Gold", "GLD", 18) public {
        _mint(msg.sender, initialSupply);
    }
}

Updated to specify version of contracts to import.

For support questions you can ask in the community forum: https://forum.zeppelin.solutions/

[nventuro]

Note that you should only use code published in an official release, but Remix pulls from master directly. You can take a look at our Getting Started guide for information on how to setup a development environment.

[nsingh3905]

Hi I've looked into this method and the transaction on the ethereum ropsten
testnet has failed due to exceeding the gas limit

On Fri, 19 Jul 2019 at 14:32, Nicolás Venturo [e-mail]
wrote:

Note that you should only use code published in an official release, but
Remix pulls from master directly. You can take a look at our Getting
Started https://docs.openzeppelin.org/v2.3.0/get-started guide for
information on how to setup a development environment.

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[abcoathup]

@nsingh3905
I was getting a gas estimation failed error message until I logged into MetaMask.
I updated my sample contract to specify versions of the contract to import. (Thanks @nventuro for the reminder).

For support questions you can ask in the community forum: https://forum.openzeppelin.com/

[Skyge]

@nventuro

Note that you should only use code published in an official release, but Remix pulls from master directly. You can take a look at our Getting Started guide for information on how to setup a development environment.

When I click your recommending Getting Started guide, it shows Page Not Found, so maybe we should correct it to https://docs.openzeppelin.com/contracts/2.x/

[nventuro]

You're correct @Skyge, thanks! I've updated the link in my original comment to https://docs.openzeppelin.com/contracts/2.x/.

I think we can close this now since the original issue has been resolved, and the forum is the preferred medium for support.