NoMethodError in Spree::Admin::Reviews#index

[cliffcleetus]

Getting error while clicking the 'reviews' in the spree admin panel.

index.html.erb

   `  <% content_for :page_title do %>
      <%= Spree.t('reviews') %>
      <% end %>

      <% render 'spree/admin/shared/product_sub_menu' %>

      <% content_for :table_filter_title do %>
      <%= Spree.t('search') %>
      <% end %>

      <% content_for :table_filter do %>
      <div data-hook="admin_reviews_index_search">

      <%= search_form_for [:admin, @search] do |f| %>
      <div class="alpha three columns">
      <div class="field">
      <%= label_tag nil, Spree.t(:user) %><br />
      <%= f.text_field :name_cont, :size => 25 %>
      </div>
      </div>

      <div class="seven columns">
      <div class="field">
      <%= label_tag nil, Spree.t(:title) -%><br/>
      <%= f.text_field :title_cont, :size => 25  -%>
      </div>
      </div>

      <div class="four columns">
      <div class="field">
      <%= label_tag nil, Spree.t(:review) -%><br/>
      <%= f.text_field :review_cont, :size => 25  -%>
      </div>
      </div>

      <div class="two columns omega">
      <div class="field">
      <%= label_tag nil, Spree.t(:approval_status)-%><br/>
      <%= f.select :approved_eq, [[Spree.t('all'), nil], [Spree.t('approved_reviews'), true], [Spree.t('unapproved_reviews'), false]]  -%>
      </div>
      </div>

      <div class="clear"></div>

      <div class="form-buttons actions filter-actions" data-hook="admin_reviews_index_search_buttons">
      <%= button Spree.t(:search), 'icon-search' %>
      </div>
      <%- end -%>
      </div>
      <%- end -%>
      <pre>
      <%= Spree::Review.inspect %>
      <%= params[:q][:title_cont].inspect %>

      <% if params[:q][:title_cont].present? == true %>
      <%= @reviews.inspect %>
      <%end%>  
      </pre>
      <% if @reviews.nil? %>
      <table class="index">
      <colgroup>
      <col style="width: 25%;">
      <col style="width: 10%;">
      <col style="width: 10%;">
      <col style="width: 20%;">
      <col style="width: 15%;">
      <col style="width: 17%;">
      </colgroup>
      <thead>
      <tr>
      <th><%= Spree.t('product') %></th>
      <th><%= Spree::Review.human_attribute_name(:rating) %></th>
      <th><%= Spree.t('feedback') %></th>
      <th><%= Spree::Review.human_attribute_name(:user) %></th>
      <th><%= Spree::Review.human_attribute_name(:created_at) %></th>
      </tr>
      </thead>
      <tbody>
      <%- @reviews.each do |review| -%>
      <tr id="<%= dom_id review %>">
      <td>
      <% if review.product %>
      <%= link_to review.product.name, product_path(review.product) %>
      <% end %>
      </td>
      <td class="align-center">
      <%= txt_stars(review.rating) %>
      </td>
      <td class="align-center">
      <%= link_to "(#{review.feedback_stars}/#{review.feedback_reviews.size})", admin_review_feedback_reviews_path(review) %>
      </td>
      <td class="align-center">
      <%= review.user_id ? link_to(review.user.try(:email), [:admin, review.user]) : Spree.t(:anonymous) %></p>
      <p><%= Spree::Review.human_attribute_name(:ip_address) %>: <%= review.ip_address ? link_to(review.ip_address, "http://whois.domaintools.com/#{review.ip_address}") : '-' %></p>
      </td>
      <td class="align-center">
      <%= l review.created_at, :format => :short %>
      </td>
      <td class="actions">
      <%= link_to_with_icon 'check', Spree.t('approve'), approve_admin_review_url(review), :no_text => true, class: 'approve' unless review.approved %>
      &nbsp;
      <%= link_to_edit review, :no_text => true, :class => 'edit' %>
      &nbsp;
      <%= link_to_delete review, :no_text => true %>
      </td>
      </tr>
      <% end %>
      </tbody>
      </table>
      <% else %>
      <div class="no-objects-found">
      <%= Spree.t(:no_results) %>
      </div>
      <% end %>

`
Model - review.rb

   `class Spree::Review < ActiveRecord::Base

      belongs_to :product, touch: true
      belongs_to :user, :class_name => Spree.user_class.to_s
      has_many   :feedback_reviews

      after_save :recalculate_product_rating, :if => :approved?
      after_destroy :recalculate_product_rating

      validates :name, presence: true
      validates :review, presence: true

      validates :rating, numericality: { only_integer: true,
      greater_than_or_equal_to: 1, 
      less_than_or_equal_to: 5,
      message: Spree.t('you_must_enter_value_for_rating') }


      default_scope { order("spree_reviews.created_at DESC") }

      scope :localized, ->(lc) { where('spree_reviews.locale = ?', lc) }
      scope :most_recent_first, -> { order('spree_reviews.created_at DESC') }
      scope :oldest_first, -> { reorder('spree_reviews.created_at ASC') }
      scope :preview, -> { limit(Spree::Reviews::Config[:preview_size]).oldest_first }
      scope :approved, -> { where(approved: true) }
      scope :not_approved, -> { where(approved: false) }
      scope :default_approval_filter, -> { Spree::Reviews::Config[:include_unapproved_reviews] ? all : approved }

      def feedback_stars
      return 0 if feedback_reviews.size <= 0
      ((feedback_reviews.sum(:rating) / feedback_reviews.size) + 0.5).floor
      end

      def set_search
      @search=Product.search(params[:q])
      end

      def recalculate_product_rating
      self.product.recalculate_rating if product.present?
      end
      end

`

reviews_controller.rb:

     ` class Spree::Admin::ReviewsController < Spree::Admin::ResourceController
      helper Spree::ReviewsHelper
      def index
      @reviews = collection
      end

      def approve
      r = Spree::Review.find(params[:id])

      if r.update_attribute(:approved, true)
      flash[:notice] = Spree.t("info_approve_review")
      else
      flash[:error] = Spree.t("error_approve_review")
      end
      redirect_to admin_reviews_path
      end

      def edit
      if @review.product.nil?
      flash[:error] = Spree.t("error_no_product")
      redirect_to admin_reviews_path and return
      end
      end

      private

      def collection
      params[:q] ||= {}
      @search = Spree::Review.ransack(params[:q])
      @collection = @search.result.includes([:product, :user, :feedback_reviews]).page(params[:page]).per(params[:per_page])
      end
      end`

Gemfile:

`source 'https://rubygems.org'
 gem 'rails', '>= 4.0.8'

 # Use sqlite3 as the database for Active Record
 gem 'mysql2', '~> 0.3.18'

 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 4.0.2'
 gem 'compass-rails'

 # Provides the generator settings required for Rails to use Haml
 gem 'haml-rails'

 # Use Uglifier as compressor for JavaScript assets
 gem 'uglifier', '>= 1.3.0'

 # Use CoffeeScript for .js.coffee assets and views
 gem 'coffee-rails', '~> 4.0.0'
 gem 'jquery-rails'
 gem 'bootstrap-sass', '~> 3.1.1'
 gem 'jbuilder', '~> 1.2'
 group :doc do
 gem 'sdoc', require: false
 end
gem 'braintree'
gem 'spree', github: 'spree/spree', branch: '2-2-stable'
gem 'spree_auth_devise', github: 'spree/spree_auth_devise', branch: '2-2-stable'
gem 'spree_gateway', github: 'spree/spree_gateway', branch: '2-2-stable'
gem 'spree_editor', github: 'spree-contrib/spree_editor', branch: '2-2-stable'
gem 'spree_blogging_spree', github: 'stefansenk/spree-blogging-spree', branch: '2-2-stable'
gem 'spree_paypal_express', github: 'spree-contrib/better_spree_paypal_express', branch: '2-2-stable'
gem 'spree_reviews', github: 'spree-contrib/spree_reviews', branch: '2-2-stable'
gem 'spree_variant_options', git: 'git://github.com/AgilTec/spree_variant_options.git', branch: '2-2-stable'
gem 'social-share-button'
gem 'instagram',  :git => 'git://github.com/Instagram/instagram-ruby-gem.git'
gem 'will_paginate','~> 3.1.5'




gem 'capistrano', '~> 3.2.0'
gem 'capistrano-rails', '~> 1.1'
gem 'capistrano-rvm'
gem 'capistrano-bundler', '~> 1.1.2'

gem 'therubyracer'

gem 'mail_view', '~> 2.0.4'

group :production do
  gem 'passenger'
end

# Use ActiveModel has_secure_password
# gem 'bcrypt', '~> 3.1.7'

# Use unicorn as the app server
# gem 'unicorn'

# Use Capistrano for deployment
# gem 'capistrano', group: :development

# Use debugger
# gem 'debugger', group: [:development, :test]

`