new controller: scaffolding nested resources needs improvement

The following command doesn't work yet:

bud new controller posts/comments index new

The problems are the following:

1. Currently the generated view/posts/comments/index.svelte contains a missing comment variable:

   
   <script>
     export let comments = []
   </script>
   
   <h1>Comment Index</h1>
   
   <table border="1" cellpadding="10">
     {#if comments.length > 0}
       <thead>
         {#each Object.keys(comments[0]) as key}
           <th>{key}</th>
         {/each}
       </thead>
     {/if}
     {#each comments as comment}
       <tr>
         {#each Object.keys(comment) as key}
           {#if key.toLowerCase() === "id"}
             <td><a href={`/posts/${comment.post_id || 0}/comments/${comment.id || 0}`}>{comment[key]}</a></td>
           {:else}
             <td>{comment[key]}</td>
           {/if}
         {/each}
       </tr>
     {/each}
   </table>
   
   <br />
   
   <a href={`/posts/${comment.post_id || 0}/comments/new`}>New Comment</a>
   
   <style>
     table {
       border-collapse: collapse;
     }
   </style>
   

   Right now it's not clear how we should pass this through. Also open to other ideas like using the URL path instead.

2. posts/comments/new.svelte has a similar problem. It generates a file that is missing comment variable. This variable isn't needed when the scaffolding is unnested.

   <h1>New Comment</h1>
   
   <form method="post" action={`/posts/${comment.post_id || 0}/comments`}>
     <!-- Add input fields here -->
     <input type="submit" value="Create Comment" />
   </form>
   
   <br />
   
   <a href={`/posts/${comment.post_id || 0}/comments`}>Back</a>
   

   In this case, just a bit more work needs to be done to conditionally introduce a script tag.

Start by running bud new controller posts/comments index new and inspect the generated view/posts/comments/index.svelte and posts/comments/new.svelte. Compare nested output with unnested scaffolding, then make the generated links and form work without undefined variables and verify that the conditional script handling is correct.