Here is the article:
Updating smart contracts with new fields: how to safely modify storage layout
As a developer who works in Ethereum -based intelligent contracts, you are probably familiar with the concept of updating your code base to incorporate new features. In this article, we will exploit how safely update your existing intelligent contract using up -to -date smart contract patterns and introduce a new structure called GovernorTingSimplesporage.
Bottom
In recent times, developers have experienced intelligent update contracts, which use special properties such as update () and Removable () to allow more flexibility in the code. These updates can improve the scalability, performance and safety of your contract. A common approach is to create new structures that modify the existing storage layout.
GovernmentSimpleslestage Upgrade
Let’s assume that you have a structure called GovernmentRCountingSimplestoage with existing fields:
`Solidity
// governmentrcountingsimplestore.sol
STRUCT GOVERNORTINGSIMPLESLETORAGE {
Uint256 _Governors: Uint256;
}
`
To update this contract, we need to create a new structure that modifies the storage layout. We can achieve this by adding new fields that are not yet defined in the original structure.
`Solidity
// GovernorTingSimplesorGepgrade.Sol
Pragma solidity ^0.8,0;
STRUCT GOVERNORTINGSIMPLESLETORAGE {
UINT256 _GOVERNORES;
Uint256 [] Governors; // new field: governmentrcountingsimpleslestoring
}
Builder () Audience {
_Governors = 10; // Initial value for the governmentrcountingSimplestoage Array
}
`
In this updated version, we have added a new GovernmentSimpleslestage field, which stores a matrix of values Uint256. This new field is not part of the original structure and has a different name.
safely modifying the storage layout
To safely modify the storage layout, you must always follow these guidelines:
- Avoid changing the fields of the structure directly : Instead, use the new structure to create a temporary matrix and update it.
- Use the update ()Function : To make your update work work, you need to call
update ()in the original structure before modifying your fields.
Let’s demonstrate this with an example:
`Solidity
// GovernorTingSimplesorGepgrade.Sol
Pragma solidity ^0.8,0;
STRUCT GOVERNORTINGSIMPLESLETORAGE {
UINT256 _GOVERNORES;
}
GovernorTingSimplestoretrageutoPGrade contract is update of the contract {
GetGovernor () Public View Returns Function (Uint256) {
Return _Governors;
}
}
Update Function () Pure Virtual Internal Unpaid {
// calls update to redefine the counting of governors
Uint256 [] memory governors = new Uint256 [] (10);
_Governors = 0; // redefines the governor’s count
// Create a temporary matrix and update -a
GovernmentRCourTingSimplestestague Storage Temp = GovernmentRCouTingSimplesToreage (_Governors, governors);
// Update the stored value
Temp._Governors += 1;
// Call to update again to persist the changes
}
`
Conclusion
Updating your smart contract using new structures is a powerful way to improve your performance and safety. By modifying the storage layout, you can create more flexible contracts that can adapt to requirements changes.
When updating, follow these guidelines:
- Avoid mutations directly from the fields of the structure.
- Use the
update function ()to make your update work.
- Call
update ()before and after modifying the fields of the original structure.
By following these recommended practices, you will be able to safely update your smart contract using update structures, unlocking new scalability, performance and safety possibilities in your Ethereum -based applications.