Could not find zos-lib/contracts/migrations/Migratable.sol from any sources when following tutorial

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1

Hi. I am going to the official Tutorial for upgradable SmartContracts using OpenZellin-OS and got in stuck very fast:

The base contract is importing zos-lib/contracts/migrations/Migratable.sol. But there is none in zos-lib.

pragma solidity ^0.4.21;
import "zos-lib/contracts/migrations/Migratable.sol";

contract MyContract is Migratable {
  uint256 public x;

  function initialize(uint256 _x) isInitializer("MyContract", "0") public {
    x = _x;
  }
}

The command zos add MyContract gives the following error:

Could not find zos-lib/contracts/migrations/Migratable.sol from any sources

Looking into the sos-lib package, there is no migration-folder.

$ ls -l node_modules/zos-lib/contracts/

lists only those:

Initializable.sol 
application       
cryptography      
ownership         
upgradeability    
util

Do I have to add more packages in order to make it work?

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2

Hi @oxuw4 I get the same error, using the following versions:

zos --version 2.3.0
truffle version Truffle v5.0.2 (core: 5.0.2)

3

Just some housekeeping, I have moved the topic to the #support:zeppelinos category so we can track it until we have an answer and renamed the topic slightly to be clear that this is an issue when following the tutorial.

4

It seems that things have changed significantly here. Referring to this tutorial, which seems to be more up to date, the initializing-process goes as follows:

pragma solidity ^0.5.0;

import "zos-lib/contracts/Initializable.sol";

contract MyContract is Initializable {

  uint256 public x;
  string public s;

  function initialize(uint256 _x, string memory _s) initializer public {
    x = _x;
    s = _s;
  }
}

Please consider the import of initializable.sol instead migratable.sol

Hope this helps.

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5

Hey @itinance. Thanks for your contribution!

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6

The current tutorial for ZeppelinOS:

The current tutorial for using ZepKit:
https://zepkit.zeppelinos.org/

The tutorial is for ZeppelinOS 1.x
Migratable has been deprecated.

https://docs.zeppelinos.org/docs/new_2.html
On 2.x, the Migratable contract has been deprecated, and we are shifting to a much simpler flavour of Initializable .

Apologies for the confusion. I have logged as an issue to improve the documentation: https://github.com/zeppelinos/zos/issues/923

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