lemmy/crates/db_schema/src/impls/images.rs

use crate::{
  newtypes::DbUrl,
  schema::{local_image, remote_image},
  source::images::{LocalImage, LocalImageForm, RemoteImage, RemoteImageForm},
  utils::{get_conn, DbPool},
};
use diesel::{
  dsl::exists,
  insert_into,
  result::Error,
  select,
  ExpressionMethods,
  NotFound,
  QueryDsl,
};
use diesel_async::RunQueryDsl;
use url::Url;

impl LocalImage {
  pub async fn create(pool: &mut DbPool<'_>, form: &LocalImageForm) -> Result<Self, Error> {
    let conn = &mut get_conn(pool).await?;
    insert_into(local_image::table)
      .values(form)
      .get_result::<Self>(conn)
      .await
  }

  pub async fn delete_by_alias(pool: &mut DbPool<'_>, alias: &str) -> Result<Self, Error> {
    let conn = &mut get_conn(pool).await?;
    diesel::delete(local_image::table.filter(local_image::pictrs_alias.eq(alias)))
      .get_result(conn)
      .await
  }

  pub async fn delete_by_url(pool: &mut DbPool<'_>, url: &DbUrl) -> Result<Self, Error> {
    let alias = url.as_str().split('/').last().ok_or(NotFound)?;
    Self::delete_by_alias(pool, alias).await
  }
}

impl RemoteImage {
  pub async fn create(pool: &mut DbPool<'_>, links: Vec<Url>) -> Result<usize, Error> {
    let conn = &mut get_conn(pool).await?;
    let forms = links
      .into_iter()
      .map(|url| RemoteImageForm { link: url.into() })
      .collect::<Vec<_>>();
    insert_into(remote_image::table)
      .values(forms)
      .on_conflict_do_nothing()
      .execute(conn)
      .await
  }

  pub async fn validate(pool: &mut DbPool<'_>, link_: DbUrl) -> Result<(), Error> {
    let conn = &mut get_conn(pool).await?;

    let exists = select(exists(
      remote_image::table.filter(remote_image::link.eq(link_)),
    ))
    .get_result::<bool>(conn)
    .await?;
    if exists {
      Ok(())
    } else {
      Err(NotFound)
    }
  }
}