Add categories model and tests.

.rake_tasks~

@@ -0,0 +1,40 @@
+about
+app:template
+app:update
+assets:clean[keep]
+assets:clobber
+assets:environment
+assets:precompile
+cache_digests:dependencies
+cache_digests:nested_dependencies
+db:create
+db:drop
+db:environment:set
+db:fixtures:load
+db:migrate
+db:migrate:status
+db:rollback
+db:schema:cache:clear
+db:schema:cache:dump
+db:schema:dump
+db:schema:load
+db:seed
+db:setup
+db:structure:dump
+db:structure:load
+db:version
+dev:cache
+initializers
+log:clear
+middleware
+notes
+notes:custom
+restart
+routes
+secret
+stats
+test
+test:db
+time:zones[country_or_offset]
+tmp:clear
+tmp:create

Gemfile

@@ -16,6 +16,7 @@ gem 'bootstrap-sass', '~> 3.3.6'
 gem 'bcrypt', '~> 3.1.7'
 gem 'will_paginate', '~> 3.0.7'
 gem 'bootstrap-will_paginate', '~> 0.0.10'
+gem 'rails-controller-testing'
 gem 'sass-rails', '~> 5.0'
 # Use Uglifier as compressor for JavaScript assets
 gem 'uglifier', '>= 1.3.0'

Gemfile.lock

@@ -105,6 +105,10 @@ GEM
       bundler (>= 1.3.0, < 2.0)
       railties (= 5.0.1)
       sprockets-rails (>= 2.0.0)
+    rails-controller-testing (1.0.1)
+      actionpack (~> 5.x)
+      actionview (~> 5.x)
+      activesupport (~> 5.x)
     rails-dom-testing (2.0.2)
       activesupport (>= 4.2.0, < 6.0)
       nokogiri (~> 1.6)
@@ -180,6 +184,7 @@ DEPENDENCIES
   pg
   puma (~> 3.0)
   rails (~> 5.0.1)
+  rails-controller-testing
   rails_12factor
   sass-rails (~> 5.0)
   spring

app/controllers/categories_controller.rb

@@ -0,0 +1,27 @@
+class CategoriesController < ApplicationController
+  def index
+    @categories = Category.paginate(page: params[:page], per_page: 5)
+  end
+
+  def new
+    @category = Category.new
+  end
+
+  def create
+    @category = Category.new(category_params)
+    if @category.save
+      flash[:success] = "Category created successfully."
+      redirect_to categories_path
+    else
+      render 'new'
+    end
+  end
+
+  def show
+  end
+
+  private
+  def category_params
+    params.require(:category).permit(:name)
+  end
+end

app/models/category.rb

@@ -0,0 +1,4 @@
+class Category < ActiveRecord::Base
+  validates :name, presence: true, length: { minimum: 3, maximum: 25 }
+  validates_uniqueness_of :name
+end

app/views/categories/_form.html.erb

@@ -0,0 +1,18 @@
+<%= render 'shared/errors', obj: @category %>
+
+<%= form_for(@category, :html => {class: "form-horizontal", role: 'form'}) do |f| %>
+  <div class="form-group">
+    <div class="control-label col-sm-2">
+      <%= f.label :category %>
+    </div>
+    <div class="col-sm-8">
+      <%= f.text_field :name, class: "form-control", placeholder: "Enter category name", autofocus: true %>
+    </div>
+  </div>
+  <div class="form-group">
+    <div class="col-sm-offset-2 col-sm-10">
+      <%= f.submit "Create", class: 'btn btn-primary  home-btn' %>
+      <%= link_to "Back to Articles List", articles_path, class: 'btn btn-secondary cancel-btn' %>
+    </div>
+  </div>
+<% end %>

app/views/categories/index.html.erb

@@ -0,0 +1,16 @@
+<h1 align="center"> Listing all categories</h1>
+
+<div align="center">
+  <% @categories.each do |category| %>
+    <ul class="listing">
+      <div class="row">
+        <div class="well col-md-4 col-md-offset-4">
+          <li class="article-title">
+            <%= link_to "#{category.name}", category_path(category) %>
+          </li>
+        </div>
+      </div>
+    </ul>
+  <% end %>
+  <%= will_paginate %>
+</div>

app/views/categories/new.html.erb

@@ -0,0 +1,3 @@
+<h1 align="center">Create Category</h1>
+
+<%= render 'form' %>

config/routes.rb

@@ -2,10 +2,15 @@
   # For details on the DSL available within this file, see http://guides.rubyonrails.org/routing.html
   root 'pages#home'
   get 'about', to: 'pages#about'
+
+  resources :articles
+
   get 'signup', to: 'users#new'
+  resources :users, except: [:new]
+
   get 'login', to: 'sessions#new'
   post 'login', to: 'sessions#create'
   delete 'logout', to: 'sessions#destroy'
-  resources :users, except: [:new]
-  resources :articles
+
+  resources :categories, except: [:destroy]
 end

db/migrate/20170228143327_create_category.rb

@@ -0,0 +1,8 @@
+class CreateCategory < ActiveRecord::Migration[5.0]
+  def change
+    create_table :categories do |t|
+      t.string :name
+      t.timestamps
+    end
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20170228021927) do
+ActiveRecord::Schema.define(version: 20170228143327) do
 
   create_table "articles", force: :cascade do |t|
     t.string   "title"
@@ -20,6 +20,12 @@
     t.integer  "user_id"
   end
 
+  create_table "categories", force: :cascade do |t|
+    t.string   "name"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+  end
+
   create_table "users", force: :cascade do |t|
     t.string   "username"
     t.string   "email"

test/controllers/categories_controller_test.rb

@@ -0,0 +1,23 @@
+require 'test_helper'
+
+class CategoriesControllerTest < ActionController::TestCase
+
+  def setup
+    @category = Category.create(name: "sports")
+  end
+
+  test 'should get category index' do
+    get :index
+    assert_response :success
+  end
+
+  test 'should get category new' do
+    get :new
+    assert_response :success
+  end
+
+  test 'should get category show' do
+    get :show, params: { id: @category.id }
+    assert_response :success
+  end
+end

test/integration/create_categories_test.rb

@@ -0,0 +1,26 @@
+require 'test_helper'
+
+class CreateCategoriesTest < ActionDispatch::IntegrationTest
+  test "get new category test and create category" do
+    get new_category_path
+    assert_template 'categories/new'
+    assert_difference 'Category.count', 1 do
+      #post_via_redirect categories_path, params: { category: { name: "sports" } }
+      post categories_path, params: { category: { name: "sports" } }
+      follow_redirect!
+    end
+    assert_template 'categories/index'
+    assert_match "sports", response.body
+  end
+
+  test "invalid category submission results in failure" do
+    get new_category_path
+    assert_template 'categories/new'
+    assert_no_difference 'Category.count' do
+      post categories_path, params: { category: { name: "" } }
+    end
+    assert_template 'categories/new'
+    assert_select 'h2.panel-title'
+    assert_select 'div.panel-body'
+  end
+end

test/integration/list_categories_test.rb

@@ -0,0 +1,16 @@
+require 'test_helper'
+
+class ListCategoriesTest < ActionDispatch::IntegrationTest
+
+  def setup
+    @category = Category.create(name: "sports")
+    @category2 = Category.create(name: "programming")
+  end
+
+  test "should show categories listing" do
+    get categories_path
+    assert_template 'categories/index'
+    assert_select 'a[href=?]', category_path(@category), text: @category.name
+    assert_select 'a[href=?]', category_path(@category2), text: @category2.name
+  end
+end

test/models/category_test.rb

@@ -0,0 +1,34 @@
+require 'test_helper'
+
+class CategoryTest < ActiveSupport::TestCase
+
+  def setup
+    @category = Category.new(name: "sports")
+  end
+
+  test "category should be valid" do
+    assert @category.valid?
+  end
+
+  test 'category name should be present' do
+    @category.name = ""
+    assert_not @category.valid?
+  end
+
+  test 'category name should be unique' do
+    @category.save
+    category2 = Category.new(name: "sports")
+
+    assert_not category2.valid?
+  end
+
+  test 'category name should be too long' do
+    @category.name = "a" * 26
+    assert_not @category.valid?
+  end
+
+  test 'category name should be too short' do
+    @category.name = "aa"
+    assert_not @category.valid?
+  end
+end