Initial attempt at comments

Gemfile

@@ -21,6 +21,7 @@ gem 'bootstrap-sass'
 gem 'simple_form'
 
 gem 'friendly_id', '~> 5.1.0'
+gem 'ancestry'
 
 gem 'bcrypt'
 

Gemfile.lock

@@ -41,6 +41,8 @@ GEM
       ice_nine (~> 0.11.0)
       memoizable (~> 0.4.0)
     addressable (2.3.8)
+    ancestry (2.1.0)
+      activerecord (>= 3.0.0)
     arel (6.0.0)
     arrayfields (4.9.2)
     ast (2.0.0)
@@ -365,6 +367,7 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
+  ancestry
   bcrypt
   better_errors
   binding_of_caller

app/assets/javascripts/comments.coffee

@@ -0,0 +1,3 @@
+# Place all the behaviors and hooks related to the matching controller here.
+# All this logic will automatically be available in application.js.
+# You can use CoffeeScript in this file: http://coffeescript.org/

app/assets/stylesheets/comments.scss

@@ -0,0 +1,3 @@
+// Place all the styles related to the Comments controller here.
+// They will automatically be included in application.css.
+// You can use Sass (SCSS) here: http://sass-lang.com/

app/assets/stylesheets/custom.scss

@@ -42,6 +42,10 @@ $navbar-default-link-hover-color: #369;
   }
 }
 
+.links {
+  font-size: .8em;
+}
+
 .navbar {
   .logo {
     margin-top: 3px;
@@ -49,32 +53,7 @@ $navbar-default-link-hover-color: #369;
   }
 }
 
-.posts {
-  .post {
-    p {
-      margin-bottom: 1px;
-    }
-
-    .title {
-      font-size: 1.2em;
-    }
-
-    .details {
-      font-size: .8em;
-    }
-
-    .links {
-      font-size: .8em;
-    }
-
-    .content {
-      border: 1px solid #369;
-      background-color: #fafafa;
-      border-radius: 7px; // need to work all browsers
-      padding: 5px;
-    }
-  }
-
+.contents {
   ul {
     list-style: none;
     list-style-type: none;
@@ -90,6 +69,38 @@ $navbar-default-link-hover-color: #369;
   li:first-child {
     padding-left: 0px;
   }
+
+  p {
+    margin-bottom: 1px;
+  }
+
+  .title {
+    font-size: 1.2em;
+  }
+
+  .details {
+    font-size: .8em;
+  }
+}
+
+.posts {
+  .post {
+    margin: 0 0 15px 0;
+
+    .content {
+      margin: 4px 0 4px 0;
+      border: 1px solid #369;
+      background-color: #fafafa;
+      border-radius: 7px; // need to work all browsers
+      padding: 5px;
+    }
+  }
+}
+
+.comments {
+  .comment {
+    margin: 15px 0 15px 0;
+  }
 }
 
 .navbar-custom {
@@ -99,3 +110,15 @@ $navbar-default-link-hover-color: #369;
 .main {
   margin: 0 5px 0 5px;
 }
+
+.title {
+  font-size: 1.3em;
+}
+
+.nested_comments {
+  margin-left: 50px;
+}
+
+.in-page {
+  padding: 5px;
+}

app/controllers/comments_controller.rb

@@ -0,0 +1,62 @@
+class CommentsController < ApplicationController
+  before_filter :set_comment, only: [:show, :edit, :update, :destroy]
+  before_filter :set_post
+  before_filter :set_subcreddit
+
+  def show
+    @comments = @comment.subtree.arrange(order: :created_at)
+  end
+
+  def new
+    @comment = Comment.new(params[:parent_id])
+  end
+
+  def create
+    @comment = @post.comments.build comment_params
+    @comment.user = current_user
+
+    if @comment.save
+      flash[:notice] = 'Comment saved'
+    else
+      flash[:alert] = 'Comment could not be saved'
+    end
+
+    redirect_to subcreddit_post_path(@subcreddit, @post)
+  end
+
+  def edit
+  end
+
+  def update
+    if @comment.update comment_params
+      redirect_to subcreddit_post_path(@subcreddit, @post),
+        notice: 'Comment updated'
+    else
+      render :edit
+    end
+  end
+
+  def destroy
+    @comment.destroy
+    redirect_to subcreddit_post_path(@subcreddit, @post),
+      notice: 'Comment deleted'
+  end
+
+  private
+
+  def set_subcreddit
+    @subcreddit = Subcreddit.friendly.find(params[:subcreddit_id])
+  end
+
+  def set_post
+    @post = Post.find(params[:post_id])
+  end
+
+  def set_comment
+    @comment = Comment.find(params[:id])
+  end
+
+  def comment_params
+    params.require(:comment).permit(:parent_id, :content)
+  end
+end

app/controllers/posts_controller.rb

@@ -3,6 +3,7 @@ class PostsController < ApplicationController
   before_filter :set_subcreddit
 
   def show
+    @comments = @post.comments.arrange(order: :created_at)
   end
 
   def new

app/helpers/application_helper.rb

@@ -6,11 +6,11 @@ module ApplicationHelper
   private
 
   def bootstrap_classes
-  {
-    'alert'   => 'alert-warning',
-    'error'   => 'alert-danger',
-    'notice'  => 'alert-info',
-    'success' => 'alert-success'
-  }
-end
+    {
+      'alert'   => 'alert-warning',
+      'error'   => 'alert-danger',
+      'notice'  => 'alert-info',
+      'success' => 'alert-success'
+    }
+  end
 end

app/helpers/comments_helper.rb

@@ -0,0 +1,10 @@
+module CommentsHelper
+  def nested_comments(comments)
+    comments.map do |comment, sub_comments|
+      render(comment, post: comment.post, subcreddit: comment.post.subcreddit) +
+        content_tag(:div,
+                    nested_comments(sub_comments),
+                    class: 'nested_comments')
+    end.join.html_safe
+  end
+end

app/models/comment.rb

@@ -0,0 +1,22 @@
+class Comment < ActiveRecord::Base
+  has_ancestry
+
+  belongs_to :user
+  belongs_to :post, counter_cache: true
+
+  delegate :username, to: :user, prefix: true
+
+  validates :content, presence: true
+
+  def content
+    destroyed? ? '[deleted]' : read_attribute(:content)
+  end
+
+  def destroy
+    update_attribute(:deleted_at, Time.now)
+  end
+
+  def destroyed?
+    self.deleted_at != nil
+  end
+end

app/models/post.rb

@@ -2,6 +2,8 @@ class Post < ActiveRecord::Base
   belongs_to :user
   belongs_to :subcreddit
 
+  has_many :comments
+
   delegate :username, to: :user, prefix: true
 
   validates :title,
@@ -12,6 +14,16 @@ class Post < ActiveRecord::Base
     length: { maximum: 15000 }
 
   def to_param
+    # This "just works" because of the way Rails IDs work.  .to_i must be run on
+    # any incoming ID.  "1-title-parameterized" will automatically be converted
+    # to 1 and "2-title-paramerterized-with-number-2" will automatically be
+    # converted to 2.  This gives us desired functionality without adding code
+    # to properly handle retrieving based on slug.  Hopefully, this does not
+    # cause issues later on.
     "#{self.id}-#{self.title.parameterize}"
   end
+
+  def comments?
+    self.comments_count != 0
+  end
 end

app/views/comments/_comment.html.slim

@@ -0,0 +1,13 @@
+.comment
+  p.details= "#{comment.user_username} X points #{distance_of_time_in_words comment.created_at, Time.now} ago"
+  p.content= comment.content
+  ul.links.list-inline
+    li= link_to 'permalink', subcreddit_post_comment_path(subcreddit, post, comment)
+    li= link_to 'save', ''
+    - if comment.parent
+      li= link_to 'parent', subcreddit_post_comment_path(subcreddit, post, comment.parent)
+    li= link_to 'edit', edit_subcreddit_post_comment_path(subcreddit, post, comment)
+    li= link_to 'delete', subcreddit_post_comment_path(subcreddit, post, comment), method: :delete
+    li= link_to 'spam', ''
+    li= link_to 'remove', ''
+    li= link_to 'give gold', ''

app/views/comments/_form.html.slim

@@ -0,0 +1,7 @@
+= simple_form_for [subcreddit, post, comment] do |f|
+  - if local_assigns.has_key?(:parent) && parent
+    = f.hidden_field :parent_id, value: parent.id
+  .form-inputs
+    = f.input :content, label: false
+  .form-actions
+    = f.button :submit

app/views/comments/edit.html.slim

@@ -0,0 +1,2 @@
+h1 Edit comment
+== render 'form', subcreddit: @subcreddit, post: @post, comment: @comment

app/views/comments/show.html.slim

@@ -0,0 +1,8 @@
+== render 'posts/post', post: @post
+.alert.alert-info.in-page
+  p you are viewing a single comment's thread.
+  p #{link_to 'view the rest of the comments', subcreddit_post_path(@subcreddit, @post)} →
+= "Commenting as: #{current_user.username}"
+== render 'comments/form', subcreddit: @subcreddit, post: @post, comment: @post.comments.build, parent: @comment
+.comments.contents
+  == nested_comments(@comments)

app/views/layouts/application.html.slim

@@ -7,7 +7,7 @@ html
     = csrf_meta_tags
   body
     == render 'navbar'
-    .container
+    .container-fluid
       == render 'flash_messages'
     .main.container-fluid
       .col-md-3.pull-right

app/views/posts/_post.html.slim

@@ -0,0 +1,14 @@
+.posts.contents
+  .post.show
+    p.title= link_to post.title, [post.subcreddit, post]
+    p.details= "submitted #{distance_of_time_in_words post.created_at, Time.now} ago by #{post.user_username}"
+    p.content= post.content
+    ul.links.list-inline
+      li= link_to "#{post.comments_count} comments", subcreddit_post_path(post.subcreddit, post)
+      li= link_to 'share', ''
+      li= link_to 'edit', edit_subcreddit_post_path(post.subcreddit, post)
+      li= link_to 'save', ''
+      li= link_to 'hide', ''
+      li= link_to 'remove', ''
+      li= link_to 'approve', ''
+      li= link_to 'nsfw', ''

app/views/posts/show.html.slim

@@ -1,18 +1,9 @@
-.posts
-  .post.show
-    p.title= link_to @post.title, [@subcreddit, @post]
-    p.details= "submitted #{distance_of_time_in_words @post.created_at, Time.now} ago by #{@post.user_username}"
-    ul.links.list-inline
-      li= link_to 'XXX comments', ''
-      li= link_to 'source', ''
-      li= link_to 'share', ''
-      li= link_to 'save', ''
-      li= link_to 'hide', ''
-      li= link_to 'give gold', ''
-      li= link_to 'spam', ''
-      li= link_to 'remove', ''
-      li= link_to 'approve', ''
-      li= link_to 'report', ''
-      li= link_to 'nsfw', ''
-      li= link_to 'hide all child comments', ''
-    p.content= @post.content
+== render 'post', post: @post
+- if @post.comments?
+  .title= "all #{@post.comments_count} comments"
+- else
+  .title= "no comments (yet)"
+= "Commenting as: #{current_user.username}"
+== render 'comments/form', subcreddit: @subcreddit, post: @post, comment: @post.comments.build, parent: nil
+.comments.contents
+  == nested_comments(@comments)

app/views/subcreddits/show.html.slim

@@ -1,13 +1,13 @@
 - if @subcreddit.closed?
   = "Board has been closed"
 - else
-  .posts
+  .posts.contents
     ul
       - @subcreddit.posts.order('created_at DESC').each_with_index do |post, rank|
         li
           .post
-            p.title= link_to post.title, [@subcreddit, post]
+            p.title= link_to post.title, subcreddit_post_path(@subcreddit, post)
             p.details= "submitted #{distance_of_time_in_words post.created_at, Time.now} ago by #{post.user_username}"
             ul.links.list-inline
-              li= link_to 'XXX comments', ''
+              li= link_to "#{post.comments_count} comments", subcreddit_post_path(@subcreddit, post)
               li= link_to 'share', ''

config/environments/development.rb

@@ -38,4 +38,11 @@ Rails.application.configure do
 
   # Raises error for missing translations
   # config.action_view.raise_on_missing_translations = true
+
+  # Bullet
+  config.after_initialize do
+    Bullet.enable = true
+    Bullet.bullet_logger = true
+    Bullet.add_footer = true
+  end
 end

config/routes.rb

@@ -4,7 +4,9 @@ Rails.application.routes.draw do
   get 'signout', to: 'user_sessions#destroy', as: :signout
 
   resources :subcreddits, path: 'c', except: [:destroy] do
-    resources :posts, except: [:index]
+    resources :posts, path: '', constraints: { id: /\d+\-.+/ }, except: [:index] do
+      resources :comments, path: '', constraints: { id: /\d+/ }, except: [:index]
+    end
   end
 
   resources :user_sessions, only: [:new, :create, :destroy]

db/migrate/20150716155403_create_comments.rb

@@ -0,0 +1,14 @@
+class CreateComments < ActiveRecord::Migration
+  def change
+    create_table :comments do |t|
+      t.references :user, index: true, foreign_key: true
+      t.references :post, index: true, foreign_key: true
+      t.string :ancestry
+      t.text :content
+
+      t.timestamps null: false
+    end
+
+    add_index :comments, :ancestry
+  end
+end

db/migrate/20150804000313_add_comments_count_to_post.rb

@@ -0,0 +1,10 @@
+class AddCommentsCountToPost < ActiveRecord::Migration
+  def change
+    add_column :posts, :comments_count, :integer, default: 0
+
+    Post.reset_column_information
+    Post.all.each do |p|
+      p.update_attribute :comments_count, p.comments.length
+    end
+  end
+end

db/migrate/20150804145405_add_deleted_at_to_comments.rb

@@ -0,0 +1,5 @@
+class AddDeletedAtToComments < ActiveRecord::Migration
+  def change
+    add_column :comments, :deleted_at, :datetime
+  end
+end

db/schema.rb

@@ -11,7 +11,21 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20150716050055) do
+ActiveRecord::Schema.define(version: 20150804145405) do
+
+  create_table "comments", force: :cascade do |t|
+    t.integer  "user_id"
+    t.integer  "post_id"
+    t.string   "ancestry"
+    t.text     "content"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.datetime "deleted_at"
+  end
+
+  add_index "comments", ["ancestry"], name: "index_comments_on_ancestry"
+  add_index "comments", ["post_id"], name: "index_comments_on_post_id"
+  add_index "comments", ["user_id"], name: "index_comments_on_user_id"
 
   create_table "friendly_id_slugs", force: :cascade do |t|
     t.string   "slug",                      null: false
@@ -32,8 +46,9 @@ ActiveRecord::Schema.define(version: 20150716050055) do
     t.string   "title"
     t.string   "link"
     t.text     "content"
-    t.datetime "created_at",    null: false
-    t.datetime "updated_at",    null: false
+    t.datetime "created_at",                 null: false
+    t.datetime "updated_at",                 null: false
+    t.integer  "comments_count", default: 0
   end
 
   add_index "posts", ["subcreddit_id"], name: "index_posts_on_subcreddit_id"

spec/controllers/comments_controller_spec.rb

@@ -0,0 +1,201 @@
+require 'rails_helper'
+
+describe CommentsController, type: :controller do
+  let!(:user) { build(:user) }
+  let!(:subcreddit) { create(:subcreddit) }
+  let!(:tpost) { create(:post, subcreddit: subcreddit) }
+  let(:data) { { content: 'Here is some updated content for a comment' } }
+
+  before(:each) do
+    allow_any_instance_of(ApplicationController)
+      .to receive(:current_user).and_return(user)
+  end
+
+  describe '#show' do
+    let!(:comment) { create(:comment) }
+    before(:each) do
+      get :show,
+        subcreddit_id: comment.post.subcreddit,
+        post_id: comment.post,
+        id: comment
+    end
+
+    it 'should render :show' do
+      expect(response).to render_template(:show)
+    end
+
+    it 'should assign correct Comment to @comment' do
+      expect(assigns(:comment)).to eq(comment)
+    end
+  end
+
+  describe '#new' do
+    let(:comment) { build(:comment) }
+    before(:each) do
+      get :new,
+        subcreddit_id: comment.post.subcreddit,
+        post_id: comment.post
+    end
+
+    it 'should render :new' do
+      expect(response).to render_template(:new)
+    end
+
+    it 'should assign new Comment to @comment' do
+      expect(assigns(:comment)).to be_a_new(Comment)
+    end
+  end
+
+  describe '#create' do
+    context 'with valid data' do
+      it 'should create a comment' do
+        expect do
+          post :create,
+            subcreddit_id: subcreddit,
+            post_id: tpost,
+            comment: data
+        end.to change(Comment, :count).by(1)
+      end
+
+      it 'should redirect to the parent post' do
+        expect(post :create,
+                subcreddit_id: subcreddit,
+                post_id: tpost,
+                comment: data
+          ).to redirect_to(subcreddit_post_path(assigns(:post).subcreddit,
+                                                assigns(:post)))
+      end
+
+      it 'should send a notice flash message' do
+        expect(post :create,
+                subcreddit_id: subcreddit,
+                post_id: tpost,
+                comment: data)
+
+        expect(flash[:notice]).to be_present
+      end
+    end
+
+    context 'with invalid data' do
+      before(:each) { data['content'] = '' }
+
+      it 'should not create a new comment' do
+        expect do
+          post :create,
+            subcreddit_id: subcreddit,
+            post_id: tpost,
+            comment: data
+        end.to change(Comment, :count).by(0)
+      end
+
+      it 'should render :new' do
+        expect(post :create,
+                subcreddit_id: subcreddit,
+                post_id: tpost,
+                comment: data
+        ).to redirect_to(subcreddit_post_path(subcreddit, tpost))
+      end
+    end
+  end
+
+  describe '#edit' do
+    let!(:comment) { create(:comment) }
+    before(:each) do
+      get :edit,
+        id: comment,
+        post_id: comment.post,
+        subcreddit_id: comment.post.subcreddit
+    end
+
+    context 'with valid comment' do
+      it 'should render :edit' do
+        expect(response).to render_template(:edit)
+      end
+
+      it 'should assign correct Comment to @comment' do
+        expect(assigns(:comment)).to eq(comment)
+      end
+    end
+  end
+
+  context '#update' do
+    let!(:comment) { create(:comment) }
+    let(:data) { { content: 'Some edited comment content goes here' } }
+
+    context 'with valid data' do
+      before(:each) do
+        put :update,
+          id: comment,
+          post_id: comment.post,
+          subcreddit_id: comment.post.subcreddit,
+          comment: data
+      end
+
+      it 'should assign correct Comment to @comment' do
+        expect(assigns(:comment)).to eq(comment)
+      end
+
+      it 'should update the comment' do
+        comment.reload
+
+        expect(comment.content).to eq(data[:content])
+      end
+
+      it 'should redirect to the post' do
+        expect(response)
+          .to redirect_to(subcreddit_post_path(assigns(:post).subcreddit,
+                                               assigns(:post)))
+      end
+
+      it 'should display a notice flash message' do
+        expect(flash[:notice]).to be_present
+      end
+    end
+
+    context 'with invalid data' do
+      before(:each) { data[:content] = '' }
+
+      it 'should render :edit' do
+        put :update,
+          id: comment,
+          post_id: comment.post,
+          subcreddit_id: comment.post.subcreddit,
+          comment: data
+
+        expect(response).to render_template(:edit)
+      end
+    end
+  end
+
+  context '#destroy' do
+    let!(:comment) { create(:comment) }
+
+    it 'should delete the post' do
+      delete :destroy,
+        id: comment,
+        post_id: comment.post,
+        subcreddit_id: comment.post.subcreddit
+
+      comment.reload
+      expect(comment.destroyed?).to be(true)
+    end
+
+    it 'should redirect to the post' do
+      delete :destroy,
+        id: comment,
+        post_id: comment.post,
+        subcreddit_id: comment.post.subcreddit
+
+      expect(response).to redirect_to(subcreddit_post_path(assigns(:subcreddit),
+                                                           assigns(:post)))
+    end
+
+    it 'should send a notice flash message' do
+      delete :destroy,
+        id: comment,
+        post_id: comment.post,
+        subcreddit_id: comment.post.subcreddit
+      expect(flash[:notice]).to be_present
+    end
+  end
+end

spec/factories/comment_factory.rb

@@ -0,0 +1,7 @@
+FactoryGirl.define do
+  factory :comment do
+    user
+    post
+    content { Faker::Lorem.paragraph }
+  end
+end

spec/factories/user_factory.rb

@@ -1,6 +1,6 @@
 FactoryGirl.define do
   factory :user do
-    username { Faker::Internet.user_name }
+    sequence(:username) { |n| Faker::Internet.user_name + "#{n}" }
     password { Faker::Internet.password(8, 50) }
     email { Faker::Internet.email }
   end

spec/features/comments/edit_comment_spec.rb

@@ -0,0 +1,30 @@
+require 'rails_helper'
+
+describe 'Edit Comment', type: :feature do
+  let!(:user) { create(:user) }
+  let!(:post) { create(:post) }
+  let!(:comment) { create(:comment, post: post, user: user) }
+
+  context 'when signed in' do
+    let(:content) { 'Some different data' }
+    before(:each) { signin(user: user) }
+
+    context 'with valid data' do
+      before(:each) do
+        visit edit_subcreddit_post_comment_path(post.subcreddit, post, comment)
+
+        fill_in :comment_content, with: content
+
+        click_button 'Update Comment'
+      end
+
+      it 'should notify that the comment was edited' do
+        expect(page).to have_content('updated')
+      end
+
+      it 'should update the comment' do
+        expect(page).to have_content(content)
+      end
+    end
+  end
+end

spec/features/comments/new_comment_spec.rb

@@ -0,0 +1,57 @@
+require 'rails_helper'
+
+describe 'New Comment', type: :feature do
+  let!(:post) { create(:post) }
+  let(:comment) { build(:comment) }
+
+  context 'when signed in' do
+    let(:user) { create(:user) }
+
+    before(:each) { signin(user: user) }
+
+    context 'with valid data' do
+      before(:each) do
+        visit subcreddit_post_path(post.subcreddit, post)
+
+        fill_in :comment_content, with: comment.content
+
+        click_button 'Create Comment'
+      end
+
+      it 'should notify that a new content was created' do
+        expect(page).to have_content('saved')
+      end
+
+      it 'should display the new comment' do
+        expect(page).to have_content(comment.content)
+      end
+
+      context 'when nesting comment' do
+        let!(:comment) { create(:comment, post: post) }
+
+        it 'should display a nested comment' do
+          visit subcreddit_post_comment_path(post.subcreddit, post, comment)
+
+          fill_in :comment_content, with: comment.content
+          click_button 'Create Comment'
+
+          expect(page).to have_css('div.nested_comments')
+        end
+      end
+    end
+
+    context 'with invalid data' do
+      before(:each) do
+        visit subcreddit_post_path(post.subcreddit, post)
+
+        fill_in :comment_content, with: ''
+
+        click_button 'Create Comment'
+      end
+
+      it 'should display errors' do
+        expect(page).to have_content('could not')
+      end
+    end
+  end
+end

spec/features/posts/edit_post_spec.rb

@@ -24,8 +24,9 @@ describe 'Edit Post', type: :feature do
         expect(page).to have_content('updated')
       end
 
-      it 'should show the post' do
+      it 'should show the updated post' do
         expect(page).to have_content(new_post.title)
+        expect(page).to have_content(new_post.content)
       end
     end
   end

spec/features/posts/lists_posts_spec.rb

@@ -9,7 +9,7 @@ describe 'List Posts', type: :feature do
 
     posts.each do |post|
       expect(page)
-        .to have_link(post.title, subcreddit_post_path(post, post.subcreddit))
+        .to have_link(post.title, subcreddit_post_path(post.subcreddit, post))
     end
   end
 end

spec/helpers/comments_helper_spec.rb

@@ -0,0 +1,7 @@
+require 'rails_helper'
+
+describe CommentsHelper do
+  describe '#nested_comments' do
+    it 'renders the comment partial'
+  end
+end

spec/models/comment_spec.rb

@@ -0,0 +1,63 @@
+require 'rails_helper'
+
+describe Comment, type: :model do
+  let(:comment) { build(:comment) }
+
+  it { should belong_to(:user) }
+  it { should belong_to(:post).counter_cache(true) }
+
+  it { should delegate_method(:username).to(:user).with_prefix }
+
+  context 'with valid data' do
+    it 'should be valid' do
+      expect(comment).to be_valid
+    end
+  end
+
+  context 'with invalid data' do
+    it 'should not be valid with blank content' do
+      comment.content = ''
+
+      expect(comment).to be_invalid
+    end
+  end
+
+  context 'when comment is deleted' do
+    before(:each) { comment.deleted_at = Time.now }
+
+    context '#destroyed?' do
+      it 'should respond with true' do
+        expect(comment.destroyed?).to be(true)
+      end
+    end
+
+    context '#content' do
+      it 'should return [deleted]' do
+        expect(comment.content).to eq('[deleted]')
+      end
+    end
+  end
+
+  context 'when comment is not deleted' do
+    context '#destroyed?' do
+      it 'should respond with false' do
+        expect(comment.destroyed?).to be(false)
+      end
+    end
+
+    context '#content' do
+      it 'should return comment content' do
+        expect(comment.content).to eq(comment.content)
+      end
+    end
+  end
+
+  context '#destroy' do
+    it 'should set the deleted_at time appropriately' do
+      Timecop.freeze do
+        comment.destroy
+        expect(comment.deleted_at).to eq(Time.now)
+      end
+    end
+  end
+end

spec/models/post_spec.rb

@@ -5,9 +5,20 @@ describe Post, type: :model do
 
   it { should belong_to(:user) }
   it { should belong_to(:subcreddit) }
+  it { should have_many(:comments) }
 
   it { should delegate_method(:username).to(:user).with_prefix }
 
+  context 'when adding a comment' do
+    let(:post) { create(:post) }
+
+    it 'should update the cache_counter for comments' do
+      expect do
+        create(:comment, post: post)
+      end.to change { post.comments_count }.by(1)
+    end
+  end
+
   context 'with valid data' do
     it 'should be valid' do
       expect(post).to be_valid
@@ -53,4 +64,24 @@ describe Post, type: :model do
       expect(post.to_param).to eq("#{post.id}-#{post.title.parameterize}")
     end
   end
+
+  context '#comments?' do
+    let(:post) { create(:post) }
+
+    context 'with comments' do
+      before(:each) do
+        create(:comment, post: post)
+      end
+
+      it 'should respond with true' do
+        expect(post.comments?).to be(true)
+      end
+    end
+
+    context 'without comments' do
+      it 'should respond with false' do
+        expect(post.comments?).to be(false)
+      end
+    end
+  end
 end