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Use has_one in Solana: a hidden additional signing requirement
In the state of Solana, the accounts with various restrictions can be defined to ensure the corresponding approval and functionality. Such a restriction is the use of has_one, with which the developer can indicate that an account must have exactly an account for children.
When using has_one with certain rules such as administrator, it is not clear as soon as this happens. A more precise examination shows that adding a second signing request can sometimes lead to unexpected behavior byHas_one, even if only the administrator is declared.
In this article we will deepen the specificity of the use "Has_one" with specific rules for Solana, and we will examine when an additional signing request can be added, even if only the administrator is declared.
Syntaxhas_one
When defining an account with a compulsion likehas_one, Syntax looks like this:
Rust
#[Account(
... ...
Has_one (
Copil_Account: Address,
Child_igner: Address,
),
)]]]]
Here we see that two new fields are added to the account structure:
- Child_Acount: This is the account that must exist with the defined one.
Child_igner: This indicates that only this children’s account can be signed by the respective signatories.
Administrator Signature request
Now let’s think about what happens if you use the signatories’ requirement (has_one (admin)) with a certain rule, e.g. B. “admin:
Rust
#[Account(
... ...
Has_one (
Admin: address,
),
)]]]]
In this scenario, the account is added to an additional signatory request, even if only the administrator account is declared as such.
Capture: It needed a single children's account
When usinghas_one with a certain rule like administrator, it is important to note that the child’s account should not be signed by the administrator. Instead, the administrator must sign his own account, which serves as a child. This is the reason why an additional signing request for the overarching account is added.
Diploma
In summary, it is crucial that a single children’s account is actually necessary and signed by the respective signatories if they are used with certain rules such as administrator. Adding an additional signing request can sometimes lead to unexpected behavior, even if only the administrator is declared as such.
As a developer, it is important to carefully assess the restrictions of each account definition in Solana in order to ensure adequate approval and functionality. If you understand these colors, you can write a more robust and more efficient code that uses the performance of Has_one and at the same time minimizes unnecessary signatory.
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