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.gitignore

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+# See https://help.github.com/articles/ignoring-files for more about ignoring files.
+#
+# If you find yourself ignoring temporary files generated by your text editor
+# or operating system, you probably want to add a global ignore instead:
+#   git config --global core.excludesfile '~/.gitignore_global'
+
+# Ignore bundler config.
+/.bundle
+
+# Ignore all logfiles and tempfiles.
+/log/*
+/tmp/*
+!/log/.keep
+!/tmp/.keep
+
+# Ignore pidfiles, but keep the directory.
+/tmp/pids/*
+!/tmp/pids/
+!/tmp/pids/.keep
+
+# Ignore uploaded files in development.
+/storage/*
+!/storage/.keep
+.byebug_history
+
+# Ignore master key for decrypting credentials and more.
+/config/master.key

.ruby-version

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+ruby-2.6.1

Gemfile

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+source 'https://rubygems.org'
+git_source(:github) { |repo| "https://github.com/#{repo}.git" }
+
+ruby '2.6.1'
+
+# Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
+gem 'rails', '~> 6.0.3', '>= 6.0.3.5'
+# Use postgresql as the database for Active Record
+gem 'pg', '>= 0.18', '< 2.0'
+# Use Puma as the app server
+gem 'puma', '~> 4.1'
+
+
+# Build JSON APIs with ease. Read more: https://github.com/rails/jbuilder
+# gem 'jbuilder', '~> 2.7'
+# Use Redis adapter to run Action Cable in production
+# gem 'redis', '~> 4.0'
+# Use Active Model has_secure_password
+# gem 'bcrypt', '~> 3.1.7'
+
+# Use Active Storage variant
+# gem 'image_processing', '~> 1.2'
+
+# Reduces boot times through caching; required in config/boot.rb
+gem 'bootsnap', '>= 1.4.2', require: false
+
+# Use Rack CORS for handling Cross-Origin Resource Sharing (CORS), making cross-origin AJAX possible
+# gem 'rack-cors'
+
+group :development, :test do
+  # Call 'byebug' anywhere in the code to stop execution and get a debugger console
+  gem 'byebug', platforms: %i[mri mingw x64_mingw]
+end
+
+group :development do
+  gem 'rubocop', require: false
+  gem 'listen', '~> 3.2'
+  # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
+  gem 'spring'
+  gem 'spring-watcher-listen', '~> 2.0.0'
+end
+
+# Windows does not include zoneinfo files, so bundle the tzinfo-data gem
+gem 'tzinfo-data', platforms: %i[mingw mswin x64_mingw jruby]

Gemfile.lock

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+GEM
+  remote: https://rubygems.org/
+  specs:
+    actioncable (6.0.3.5)
+      actionpack (= 6.0.3.5)
+      nio4r (~> 2.0)
+      websocket-driver (>= 0.6.1)
+    actionmailbox (6.0.3.5)
+      actionpack (= 6.0.3.5)
+      activejob (= 6.0.3.5)
+      activerecord (= 6.0.3.5)
+      activestorage (= 6.0.3.5)
+      activesupport (= 6.0.3.5)
+      mail (>= 2.7.1)
+    actionmailer (6.0.3.5)
+      actionpack (= 6.0.3.5)
+      actionview (= 6.0.3.5)
+      activejob (= 6.0.3.5)
+      mail (~> 2.5, >= 2.5.4)
+      rails-dom-testing (~> 2.0)
+    actionpack (6.0.3.5)
+      actionview (= 6.0.3.5)
+      activesupport (= 6.0.3.5)
+      rack (~> 2.0, >= 2.0.8)
+      rack-test (>= 0.6.3)
+      rails-dom-testing (~> 2.0)
+      rails-html-sanitizer (~> 1.0, >= 1.2.0)
+    actiontext (6.0.3.5)
+      actionpack (= 6.0.3.5)
+      activerecord (= 6.0.3.5)
+      activestorage (= 6.0.3.5)
+      activesupport (= 6.0.3.5)
+      nokogiri (>= 1.8.5)
+    actionview (6.0.3.5)
+      activesupport (= 6.0.3.5)
+      builder (~> 3.1)
+      erubi (~> 1.4)
+      rails-dom-testing (~> 2.0)
+      rails-html-sanitizer (~> 1.1, >= 1.2.0)
+    activejob (6.0.3.5)
+      activesupport (= 6.0.3.5)
+      globalid (>= 0.3.6)
+    activemodel (6.0.3.5)
+      activesupport (= 6.0.3.5)
+    activerecord (6.0.3.5)
+      activemodel (= 6.0.3.5)
+      activesupport (= 6.0.3.5)
+    activestorage (6.0.3.5)
+      actionpack (= 6.0.3.5)
+      activejob (= 6.0.3.5)
+      activerecord (= 6.0.3.5)
+      marcel (~> 0.3.1)
+    activesupport (6.0.3.5)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 0.7, < 2)
+      minitest (~> 5.1)
+      tzinfo (~> 1.1)
+      zeitwerk (~> 2.2, >= 2.2.2)
+    ast (2.4.2)
+    bootsnap (1.7.2)
+      msgpack (~> 1.0)
+    builder (3.2.4)
+    byebug (11.1.3)
+    concurrent-ruby (1.1.8)
+    crass (1.0.6)
+    erubi (1.10.0)
+    ffi (1.14.2)
+    globalid (0.4.2)
+      activesupport (>= 4.2.0)
+    i18n (1.8.9)
+      concurrent-ruby (~> 1.0)
+    listen (3.4.1)
+      rb-fsevent (~> 0.10, >= 0.10.3)
+      rb-inotify (~> 0.9, >= 0.9.10)
+    loofah (2.9.0)
+      crass (~> 1.0.2)
+      nokogiri (>= 1.5.9)
+    mail (2.7.1)
+      mini_mime (>= 0.1.1)
+    marcel (0.3.3)
+      mimemagic (~> 0.3.2)
+    method_source (1.0.0)
+    mimemagic (0.3.5)
+    mini_mime (1.0.2)
+    mini_portile2 (2.5.0)
+    minitest (5.14.4)
+    msgpack (1.4.2)
+    nio4r (2.5.7)
+    nokogiri (1.11.1)
+      mini_portile2 (~> 2.5.0)
+      racc (~> 1.4)
+    parallel (1.17.0)
+    parser (3.0.0.0)
+      ast (~> 2.4.1)
+    pg (1.2.3)
+    puma (4.3.7)
+      nio4r (~> 2.0)
+    racc (1.5.2)
+    rack (2.2.3)
+    rack-test (1.1.0)
+      rack (>= 1.0, < 3)
+    rails (6.0.3.5)
+      actioncable (= 6.0.3.5)
+      actionmailbox (= 6.0.3.5)
+      actionmailer (= 6.0.3.5)
+      actionpack (= 6.0.3.5)
+      actiontext (= 6.0.3.5)
+      actionview (= 6.0.3.5)
+      activejob (= 6.0.3.5)
+      activemodel (= 6.0.3.5)
+      activerecord (= 6.0.3.5)
+      activestorage (= 6.0.3.5)
+      activesupport (= 6.0.3.5)
+      bundler (>= 1.3.0)
+      railties (= 6.0.3.5)
+      sprockets-rails (>= 2.0.0)
+    rails-dom-testing (2.0.3)
+      activesupport (>= 4.2.0)
+      nokogiri (>= 1.6)
+    rails-html-sanitizer (1.3.0)
+      loofah (~> 2.3)
+    railties (6.0.3.5)
+      actionpack (= 6.0.3.5)
+      activesupport (= 6.0.3.5)
+      method_source
+      rake (>= 0.8.7)
+      thor (>= 0.20.3, < 2.0)
+    rainbow (3.0.0)
+    rake (13.0.3)
+    rb-fsevent (0.10.4)
+    rb-inotify (0.10.1)
+      ffi (~> 1.0)
+    regexp_parser (2.1.1)
+    rexml (3.1.9)
+    rubocop (1.11.0)
+      parallel (~> 1.10)
+      parser (>= 3.0.0.0)
+      rainbow (>= 2.2.2, < 4.0)
+      regexp_parser (>= 1.8, < 3.0)
+      rexml
+      rubocop-ast (>= 1.2.0, < 2.0)
+      ruby-progressbar (~> 1.7)
+      unicode-display_width (>= 1.4.0, < 3.0)
+    rubocop-ast (1.4.1)
+      parser (>= 2.7.1.5)
+    ruby-progressbar (1.10.1)
+    spring (2.1.1)
+    spring-watcher-listen (2.0.1)
+      listen (>= 2.7, < 4.0)
+      spring (>= 1.2, < 3.0)
+    sprockets (4.0.2)
+      concurrent-ruby (~> 1.0)
+      rack (> 1, < 3)
+    sprockets-rails (3.2.2)
+      actionpack (>= 4.0)
+      activesupport (>= 4.0)
+      sprockets (>= 3.0.0)
+    thor (1.1.0)
+    thread_safe (0.3.6)
+    tzinfo (1.2.9)
+      thread_safe (~> 0.1)
+    unicode-display_width (1.6.0)
+    websocket-driver (0.7.3)
+      websocket-extensions (>= 0.1.0)
+    websocket-extensions (0.1.5)
+    zeitwerk (2.4.2)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  bootsnap (>= 1.4.2)
+  byebug
+  listen (~> 3.2)
+  pg (>= 0.18, < 2.0)
+  puma (~> 4.1)
+  rails (~> 6.0.3, >= 6.0.3.5)
+  rubocop
+  spring
+  spring-watcher-listen (~> 2.0.0)
+  tzinfo-data
+
+RUBY VERSION
+   ruby 2.6.1p33
+
+BUNDLED WITH
+   2.1.4

Rakefile

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+# Add your own tasks in files placed in lib/tasks ending in .rake,
+# for example lib/tasks/capistrano.rake, and they will automatically be available to Rake.
+
+require_relative 'config/application'
+
+Rails.application.load_tasks

app/channels/application_cable/channel.rb

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+module ApplicationCable
+  class Channel < ActionCable::Channel::Base
+  end
+end

app/channels/application_cable/connection.rb

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+module ApplicationCable
+  class Connection < ActionCable::Connection::Base
+  end
+end

app/controllers/api/v1/api_controller.rb

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+module Api::V1
+  class ApiController < ApplicationController
+
+  end
+end

app/controllers/api/v1/categories_controller.rb

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+class Api::V1::CategoriesController < Api::V1::ApiController
+
+  def index
+        @categories = Category.all.sorted_by_desc
+
+        render json: @categories
+      end
+
+      def show
+        category = Category.find(params[:id])
+        render json: { data: category }, status: :ok
+      end
+
+      def create
+        category = Category.new(category_params)
+        if category.save
+          render json: category , status: :created
+        else
+          render json: category.errors, status: :unprocessable_entity
+        end
+      end
+
+      def update
+        category = Category.find(params[:id])
+        if category.update_attributes(category_params)
+          render json: category, status: :ok
+        else
+          render json: category.errors, status: :unprocessable_entity
+        end
+      end
+
+      def destroy
+        category = Category.find(params[:id])
+        if category.destroy
+          head :ok
+        else
+          render json: category.errors, status: :unprocessable_entity
+        end
+      end
+
+      private
+
+      def category_params
+        params.permit(:name)
+      end
+    end

app/controllers/api/v1/posts_controller.rb

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+class Api::V1::PostsController < Api::V1::ApiController
+
+  before_action :set_post, only: %i[show update destroy]
+
+  def index
+    @posts = Post.filter(filtering_params).sorted_by_desc
+    render json: @posts
+
+  end
+
+  def show
+    post = Post.find(params[:id])
+    render json: post, status: :ok
+  end
+
+  def create
+    post = Post.new(post_params)
+    if post.save
+      render json: post , status: :created
+    else
+      render json: post.errors , status: :unprocessable_entity
+    end
+  end
+
+  def update
+    post = Post.find(params[:id])
+    if post.update_attributes(post_params)
+      render json: post , status: :ok
+    else
+      render json: post.errors , status: :unprocessable_entity
+    end
+  end
+
+  def destroy
+    post = Post.find(params[:id])
+    if post.destroy
+      head :ok
+    else
+      render json: post.errors, status: :unprocessable_entity
+    end
+  end
+
+  private
+
+  def set_post
+    post = Post.find(params[:id])
+  end
+
+  def filtering_params
+    params.slice(:category_name, :category_id, :posted_after, :posted_before)
+  end
+
+  def post_params
+    params.permit(:title, :body, :posted_at, :category_id)
+  end
+end

app/controllers/application_controller.rb

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+class ApplicationController < ActionController::API
+end