質問編集履歴

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2020/09/09 16:00

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Asahi_sun_

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test CHANGED Viewed

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test CHANGED Viewed

@@ -259,3 +259,179 @@
 <% end %>
 ```
+commentモデル
+```ここに言語を入力
+class Comment < ApplicationRecord
+  belongs_to :user
+  belongs_to :book
+  validates :content, presence: true, length: { maximum: 30 }
+end
+```
+bookモデル
+```ここに言語を入力
+class Book < ApplicationRecord
+  belongs_to :user
+  has_many :likes, dependent: :destroy
+  has_many :liked_user, through: :likes, source: :user
+  has_many :comments, dependent: :destroy
+  has_many :commented_user, through: :comments, source: :user
+  default_scope -> { order(created_at: :desc) }
+  validates :title,        presence: true, length: { maximum: 100 }
+  validates :author,       presence: true, length: { maximum: 50 }
+  validates :publisher,    presence: true, length: { maximum: 50 }
+  validates :publish_year, presence: true
+  validates :user_id,      presence: true
+  validates :explanation,  length: { maximum: 140 }
+end
+```
+userモデル
+```ここに言語を入力
+class User < ApplicationRecord
+  has_many :books, dependent: :destroy
+  has_many :active_relationships,  class_name:  "Relationship",
+                                   foreign_key: "follower_id",
+                                   dependent:   :destroy
+  has_many :passive_relationships, class_name:  "Relationship",
+                                   foreign_key: "followed_id",
+                                   dependent:   :destroy
+  has_many :following, through: :active_relationships,  source: :followed
+  has_many :followers, through: :passive_relationships, source: :follower
+  has_many :likes, dependent: :destroy
+  has_many :liked_books, through: :likes, source: :book
+  has_many :comments, dependent: :destroy
+  has_many :commented_books, through: :comments, source: :book
+  before_save { self.email.downcase! }
+  validates :name, presence: true, length: { maximum: 50 }
+  VALID_EMAIL_REGEX = /\A[\w+\-.]+@[a-z\d\-]+(.[a-z\d\-]+)*.[a-z]+\z/i
+  validates :email, presence: true, length: { maximum: 255 },
+                    format: { with: VALID_EMAIL_REGEX },
+                    uniqueness: true
+  has_secure_password
+  validates :password, presence: true, length: { minimum: 6 }, allow_nil: true
+  #渡された文字列のハッシュ値を返す
+  def User.digest(string)
+    cost = ActiveModel::SecurePassword.min_cost ? BCrypt::Engine::MIN_COST :
+                                                  BCrypt::Engine.cost
+    BCrypt::Password.create(string, cost: cost)
+  end
+  def feed
+    following_ids = "SELECT followed_id FROM relationships
+                     WHERE follower_id = :user_id"
+    Book.where("user_id IN (#{following_ids})
+                OR user_id = :user_id", user_id: id)
+  end
+  def follow(other_user)
+    following << other_user
+  end
+  def unfollow(other_user)
+    active_relationships.find_by(followed_id: other_user.id).destroy
+  end
+  def following?(other_user)
+    following.include?(other_user)
+  end
+  def followed_by?(other_user)
+    followers.include?(other_user)
+  end
+  def already_liked?(book)
+    self.likes.exists?(book_id: book.id)
+  end
+end
+```