Add new state variable to base contract for upgradeable contracts

[abcoathup]

Hi @ExeciN,

When upgrading we can’t use the initializer modifier, so need to create a custom guard to ensure that the upgrade initialization function is only called once. See the following example:

Error Upgrading smart contracts

Hi @ethicraul, We can’t use the initializer modifier for initializing state in an upgrade, if it was already used for initializing state in the original version. I assume this why the upgrade is reverting. Instead we need to create a custom guard to ensure that any upgrade function is only called once. If you already have a version you could do a check something like the following: function upgradeToV2() public { require(_version < 2, "MyContract: Already upgraded to version 2")…