usersテーブル

Column	Type	Options
name	string	null: false, unique: true
email	string	null:false, unique: true
password	string	null: false, unique: true

Association

• has_many :posts
• has_many :groups_users
• has_many :groups, through: :groups_users

groupsテーブル

Column	Type	Options
name	string	null: false, unique: true

Association

• has_many :posts
• has_many :groups_users
• has_many :users, through: :groups_users

groups_usersテーブル

Column	Type	Options
user_id	integer	null: false, foreign_key: true
group_id	integer	null: false, foreign_key: true

Association

• belongs_to :group
• belongs_to :user

postsテーブル

Column	Type	Options
text	text
image	text
user_id	integer	null: false, foreign_key: true
group_id	integer	null: false, foreign_key: true

Association

• belongs_to group
• belongs_to user