add post

app/controllers/posts_controller.rb

@@ -0,0 +1,53 @@
+class PostsController < ApplicationController
+  before_action :set_post, only: %i[ show update destroy ]
+
+  # GET /posts
+  # GET /posts.json
+  def index
+    @posts = Post.all
+  end
+
+  # GET /posts/1
+  # GET /posts/1.json
+  def show
+  end
+
+  # POST /posts
+  # POST /posts.json
+  def create
+    @post = Post.new(post_params)
+
+    if @post.save
+      render :show, status: :created, location: @post
+    else
+      render json: @post.errors, status: :unprocessable_entity
+    end
+  end
+
+  # PATCH/PUT /posts/1
+  # PATCH/PUT /posts/1.json
+  def update
+    if @post.update(post_params)
+      render :show, status: :ok, location: @post
+    else
+      render json: @post.errors, status: :unprocessable_entity
+    end
+  end
+
+  # DELETE /posts/1
+  # DELETE /posts/1.json
+  def destroy
+    @post.destroy
+  end
+
+  private
+    # Use callbacks to share common setup or constraints between actions.
+    def set_post
+      @post = Post.find(params[:id])
+    end
+
+    # Only allow a list of trusted parameters through.
+    def post_params
+      params.require(:post).permit(:content, :user_id, :quoted_post_id)
+    end
+end

app/models/post.rb

@@ -0,0 +1,27 @@
+class Post < ApplicationRecord
+  belongs_to :user
+  belongs_to :quoted_post, optional: true, class_name: 'Post'
+
+  validates :content, length: { maximum: 777 }
+  validates :content, presence: true, if: :quoted_post?
+
+  def kind
+    if quoted_post?
+      :quoted_post
+    elsif repost?
+      :repost
+    else
+      :post
+    end
+  end
+
+  private
+
+  def quoted_post?
+    content.present? && quoted_post_id
+  end
+
+  def repost?
+    content.blank? && quoted_post_id
+  end
+end

app/views/posts/_post.json.jbuilder

@@ -0,0 +1,4 @@
+json.extract! post, :id, :content, :user_id, :created_at, :updated_at
+json.url post_url(post, format: :json)
+
+json.quoted_post(post.quoted_post)

app/views/posts/index.json.jbuilder

@@ -0,0 +1 @@
+json.array! @posts, partial: "posts/post", as: :post

app/views/posts/show.json.jbuilder

@@ -0,0 +1 @@
+json.partial! "posts/post", post: @post

config/routes.rb

@@ -1,6 +1,5 @@
 Rails.application.routes.draw do
+  resources :posts, only: [:index, :show, :create]
   resources :user_follows, only: [:create, :destroy]
   resources :users, only: [:show]
-
-  # Define your application routes per the DSL in https://guides.rubyonrails.org/routing.html
 end

db/migrate/20220227194054_create_posts.rb

@@ -0,0 +1,11 @@
+class CreatePosts < ActiveRecord::Migration[7.0]
+  def change
+    create_table :posts do |t|
+      t.text :content, null: true
+      t.references :user, null: false, references: :user, foreign_key: { to_table: :users }
+      t.references :quoted_post, null: true, references: :post, foreign_key: { to_table: :posts }
+
+      t.timestamps
+    end
+  end
+end

db/schema.rb

@@ -10,10 +10,20 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema[7.0].define(version: 2022_02_27_175028) do
+ActiveRecord::Schema[7.0].define(version: 2022_02_27_194054) do
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
 
+  create_table "posts", force: :cascade do |t|
+    t.text "content"
+    t.bigint "user_id", null: false
+    t.bigint "quoted_post_id"
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
+    t.index ["quoted_post_id"], name: "index_posts_on_quoted_post_id"
+    t.index ["user_id"], name: "index_posts_on_user_id"
+  end
+
   create_table "user_follows", force: :cascade do |t|
     t.bigint "follower_id"
     t.bigint "followed_id"
@@ -30,6 +40,8 @@ ActiveRecord::Schema[7.0].define(version: 2022_02_27_175028) do
     t.index ["username"], name: "index_users_on_username"
   end
 
+  add_foreign_key "posts", "posts", column: "quoted_post_id"
+  add_foreign_key "posts", "users"
   add_foreign_key "user_follows", "users", column: "followed_id"
   add_foreign_key "user_follows", "users", column: "follower_id"
 end

db/seeds.rb

@@ -4,3 +4,6 @@ geonizeli = User.find_or_create_by(username: 'geonizeli')
 
 UserFollow.find_or_create_by(follower_id: xpto.id, followed_id: geonizeli.id)
 UserFollow.find_or_create_by(follower_id: geonizeli.id, followed_id: xpto.id)
+
+first_post = Post.find_or_create_by(content: 'Hello World!', user_id: xpto.id)
+Post.find_or_create_by(content: 'Hello World!', user_id: xpto.id, quoted_post_id: first_post.id)

spec/factories/posts.rb

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

spec/models/post_spec.rb

@@ -0,0 +1,31 @@
+require 'rails_helper'
+
+RSpec.describe Post, type: :model do
+  describe '#kind' do
+    context 'when post have other post reference and a content' do
+      it 'returns :quoted_post' do
+        quoted_post = create(:post)
+        post = create(:post, quoted_post: quoted_post)
+
+        expect(post.kind).to eq(:quoted_post)
+      end
+    end
+
+    context 'when post have other post reference and dont have a content' do
+      it 'returns :repost' do
+        quoted_post = create(:post)
+        post = create(:post, quoted_post: quoted_post, content: nil)
+
+        expect(post.kind).to eq(:repost)
+      end
+    end
+
+    context 'when post dont have other post reference and have a content' do
+      it 'returns :post' do
+        post = create(:post)
+
+        expect(post.kind).to eq(:post)
+      end
+    end
+  end
+end

spec/requests/posts_spec.rb

@@ -0,0 +1,88 @@
+require 'rails_helper'
+
+# This spec was generated by rspec-rails when you ran the scaffold generator.
+# It demonstrates how one might use RSpec to test the controller code that
+# was generated by Rails when you ran the scaffold generator.
+#
+# It assumes that the implementation code is generated by the rails scaffold
+# generator. If you are using any extension libraries to generate different
+# controller code, this generated spec may or may not pass.
+#
+# It only uses APIs available in rails and/or rspec-rails. There are a number
+# of tools you can use to make these specs even more expressive, but we're
+# sticking to rails and rspec-rails APIs to keep things simple and stable.
+
+RSpec.describe "/posts", type: :request do
+  let(:quoted_post) { create(:post) }
+
+  let(:valid_attributes) {
+    {
+      content: "Quo dolorem recusandae. Vero laborum deleniti. Qui ipsam illum.",
+      user_id: create(:user).id,
+    }
+  }
+
+  let(:invalid_attributes) {
+    {
+        content: "Quo dolorem recusandae. Vero laborum deleniti. Qui ipsam illum."
+    }
+  }
+
+  # This should return the minimal set of values that should be in the headers
+  # in order to pass any filters (e.g. authentication) defined in
+  # PostsController, or in your router and rack
+  # middleware. Be sure to keep this updated too.
+  let(:valid_headers) {
+    {}
+  }
+
+  describe "GET /index" do
+    it "renders a successful response" do
+      Post.create! valid_attributes
+      get posts_url, headers: valid_headers, as: :json
+      expect(response).to be_successful
+    end
+  end
+
+  describe "GET /show" do
+    it "renders a successful response" do
+      post = Post.create! valid_attributes
+      get post_url(post), as: :json
+      expect(response).to be_successful
+    end
+  end
+
+  describe "POST /create" do
+    context "with valid parameters" do
+      it "creates a new Post" do
+        expect {
+          post posts_url,
+               params: { post: valid_attributes }, headers: valid_headers, as: :json
+        }.to change(Post, :count).by(1)
+      end
+
+      it "renders a JSON response with the new post" do
+        post posts_url,
+             params: { post: valid_attributes }, headers: valid_headers, as: :json
+        expect(response).to have_http_status(:created)
+        expect(response.content_type).to match(a_string_including("application/json"))
+      end
+    end
+
+    context "with invalid parameters" do
+      it "does not create a new Post" do
+        expect {
+          post posts_url,
+               params: { post: invalid_attributes }, as: :json
+        }.to change(Post, :count).by(0)
+      end
+
+      it "renders a JSON response with errors for the new post" do
+        post posts_url,
+             params: { post: invalid_attributes }, headers: valid_headers, as: :json
+        expect(response).to have_http_status(:unprocessable_entity)
+        expect(response.content_type).to match(a_string_including("application/json"))
+      end
+    end
+  end
+end

spec/routing/posts_routing_spec.rb

@@ -0,0 +1,18 @@
+require "rails_helper"
+
+RSpec.describe PostsController, type: :routing do
+  describe "routing" do
+    it "routes to #index" do
+      expect(get: "/posts").to route_to("posts#index")
+    end
+
+    it "routes to #show" do
+      expect(get: "/posts/1").to route_to("posts#show", id: "1")
+    end
+
+
+    it "routes to #create" do
+      expect(post: "/posts").to route_to("posts#create")
+    end
+  end
+end