protected override IEnumerable <CommandDefinition> GetCommand(object evt)
{
return(evt switch
{
ArticlePublished e => ArrayOf(new ArticleInsertCommand(e).Command, new TagBatchInsert(e).Command),
ArticleDeleted e => ArrayOf(
new CommandDefinition("delete from Tags where ArticleId=@ArticleId", e),
new CommandDefinition("delete from Favorites where ArticleId=@ArticleId", e),
new CommandDefinition("delete from Articles where ArticleId=@ArticleId", e)),
ArticleFavorited e => ArrayOf(
new CommandDefinition("insert into Favorites (ArticleId, UserId) values (@ArticleId, @UserId)", e),
new CommandDefinition("update Articles set FavoriteCount=FavoriteCount+1 where ArticleId=@ArticleId", e)),
ArticleUnfavorited e => ArrayOf(
new CommandDefinition("delete from Favorites where ArticleId=@ArticleId and UserId=@UserId", e),
new CommandDefinition("update Articles set FavoriteCount=FavoriteCount-1 where ArticleId=@ArticleId", e)),
BodyUpdated e => ArrayOf(new CommandDefinition("update Articles set Body=@Body, UpdatedDate=@UpdatedAt where ArticleId=@ArticleId", e)),
DescriptionUpdated e => ArrayOf(new CommandDefinition("update Articles set Description=@Description, UpdatedDate=@UpdatedAt where ArticleId=@ArticleId", e)),
TitleUpdated e => ArrayOf(new CommandDefinition("update Articles set Title=@Title, TitleSlug=@TitleSlug, UpdatedDate=@UpdatedAt where ArticleId=@ArticleId", e)),
_ => Array.Empty <CommandDefinition>()
});
private void OnDescriptionUpdated(DescriptionUpdated e) => Description = e.Description;
