title: Oracle Scaffold-DbContext for Net Core not have [Key] attribute? (.net Core v.2.1)
body: <p>I use </p>
  
  <pre><code>Scaffold-DbContext "connectionSTRING" Oracle.EntityFrameworkCore -OutputDir OracleModels -DataAnnotations -force;
  </code></pre>
  
  <p>My expect object Generate have include Attribute [KEY] </p>
  
  <p>My .net core v.2.1 [LTS] and oracle currently only support for ef2.1. (not 3.1)</p>
  
  <p>Thank you.</p>