Bookmarkモデルを生成して制約を追加する
$ rails g model Bookmark user:references board:references`
一意性制約をつける
class CreateBookmarks < ActiveRecord::Migration[5.2]
def change
create_table :bookmarks do |t|
t.references :user, foreign_key: true
t.references :board, foreign_key: true
t.timestamps
t.index [:user_id, :board_id], unique: true
end
end
end
その後、$ rails db:migrate
モデルにも同じ内容を追加する
bookmark.rb
class Bookmark < ApplicationRecord
belongs_to :user
belongs_to :board
validates :user_id, uniqueness: { scope: :board_id }
end
モデルにアソシエーションを追加
user.rb
has_many :boards, dependent: :destroy
has_many :comments, dependent: :destroy
has_many :bookmarks, dependent: :destroy
has_many :bookmark_boards, through: :bookmarks, source: :board
ルーティングの追加
resources :users, only: %i[new create]
resources :boards do
resources :comments, only: %i[create update destroy], shallow: true
collection do
get :bookmarks
end
end
resources :bookmarks, only: %i[create destroy]
bookmarks_controllerの生成
$ rails g controller bookmarks create destroy
bookmark処理と判定する処理をモデルに追加
user.rb
def bookmark(board)
bookmark_boards << board
end
def unbookmark(board)
bookmark_boards.destroy(board)
end
def bookmark?(board)
bookmark_boards.include?(board)
end
コントローラー追記
bookmarks_controller
class BookmarksController < ApplicationController
def create
board = Board.find(params[:board_id])
current_user.bookmark(board)
redirect_back fallback_location: root_path, success: t('defaults.message.bookmark')
end
def destroy
board = current_user.bookmarks.find(params[:id]).board
current_user.unbookmark(board)
redirect_back fallback_location: root_path, success: t('defaults.message.unbookmark')
end
end
お気に入りした掲示板の一覧表示するためのアクション追加
boards_controller.rb
def bookmarks
@bookmark_boards = current_user.bookmark_boards.includes(:user).order(created_at: :desc)
end
viewの設定
お気に入りボタンを用意
views/board/_board.html.erb
<% if current_user.own?(board) %>
<%= render 'crud_menus', board: board %>
<% else %>
<%= render 'bookmark_button', board:board %>
<% end %>
- <% if current_user.own?(board) %>は以前作成した判定のメソッドを使用している
def own?(object)
id == object.user_id
end
view/boards/_bookmark_button.html.erb
<% if current_user.bookmark?(board) %>
<%= render 'unbookmark', { board: board } %>
<% else %>
<%= render 'bookmark', { board: board } %>
<% end %>
def bookmark?(board)
bookmark_boards.include?(board)
end
お気に入り解除のボタン
view/boards/_unbookmark.html.erb
<%= link_to bookmark_path(current_user.bookmarks.find_by(board_id: board.id)), id: "js-bookmark-button-for-board-#{board.id}", class: 'float-right', method: :delete do %>
<%= icon 'fas', 'star' %>
<% end %>
お気に入りするボタン
<%= link_to bookmarks_path(board_id: board.id), id: "js-bookmark-button-for-board-#{board.id}",class: 'float-right', method: :post do %>
<%= icon 'far', 'star' %>
<% end %>
お気に入り一覧画面の作成
views/boards/bookmarks
<省略>
<!-- 掲示板一覧 -->
<% if @bookmark_boards.present? %>
<%= render @bookmark_boards %>
<% else %>
<p><%= t('bookmarks.bookmarks.no_result') %></p>
<% end %>