Function get_for_user 

pub async fn get_for_user(
    db: &SqlitePool,
    group_id: Uuid,
    user_id: Uuid,
) -> Result<GroupView, Error>

Fetch a single group view if the user is a member of it.

Errors

Returns Error::Database on query failure or Error::NotFound if the group does not exist or the user is not a member.