Ruby on Rails: undefined method "comments" for nil:NilClass - ruby-on-rails

Question

I am developing an app with users where they each have set of microposts displayed on their pages. I am trying to add comments to these microposts. Every time I visit localhost:3000/users/(user_id_#)
I get this error: undefined method `comments' for nil:NilClass
This error only comes when the user has microposts to show. Otherwise it just shows their blank page. The error comes from this view for app/views/users/show.html.erb This view renders this partial, where the error occurs in line 13.
<li>
<span class="content"><%= micropost.content %></span>
<span class="timestamp">
Posted <%= time_ago_in_words(micropost.created_at) %> ago.
</span>
<% if current_user?(micropost.user) %>
<%= link_to "delete", micropost, method: :delete,
confirm: "You sure?",
title: micropost.content %>
<% end %>
<h2>Comments</h2>
<% micropost.comments.each do |comment| %>
<p>
<b>Commenter:</b>
<%= comment.commenter %>
</p>
<p>
<b>Comment:</b>
<%= comment.body %>
</p>
<% end %>
<h3>Add a comment:</h3>
<%= form_for([micropost, micropost.comments.build]) do |f| %>
<div class="field">
<%= f.label :commenter %><br />
<%= f.text_field :commenter %>
</div>
<div class="field">
<%= f.label :body %><br />
<%= f.text_area :body %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
</li>
Here is my comment.rb file
class Comment < ActiveRecord::Base
belongs_to :micropost
attr_accessible :body, :user_id
end
and my micropost.rb file
class Micropost < ActiveRecord::Base
attr_accessible :content
belongs_to :user
has_many :comments
validates :content, presence: true, length: { maximum: 140 }
validates :user_id, presence: true
end
and my comments_controller.rb
class CommentsController < ApplicationController
def create
#micropost = Micropost.find(params[:micropost_id])
#comment = #micropost.comments.create(params[:comment])
redirect_to micropost_path(#micropost)
end
end
and finally my microposts_controller.rb
class MicropostsController < ApplicationController
before_filter :signed_in_user
before_filter :correct_user, only: :destroy
def create
#micropost = current_user.microposts.build(params[:micropost])
if #micropost.save
flash[:success] = "Micropost created!"
redirect_to root_path
else
#feed_items = []
render 'static_pages/home'
end
end
def new
#micropost = Micropost.new(params[:micropost])
end
def show
#micropost = Micropost.find(params[:id])
end
def destroy
#micropost.destroy
redirect_back_or root_path
end
private
def correct_user
#micropost = current_user.microposts.find_by_id(params[:id])
redirect_to root_path if #micropost.nil?
end
end
class CommentsController < ApplicationController
def create
#micropost = Micropost.find(params[:micropost_id])
#comment = #micropost.comments.create(params[:comment])
redirect_to micropost_path(#micropost)
end
end
also here is the users_controller.rb
class UsersController < ApplicationController
before_filter :signed_in_user,
only: [:index, :edit, :update, :destroy, :following, :followers]
before_filter :correct_user, only: [:edit, :update]
before_filter :admin_user, only: :destroy
def index
#users = User.paginate(page: params[:page])
end
def show
#user = User.find(params[:id])
#micropost = #user.microposts.first
#comment = Comment.new
end
def new
#user = User.new
end
def create
#user = User.new(params[:user])
if #user.save
sign_in #user
flash[:success] = "Welcome to the Sample App!"
redirect_to #user
else
render 'new'
end
end
def edit
end
def update
if #user.update_attributes(params[:user])
flash[:success] = "Profile updated"
sign_in #user
redirect_to #user
else
render 'edit'
end
end
def destroy
User.find(params[:id]).destroy
flash[:success] = "User destroyed."
redirect_to users_path
end
def following
#title = "Following"
#user = User.find(params[:id])
#users = #user.followed_users.paginate(page: params[:page])
render 'show_follow'
end
def followers
#title = "Followers"
#user = User.find(params[:id])
#users = #user.followers.paginate(page: params[:page])
render 'show_follow'
end
private
def correct_user
#user = User.find(params[:id])
redirect_to(root_path) unless current_user?(#user)
end
def admin_user
redirect_to(root_path) unless current_user.admin?
end
end
from the error it sounds like the #micropost isnt being initialized in the microposts_controller.rb file under def show. but I think it is? What am I doing wrong? Thanks
also here is app/views/users/show.html.erb
<% provide(:title, #user.name) %>
<div class="row">
<aside class="span4">
<section>
<h1>
<%= gravatar_for #user %>
<%= #user.name %>
</h1>
</section>
</aside>
<div class="span8">
<%= render 'follow_form' if signed_in? %>
<% if #user.microposts.any? %>
<h3>Microposts (<%= #user.microposts.count %>)</h3>
<ol class="microposts">
<%= render #microposts %>
</ol>
<%= will_paginate #microposts %>
<% end %>
</div>
</div>

Answer 1

I suspect the error is here in your partial:
<% #micropost.comments.each do |comment| %>
I am assuming that you are iterating over #microposts and passing each micro post to your partial as micropost. In the above line you are using the instance variable #micropost when you should be using the local micropost.
Update: and also here:
<%= form_for([#micropost, #micropost.comments.build]) do |f| %> –

Answer 2

Could you try to change this #microposts = #user.microposts.paginate(page: params[:page]) into this #micropost = #user.microposts.first and see if it works ?
I think since the partial is rendered in the context of users#show that why #micropost is nil.
This is not an answer, I just want to comment but I don't have enough reputation points.