I wanted to allow my users to be able to include html tags in things they posted. Originally, I was thinking that this was done as an option to the form field, but it actually is in the view where you display the user content.
In my case, I have this in the form:
<%= f.text_area :content %>
and where you want to display it, just add “.html_safe”, for example:
<%= article.content.html_safe %>