質問編集履歴
3
relationship経由の説明の追記
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Ruby on Railsで、ねこ特化型のインスタグラムのようなアプリを作っています。
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-
User -> Cat <- cat_photos経由 -> Photo
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User <- relationships経由 -> Cat <- cat_photos経由 -> Photo
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というアソシエーションを組んでいます。
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2
user-cat中間テーブルrelationshipの追記
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has_many :photos, dependent: :destroy
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# フォロー関連
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has_many :relationships
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has_many :following, through: :relationships, source: :cat
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end
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```
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```Ruby
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//フォロー用User_Cat中間モデル
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class Relationship < ApplicationRecord
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belongs_to :user
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belongs_to :cat
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with_options presence: true do
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validates :user_id, :cat_id
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end
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end
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```
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```Ruby
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//Catモデルマイグレーション
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```Ruby
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User-Catフォロー関係用テーブルマイグレーション
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class CreateRelationships < ActiveRecord::Migration[6.0]
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def change
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create_table :relationships do |t|
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t.references :user, foreign_key: true
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t.references :cat, foreign_key: true
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t.timestamps
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t.index %i[user_id cat_id], unique: true
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end
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end
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end
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```
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### 試したこと
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1
マイグレーションファイル・user modelを追記しました。
test
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test
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@@ -184,6 +184,32 @@
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```Ruby
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//Userモデル
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class User < ApplicationRecord
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# Include default devise modules. Others available are:
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# :confirmable, :lockable, :timeoutable, :trackable and :omniauthable
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devise :database_authenticatable, :registerable,
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:recoverable, :rememberable, :validatable
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has_many :cats, dependent: :destroy
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has_many :photos, dependent: :destroy
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以下省略
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```
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```Ruby
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//Catモデル
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```Ruby
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//Catモデルマイグレーション
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class CreateCats < ActiveRecord::Migration[6.0]
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def change
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create_table :cats do |t|
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t.string :cat_name, null: false
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t.integer :cat_sex_id
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t.integer :cat_age
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t.integer :cat_breed_id
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t.timestamps
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end
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end
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end
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//追記
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class AddUserIdToCats < ActiveRecord::Migration[6.0]
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def change
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add_reference :cats, :user, null: false, foreign_key: true
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end
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end
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```
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```Ruby
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//Photoモデルマイグレーション
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class CreatePhotos < ActiveRecord::Migration[6.0]
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def change
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create_table :photos do |t|
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t.text :detail
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t.timestamps
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end
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end
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end
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//追記
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class AddReferencesToPhotos < ActiveRecord::Migration[6.0]
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def change
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add_reference :photos, :user, null: false, foreign_key: true
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end
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end
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```
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```Ruby
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Cat-Photo中間テーブルマイグレーション
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class CreateCatPhotos < ActiveRecord::Migration[6.0]
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def change
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create_table :cat_photos do |t|
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t.references :cat, null: false, foreign_key: true
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t.references :photo, null: false, foreign_key: true
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t.timestamps
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end
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end
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end
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```
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384
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+
|
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245
385
|
### 試したこと
|
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246
386
|
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247
387
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