Ok i found the solution:
http://stackoverflow.com/questions/7195473/rails-3-why-is-my-postshow-view-showing-all-of-its-comments-database-data-in


The problem is in the view perhaps you have  =


it's the = in the @comments.each tag. It is returning the result of 
each, which is the whole array.

For example:

irb> [1,2].each {|i| puts i }
1
2
=> [1, 2]
So:

<%= @comments.each do |comment| %>
Should simply be:

<% @comments.each do |comment| %>


I hope that works for you.

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