<% form_for @post do |f| %> <p> <%= f.label :title %><br /> <%= f.text_field :title %> </p> <p> <%= f.label :content %><br /> <%= f.text_area :content %> </p> <p> <%= f.label :tags %><br /> <%= f.text_field :tags %> </p> <p> <button type="submit">Send</button> </p> <% end %> In this case, the text fields for tags should receive the list of tags separated by comma (See below for how to change the s