title: How to limit a model to create one record per day?
body: <p>Business logic: A user can only create one entry for a journal per day. Before an entry can be created, it must query the records to determine if an entry has already been created for today.</p>
  
  <p>I was looking for advice on the best way to approach this. I had a few ideas how to implement it on the client-side, but I'd really like to have validation on the model layer instead. Any help would be appreciated.</p>