+ if let Some(languages) = data.discussion_languages.clone() {
+ let site_languages: Vec<LanguageId> =
+ blocking(context.pool(), SiteLanguage::read_local).await??;
+ // check that community languages are a subset of site languages
+ // https://stackoverflow.com/a/64227550
+ let is_subset = languages.iter().all(|item| site_languages.contains(item));
+ if !is_subset {
+ return Err(LemmyError::from_message("language_not_allowed"));
+ }
+ blocking(context.pool(), move |conn| {
+ CommunityLanguage::update(conn, languages, community_id)
+ })
+ .await??;
+ }
+