如何在Solana程序中引用具有多个帐户的特定帐户

Question

此程序允许用户创建一个帐户来接收资金。所以"爱丽丝"可以创建帐户筹款人。在"筹款人"中，有一个特定的变量amount_raised，用于跟踪有多少SOL被发送到她的账户。该计划允许多人创建新的筹款人。。那么，如何在函数"捐赠"中引用正确的帐户？我怀疑我需要使用PDA，或者至少迭代所有程序帐户，并将其与创建者的公钥匹配。提前谢谢。(Sol是在客户端发送的，我只想通过添加金额来跟踪金额(。

use super::*;
pub fn donate(ctx: Context<Donate>, amount: u32) -> ProgramResult {
let fundraiser: &mut Account<Fundraiser> = &mut ctx.accounts.fundraiser;
let user: &Signer = &ctx.accounts.user;
fundraiser.amount_raised += amount;
Ok(())
}

pub fn start_fund(ctx: Context<StartFund>, amount: u32, reason: String) -> ProgramResult {
let fundraiser: &mut Account<Fundraiser> = &mut ctx.accounts.fundraiser;
let author: &Signer = &ctx.accounts.author;
let clock: Clock = Clock::get().unwrap();
if reason.chars().count() > 350 {
return Err(ErrorCode::ContentTooLong.into())
}
fundraiser.author = *author.key;
fundraiser.amount_to_raise = amount;     
fundraiser.timestamp = clock.unix_timestamp;
fundraiser.reason = reason;
Ok(())
}    
pub struct StartFund<'info> {
#[account(init, payer = author, space = 64 + 64)]
pub fundraiser: Account<'info, Fundraiser>,
#[account(mut)]
pub author: Signer<'info>,
#[account(address = system_program::ID)]
pub system_program: AccountInfo<'info>,
}    
#[derive(Accounts)]
pub struct Donate<'info> {
#[account(mut)]
pub fundraiser: Account<'info, Fundraiser>,
#[account(mut)]
pub user: Signer<'info>,
#[account(address = system_program::ID)]
pub system_program: AccountInfo<'info>,
}        
#[account]
pub struct Fundraiser { 
pub author: Pubkey,
pub amount_to_raise: u32,
pub amount_raised: u32,
pub timestamp: i64,
pub reason: String, //reason
}

}`

Answer 1

您基本上做对了——在Donate指令中，您还需要传入Alice的author帐户，以便在Donate期间将资金从user转移到author。因此，它看起来像：

#[derive(Accounts)]
pub struct Donate<'info> {
#[account(mut)]
pub fundraiser: Account<'info, Fundraiser>,
#[account(mut)]
pub user: Signer<'info>,
#[account(mut)]
pub author: AccountInfo<'info>,
#[account(address = system_program::ID)]
pub system_program: AccountInfo<'info>,
}

您必须检查提供的author是否与fundraiser.author匹配。