title: Prisma query fields where value is a string or ID
body: <p>Sorry, brand new to Prisma queries and trying to figure out the query language syntax.</p>
  
  <p>Given the following call made from my GraphQL / Prisma backend, I'm looking to query <code>{parent: String}</code>. Anything non-<code>null</code> will work here, <code>String</code> isn't accepted, complains about wanting an object. So, it's not types. I also tried <code>{ parent_not: null }</code> with no luck. Sorry for the beginner question, can't find this in the docs.</p>
  
  <p>Bonus points, I'll take any help I can get, but would like to know how to query by <code>ID</code> type values.</p>
  
  <pre><code>    const children = await ctx.db.query.comments(
        {
          where: { AND: [{ isPublic: true }, { parent: String }] },
          orderBy: 'createdAt_DESC'
        },
        info
      )
  </code></pre>