Ruby on Rails

You want to set your comment variable in the controller:

def new
@comment = @post.comments.build
end

so your form is

<%= form_for([@post, @comment]) do |f| %>
<%= render"shared/error_messages", :target => @comment %>
<% end %>

If you build the comment in the form (which you shouldn't be doing
anyways if you're sticking to MVC principles), then when you render the
form, a new comment object is always created. Since it's a new object,
it won't have any errors.

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