How to create Associated token Account onchain

Question

Please help i'm trying to create an Associated token account for a PDA onchain using

        let create_accounts = Create {
            payer: ctx.accounts.signer.to_account_info().clone(),
            associated_token: ctx.accounts.token_escrow.to_account_info().clone(),
            authority: ctx.accounts.another_pda.to_account_info().clone(),
            mint: ctx.accounts.token_mint.to_account_info().clone(),
            system_program: ctx.accounts.system_program.to_account_info().clone(),
            token_program: ctx.accounts.token_program.to_account_info().clone(),
            rent: ctx.accounts.rent.to_account_info().clone(),
        };

        let cpi_ctx = CpiContext::new(
            self.associated_token_program.to_account_info().clone(),
            create_accounts,
        );

        anchor_spl::associated_token::create(cpi_ctx)?;

But I'm getting this error

Error: failed to send transaction: Transaction simulation failed: Error processing Instruction 0: An account required by the instruction is missing

Answer 1

it turns out i was generating the Associated token account using the wrong seeds.

Here's the proper way to go about it

import {
  TOKEN_PROGRAM_ID,
} from "@solana/spl-token";

const SPL_ASSOCIATED_TOKEN_ACCOUNT_PROGRAM_ID: PublicKey = new PublicKey(
  'ATokenGPvbdGVxr1b2hvZbsiqW5xWH25efTNsLJA8knL',
);

export async function findAssociatedTokenAddress(
  ownerAddress: PublicKey,
  tokenMintAddress: PublicKey,
  programId: PublicKey = SPL_ASSOCIATED_TOKEN_ACCOUNT_PROGRAM_ID
): Promise<PublicKey> {
  return (await PublicKey.findProgramAddress(
    [
      ownerAddress.toBuffer(),
      TOKEN_PROGRAM_ID.toBuffer(),
      tokenMintAddress.toBuffer(),
    ],
    programId
  ))[0];
}