title: Ruby on Rails Adding comments to post
body: <p>i created a comment controller in rails but if i run the server it gives an error in <code>db migrate</code>.</p>
  
  <p>Caused by:</p>
  
  <pre><code>SQLite3::SQLException: table "comments" already exists
  C:/Users/SIBI/Desktop/rails1/hello_world/db/migrate/20190516103017_create_comments.rb:3:in `change'
  bin/rails:4:in `require'
  bin/rails:4:in `&lt;main&gt;'
  Tasks: TOP =&gt; db:migrate
  (See full trace by running task with --trace)
  </code></pre>