You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: follow.rs
    path of file: ./repos/lemmy/crates/apub/src/activities/following
    
    the code of the file until where you have to start completion: use crate::{
  activities::{
    generate_activity_id,
    send_lemmy_activity,
    verify_person,
    verify_person_in_community,
  },
  fetcher::user_or_community::UserOrCommunity,
  insert_received_activity,
  objects::{community::ApubCommunity, person::ApubPerson},
  protocol::activities::following::{accept::AcceptFollow, follow::Follow},
};
use activitypub_federation::{
  config::Data,
  kinds::activity::FollowType,
  protocol::verification::verify_urls_match,
  traits::{ActivityHandler, Actor},
};
use lemmy_api_common::context::LemmyContext;
use lemmy_db_schema::{
  source::{
    activity::ActivitySendTargets,
    community::{CommunityFollower, CommunityFollowerForm},
    person::{PersonFollower, PersonFollowerForm},
  },
  traits::Followable,
  CommunityVisibility,
};
use lemmy_utils::erro
    
  async fn receive(self, context: &Data<LemmyContext>) -> Result<(), LemmyError> {
    insert_received_activity(&self.id, context).await?;
    let actor = self.actor.dereference(context).await?;
    let object = self.object.dereference(context).await?;
    match object {
      UserOrCommunity::User(u) => {
        let form = PersonFollowerForm {
          person_id: u.id,
          follower_id: actor.id,
          pending: false,
        };
        PersonFollower::follow(&mut context.pool(), &form).await?;
      }
      UserOrCommunity::Community(c) => {
        // Dont allow following local-only community via federation.
        if c.visibility != CommunityVisibility::Public {
          return Err(LemmyErrorType::CouldntFindCommunity.into());
        }
        let form = CommunityFollowerForm {
          community_id: c.id,
          person_id: actor.id,
          pending: false,
        };
        CommunityFollower::follow(&mut context.pool(), &form).await?;
      }
    }

    AcceptFollow::send(self, context).await
  }