title: Where is the CSV gem in Rails?
body: <p>I’m using Rails 4.2 with Ruby 2.3.0.  I want to use the CSV parsing library, which according to the documentation is part of the core Ruby distribution — <a href="https://ruby-doc.org/stdlib-2.0.0/libdoc/csv/rdoc/CSV.html" rel="nofollow noreferrer">https://ruby-doc.org/stdlib-2.0.0/libdoc/csv/rdoc/CSV.html</a> .  However, when I put this on my page</p>
  
  <pre><code>csv = CSV.parse(text_content, :headers =&gt; true)
  </code></pre>
  
  <p>it results in this error</p>
  
  <pre><code>Error during processing: uninitialized constant CsvToActivityConverterService::CSV
  </code></pre>
  
  <p>Do I need another gem to include the CSV library in my Rails project?</p>