質問編集履歴
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回答に対しての追加記述
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@@ -119,3 +119,91 @@
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以上になります。ご助言いただけると幸いです。
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##追加（マイグレーションとモデル）
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```migration
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#groups
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class CreateGroups < ActiveRecord::Migration[6.0]
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def change
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create_table :groups do |t|
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t.string :name, null: false, unique: true
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t.string :content
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t.references :user, 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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#group_users
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class CreateGroupUsers < ActiveRecord::Migration[6.0]
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def change
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create_table :group_users do |t|
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t.references :group, foreign_key: true
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t.references :user, 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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```model
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#Group
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class Group < ApplicationRecord
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has_many :group_users
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has_many :users, through: :group_users, dependent: :destroy
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has_many :tweets, dependent: :destroy
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belongs_to :user
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validates :name, presence: true, uniqueness: true
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end
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#GroupUser
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class GroupUser < ApplicationRecord
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belongs_to :group
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belongs_to :user
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end
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```
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