title: Submit URLs from a data frame column using rvest
body: <p>I have a data frame called <code>dogs</code> that looks like this:</p>
  
  <pre><code>url 
  https://en.wikipedia.org/wiki/Dog
  https://en.wikipedia.org/wiki/Dingo
  https://en.wikipedia.org/wiki/Canis_lupus_dingo
  </code></pre>
  
  <p>I would like to submit all the urls to rvest but I am not sure how to</p>
  
  <p>I tried this </p>
  
  <pre><code>dogstext &lt;-html(dogs$url) %&gt;%
      html_nodes("p:nth-child(4)") %&gt;%
      html_text() 
  </code></pre>
  
  <p>but i got this error</p>
  
  <pre><code>Error in UseMethod("parse") : 
    no applicable method for 'parse' applied to an object of class "factor"
  </code></pre>