NameError in Discussions#index - ruby-on-rails

Question

Im trying to write an ruby app that lets you post discussions and comment on posts. The issue is that I cant get the comments- here called microposts, to show up below the discussions. Right now, im getting the error NameError in Discussions#index: undefined local variable or method `discussion' for #<#:0x0000010563a1e0>. Any ideas?
the micropost form
<% #micropost = Micropost.new %>
<%= form_for(#micropost) do |f| %>
<%= render 'shared/error_messages', object: f.object %>
<div class="field">
<%= f.text_area :content, placeholder: "Compose new micropost..." %>
</div>
<%= f.hidden_field :discussion_id, discussion.id%>
<%= f.submit "Post", class: "btn btn-large btn-primary" %>
<% end %>
micropost controller
class MicropostsController < ApplicationController
before_filter :signed_in_user, only: [:create, :destroy]
def index
end
def create
#discussion = current_user.discussions.new
#micropost = current_user.microposts.build(params[:micropost])
if #micropost.save
flash[:success] = "Posted!"
redirect_to root_url
else
render 'static_pages/home'
end
end
def destroy
end
end
discussion controller
class DiscussionsController < ApplicationController
before_filter :signed_in_user, only: [:index, :edit, :update]
def show
#user = User.find(params[:id])
#discussions = #user.discussion.paginate(page: params[:page])
#microposts = #user.micropost.paginate(page: params[:page])
end
def index
#discussions = Discussion.all
end
def create
#discussion = current_user.discussions.build(params[:discussion])
if #discussion.save
flash[:success] = "Discussion Started!"
redirect_to root_url
else
render 'static_pages/home'
end
end
def destroy
end
def edit
end
def update
end
def new
end
end
discussion view
<% content_for :script do %>
<%= javascript_include_tag 'hover_content' %>
<% end %>
<li>
<div class = "intro-bar"><span class = "intro"><%=discussion.intro %></span></div>
<div class = "content-bar">
<span class = "content"><%= discussion.content %></span>
<div class = "buttons">
<div class = "vote-neg"><%= link_to "Break Up", signup_path,class: "btn btn-large btn-breakup" %></div>
<div class = "vote-plus"><%= link_to "Stay Together", signup_path,class: "btn btn-large btn-staytogether" %></div>
</div>
</div>
</li>
<span class = "timestamp">
Posted <%= time_ago_in_words(discussion.created_at) %> ago.
</span>
<div class = "comments">
<% discussion.microposts.each do |micropost| %>
<li>
<div class = "post-comment"><%= micropost.content%></div>
</li>
<% end %>
</div>
<% if signed_in? %>
<div class = "row">
<aside class = "span4">
<section>
<%= render 'shared/micropost_form', :locals => {:discussion => discussion }%>
</section>
</aside>
</div>
<% end %>
thanks for the help, im sure its something really simple. Im quite new at this

Answer 1

In this code,
class DiscussionsController < ApplicationController
before_filter :signed_in_user, only: [:index, :edit, :update]
def show
#user = User.find(params[:id])
#discussions = #user.discussion.paginate(page: params[:page])
#microposts = #user.micropost.paginate(page: params[:page])
end
it looks like #user.discussion is your problem. Should probably be #user.discussions. Likewise with the next line, #user.microposts

Answer 2

I suppose you show discussion with show method. But, in show method and everywhere else in controller except create you declare #discussions.
I actually can't get, why in show method you do what suits more for index method, but anyway, Rails pass variable from controller to views if it is declared as instance (with #).
So, to define variale in views, you should have #discussion in relative controller method, and locals should also pass #discussion:
:locals => {:discussion => #discussion }