2

In Truffle's documentation, it says DeployedAddresses.sol is how Truffle identifies and stores the addresses of contracts published to the blockchain via truffle migrate.

How does this file work, and what does it look like? If I publish an Adoption contract, how does Truffle know that the word Adoption in truffle console refers to that contract?

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5

Good qus. As far as I know. Truffle will store your contract address in build/contacts/[CONTRACT.json] file

Truffle will map contract address under network json object with index.

 "networks": {
    "1": {
      "events": {},
      "links": {},
      "address": "0x77685437e762aaa90d4b6924aa9445c1198013f1"
    }
  },
  "schemaVersion": "1.0.1",
  "updatedAt": "2018-02-16T10:49:18.298Z"
}

If you delete json file, It will create new json file with new contract id.

When you run migrate/console, truffle will refer your [CONTRACT.json] file with corresponding network and address.

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2
  • 1
    How is the network number generated? e.g. You've shown "1" above. But on my local machine network number is "1532795656486" - which seems random.
    – Mandar Vaze
    Jul 28 '18 at 17:22
  • The network number is read from the connected rpc client / blockchain. If you look into your ganache UI you see the network number which is set in the JSON in the top bar of the UI.
    – Kie
    Jul 4 at 10:02
1

Truffle requires you to define Migrations by creating a deployer for the Adoptions contract.

For example migrations/2_deploy_contracts.js

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

module.exports = function(deployer) {
  deployer.deploy(Adoption);
};

Building the contract with truffle build also creates an JSON file build/contracts/Adoption.json which contains all required metadata.

DeployedAddresses.sol is created on runtime by truffle when you run tests.

See also: https://github.com/trufflesuite/truffle/issues/471#issuecomment-315166855

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2
  • I knew all this going into asking this question. None of this answered my question unfortunately.
    – AlwaysQuestioning
    Feb 17 '18 at 16:56
  • Maybe you need be more specific. ^^ You may also ask truffle support. E.g via Gitter truffleframework.com/support
    – digitaldonkey
    Feb 20 '18 at 14:50

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