質問編集履歴

class User、class Relationship、及びmigration(create_relationships)を追加致しました。

2020/01/15 09:39

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punchan36

スコア105

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@@ -166,7 +166,131 @@
 </div>
+```
+### 該当のコード(user.rb)
+```ruby
+class User < ApplicationRecord
+  # Include default devise modules. Others available are:
+  # :confirmable, :lockable, :timeoutable, :trackable and :omniauthable
+  devise :database_authenticatable, :registerable,
+         :recoverable, :rememberable, :validatable
+  has_secure_password
+  validates :name, {presence: true}
+  validates :email, {presence: true, uniqueness: true}
+  def posts
+    return Post.where(user_id: self.id)
+  end
+  has_many :following_relationships, foreign_key: "follower_id", class_name: "Relationship", dependent: :destroy
+  has_many :followings, through: :following_relationships
+  has_many :follower_relationships, foreign_key: "following_id", class_name: "Relationship", dependent: :destroy
+  has_many :followers, through: :follower_relationships
+  def following?(other_user)
+    following_relationships.find_by(following_id: other_user.id)
+  end
+  def follow!(other_user)
+    following_relationships.create!(following_id: other_user.id)
+  end
+  def unfollow!(other_user)
+    following_relationships.find_by(following_id: other_user.id).destroy
+  end
+end
+```
+### 該当のコード(relationship.rb)
+```ruby
+class Relationship < ApplicationRecord
+  belongs_to :follower, class_name: "User"
+  belongs_to :following, class_name: "User"
+  validates :follower_id, presence: true
+  validates :following_id, presence: true
+end
+```
+### 該当のコード(migration create_relationships)
+```ruby
+class CreateRelationships < ActiveRecord::Migration[5.2]
+  def change
+    create_table :relationships do |t|
+      t.integer :follower_id
+      t.integer :followed_id
+      t.timestamps
+    end
+    add_index :relationships, :follower_id
+    add_index :relationships, :followed_id
+    add_index :relationships, [:follower_id, :followed_id], unique: true
+  end
+end
 ```