This fixes issue #2032. Anyone can now view all comments on a public post without needing to log in.

app/controllers/comments_controller.rb

@@ -4,7 +4,7 @@
 
 class CommentsController < ApplicationController
   include ApplicationHelper
-  before_filter :authenticate_user!
+  before_filter :authenticate_user!, :except => [:index]
 
   respond_to :html, :mobile, :except => :show
   respond_to :js, :only => [:index]
@@ -55,7 +55,12 @@ class CommentsController < ApplicationController
   end
 
   def index
-    @post = current_user.find_visible_post_by_id(params[:post_id])
+    if user_signed_in?
+      @post = current_user.find_visible_post_by_id(params[:post_id])
+    else
+      @post = Post.where(:id => params[:post_id], :public => true).includes(:author, :comments => :author).first
+    end
+
     if @post
       @comments = @post.comments.includes(:author => :profile).order('created_at ASC')
       render :layout => false

app/helpers/comments_helper.rb

@@ -7,6 +7,8 @@ module CommentsHelper
   def comment_toggle(post, commenting_disabled=false)
     if post.comments.size <= 3
       link_to "#{t('stream_helper.hide_comments')}", post_comments_path(post.id), :class => "toggle_post_comments"
+    elsif ! user_signed_in?
+      link_to "#{t('stream_helper.show_more_comments', :number => post.comments.size - 3)}", post_path(post.id, :all_comments => '1'), :class => "toggle_post_comments"
     else
       link_to "#{t('stream_helper.show_more_comments', :number => post.comments.size - 3)}", post_comments_path(post.id), :class => "toggle_post_comments"
     end

app/views/comments/_comments.html.haml

@@ -2,13 +2,13 @@
 -#   licensed under the Affero General Public License version 3 or later.  See
 -#   the COPYRIGHT file.
 .comment_stream
-  - unless comments_expanded
+  - unless comments_expanded || params['all_comments']
     %ul.show_comments{:class => ("hidden" if post.comments.size <= 3)}
       %li
         = comment_toggle( post)
 
   %ul.comments{:class => ('loaded' if post.comments.size <= 3)}
-    -if post.comments.size > 3 && !comments_expanded
+    -if post.comments.size > 3 && !comments_expanded && ! params['all_comments']
       = render :partial => 'comments/comment', :collection => post.comments.last(3), :locals => {:post => post}
     -else
       = render :partial => 'comments/comment', :collection => post.comments, :locals => {:post => post}