simple_fields_for doesn't generate input when value for column is nil

Question

I'm trying to load post with no comments, but this form is not shown:

<%= simple_form_for(@task) do |f| %>
  <%= f.simple_fields_for :comments  do |comment| %>
    <%= comment.input :COMM_TEXT, as: :text%>
  <% end %>
<% end %>

How to make it visible if no comments yet for post to add them.

Answer 1

How to make it visible if no comments yet for post to add them.

I suggest you to create a new comment, it's not persist in database, it's just a template for new comment:

<%= simple_form_for(@task) do |f| %>
  <%= f.simple_fields_for :comments, @task.comments.new  do |comment| %>
    <%= comment.input :COMM_TEXT, as: :text%>
  <% end %>
<% end %>

_{Here is a good article about nested forms which I recommend to read.}