feat: comment model added

Author: yoshi0701

app/models/comment.rb

@@ -0,0 +1,6 @@
+class Comment < ApplicationRecord
+  validates :body, presence: true
+
+  belongs_to :product
+  belongs_to :user
+end

app/models/product.rb

@@ -10,6 +10,7 @@ class Product < ApplicationRecord
   }
 
   belongs_to :user
+  has_many :comments, dependent: :destroy
 
   def owned_by?(owner)
     user == owner

db/migrate/20191105032008_create_comments.rb

@@ -0,0 +1,11 @@
+class CreateComments < ActiveRecord::Migration[6.0]
+  def change
+    create_table :comments do |t|
+      t.text :body
+      t.references :product, null: false, foreign_key: true
+      t.references :user, null: false, foreign_key: true
+
+      t.timestamps
+    end
+  end
+end

db/schema.rb

@@ -10,7 +10,17 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2019_11_04_101016) do
+ActiveRecord::Schema.define(version: 2019_11_05_032008) do
+
+  create_table "comments", force: :cascade do |t|
+    t.text "body"
+    t.integer "product_id", null: false
+    t.integer "user_id", null: false
+    t.datetime "created_at", precision: 6, null: false
+    t.datetime "updated_at", precision: 6, null: false
+    t.index ["product_id"], name: "index_comments_on_product_id"
+    t.index ["user_id"], name: "index_comments_on_user_id"
+  end
 
   create_table "products", force: :cascade do |t|
     t.string "name"
@@ -34,5 +44,7 @@
     t.index ["email"], name: "index_users_on_email", unique: true
   end
 
+  add_foreign_key "comments", "products"
+  add_foreign_key "comments", "users"
   add_foreign_key "products", "users"
 end

spec/factories/comments.rb

@@ -0,0 +1,7 @@
+FactoryBot.define do
+  factory :comment do
+    body { "MyText" }
+    product { "" }
+    user { nil }
+  end
+end

spec/models/comment_spec.rb

@@ -0,0 +1,5 @@
+require 'rails_helper'
+
+RSpec.describe Comment, :type => :model do
+  pending "add some examples to (or delete) #{__FILE__}"
+end