Can't get value from deployed contract

• I’ve asked for help in the Truffle Gitter before filing this issue.

---

Issue

I’m trying to use truffle on Quorum, so I followed tutorial - Building dapps for Quorum: Private Enterprise Blockchains

Steps to Reproduce

1. unlike tutorial using vagrant, I use docker to build 4 nodes, but I also port forward them to 22000~22003
2. truffle init
3. edit truffle-config.js

networks: {
     development: {
      host: "127.0.0.1",     // Localhost (default: none)
      port: 22000,
      network_id: "*",       // Any network (default: none)
      gasPrice: 0,
      gas: 4500000,
      type: "quorum"
     },
}

1. create contract/SimpleStorage.sol and change required solc to ^0.5.16, then command truffle compile
2. create migrations/2_deploye_simplestorage.js and modify privateFor parameter

var SimpleStorage = artifacts.require("SimpleStorage");

module.exports = function(deployer) {
  // Pass 42 to the contract as the first constructor parameter
  deployer.deploy(SimpleStorage, 42, {privateFor: ["QE/RfPZh4yom6qPZOk8gfFLMeePGE+F+uG4532VinUs="]})
};

1. unlock account: geth attach --exec "personal.unlockAccount(eth.accounts[0], '', 60)" http://127.0.0.1:22000
2. deploy contract: truffle migrate

Expected Behavior

According to tutorial, I should be able to get value from contract once my truffle migrate done

truffle console
truffle(development)> SimpleStorage.deployed().then(function(instance) { return instance.get(); })
{ [String: '42'] s: 1, e: 1, c: [ 42 ] }

Actual Results

truffle console
truffle(development)> SimpleStorage.deployed().then(function(instance) { return instance.get(); })
BN { negative: 0, words: [ 0, <1 empty item> ], length: 1, red: null }

Environment

• Operating System: Ubuntu 16.04.6 LTS
• Ethereum client: 1.8.27-stable ( host ) / 1.8.18-stable + Quorum 2.4.0 ( container )
• Truffle version (truffle version): v5.1.9
• node version (node --version): v13.6.0
• npm version (npm --version): 6.13.4

[gnidan]

Hey @yxguo2536, could you throw an extra .then onto the end to convert to string?

truffle(development)> SimpleStorage.deployed().then(function(instance) { return instance.get(); }).then(function(bn) { return bn.toString() });

The first thing to notice is that the tutorial is probably out of date. Your expected result is a BigNumber, but Truffle now uses the BN library instead. If you convert to a string, you’ll see if you get "42" or not.

Let us know! Thanks!

[eggplantzzz]

Sorry about that @yxguo2536. We’ll close this for issue maintenance for now, if you re-encounter this and can re-report it we would appreciate it!