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Update intelligent contracts with new fields: how to safely change the storage layout
As a developer who works on intelligent contracts based on Ethereum, you are probably familiar with the concept of updating the code base to incorporate new features. In this article, we will explore how to safely update the existing intelligent contract using models of intelligent contracts that can be updated and introduce a new structure called government government.
Background
In recent times, the developers have experienced updating intelligent contracts, which use special properties such as Udisbili () is removable () to allow greater flexibility in the code. These updates can improve scalability, performance and safety of the contract. A common approach is to create new structures that modify the existing storage layout.
GovernmentSimplestorage upgrade
Suppose that you have a structure called Governmentingsimplestoralge with existing fields:
Solidity
// government
Stuct GovernmentTingsimplestorage {
Uint256 _governors: Uint256;
}
`
To update this contract, we must create a new structure that changes the storage layout. We can achieve this by adding new fields that are not already defined in the original structure.
Solidity
// government
Pragma solidity ^0.8.0;
Stuct GovernmentTingsimplestorage {
Uint256 _governors;
Uint256 [] governors; // New field: Governmentcountingsimplestorage government
}
CONSTRUTOR () public {
_Governors = 10; // Initial value for the Governorcountingsimplestoracge array
}
`
In this updated version, we have added a new fieldgovernment to the government which stores a series of values of Uint256. This new field is not part of the original structure and has a different name.
Modifying storage layout safely
To safely change the storage layout, it is always necessary to follow these guidelines:
- Avoid changing the Struct fields directly: use the new structure to create a temporary array and then update it.
- ** Use the functionUpgradable ()
: to make your update work, you need to callUpgradable ()on the original structure before changing its fields.
We demonstrate this with an example:
Solidity
// government
Pragma solidity ^0.8.0;
Stuct GovernmentTingsimplestorage {
Uint256 _governors;
}
Contract GovernTorcuntingsimplestoRageugrade is updated {
Getgovernor function () Public View Returns (Uint256) {
return _governors;
}
}
Upgradable function () pure virtual interior not payable {
// calls Upmis to restore the governor’s counting
Uint256 [] Memory governors = New Uint256 [] (10);
_Governors = 0; // reset the governor’s count
// Create a temporary array and update it
Governorcountsimplestorali storage temp = government government (_gvernornors, governors);
// Update the stored value
temp._governors += 1;
// calls again upgradeable to persist the changes
}
`
Conclusion
The updating of the intelligent contract using new structures is a powerful way to improve its performance and safety. By changing the storage layout, it is possible to create more flexible contracts capable of adapting to the modification requirements.
When updating, be sure to follow these guidelines:
- Avoid changing the Struct fields directly.
- Use the functionUpgradable ()
to make your update work.
- Call
Upgradable ()before and after having changed the fields of the original structure.
Following these best practices, you will be able to make your intelligent contract safely updating updating structures, unlock new scalability, performance and safety possibilities in your applications based on Ethereum.