Remove a comment if user does not exist Ruby on Rails -

i error undefined method 'email' nil:nilclass when try access post comment user has been deleted in db.

i wonder: how can remove comments has been created users no longer exists "on fly"?

i tried this

<%= div_for(comment) %>     <% if comment.user.email.nil?%>         <% comment.destroy %>     <%else%>         <p><%= comment.body %></p>         <p class="comment-submitted-by"><%= time_ago_in_words(comment.created_at) %> ago         <%= comment.user.email %></p>     <%end%>  

but still error.

you're still getting error because you've referenced comment.user.email, , user nil. need check comment.user.nil?, or you're @ risk deleting comment because user's email missing (though maybe disallow that):

<% if comment.user.nil? %>   <% comment.destroy %> 

---

cleaning on fly going finicky , cumbersome. looks want dependent: :destroy on user#comments association.

class user   has_many :comments, dependent: :destroy end 

then when user removed, of comments too, , don't have worry @ display time.

since there existing orphaned comments, can clean them out simple sql statement:

delete comments user_id not in (   select id users ) 

or rails console:

comments.find_each { |c| c.destroy if c.user.nil? }