轨道 与我的关系有问题

Question

我想有一个模型Game有两个用户：user1和user2

这是我的两个模型及其迁移：

游戏.rb：

class Game < ApplicationRecord
has_secure_token
# @!group RELATIONS
has_many :turns, dependent: :destroy
has_many :play_cards, dependent: :destroy
has_one :user1, class_name: 'User', dependent: :destroy
has_one :user2, class_name: 'User', dependent: :destroy
# @!endgroup
# @!group VALIDATORS
validates :user1_id, presence: true, blank: false, nill: false
validates :user2_id, presence: true, blank: false, nill: false
validates :finish_at, presence: true, blank: false, nill: false
validates :token, presence: true, blank: false, nill: false, length: { is: 24 }
# @!endgroup
end

迁移：

def change
create_table :games do |t|
t.references :user1, foreign_key: { to_table: :users }
t.references :user2, foreign_key: { to_table: :users }
t.string :token, length: { is: 24 }, null: false
t.datetime :finish_at, null: false
t.timestamps
end
end

用户.rb：

class User < ApplicationRecord
has_secure_token :token
# @!group RELATIONS
has_many :decks, dependent: :destroy
has_one :chosen_deck, class_name: 'Deck', dependent: :destroy
has_many :turns, dependent: :destroy
# @!endgroup
# @!group VALIDATORS
validates :hp, presence: true, blank: false, nill: false, numericality: { greater_than_or_equal_to: 0 }
validates :armor, presence: true, blank: false, nill: false, numericality: { greater_than_or_equal_to: 0 }
validates :token, presence: true, blank: false, nill: false, length: { is: 24 }, on: :save
validates :name, presence: true, blank: false, nill: false, length: { minimum: 4 }
# @!endgroup
end

迁移：

create_table :users do |t|
t.references :chosen_deck, index: true, foreign_key: { to_table: :decks }
t.string :name, null: false
t.integer :hp, null: false, default: 20
t.integer :armor, null: false, default: 0
t.string :token, length: { is: 24 }, null: false
t.timestamps
end

当我尝试用它保存游戏时，麻烦就会附加：

ActiveModel::MissingAttributeError: can't write unknown attribute `game_id`

我在这里放了一个截图：错误屏幕

有好的一天

Answer 1

ActiveModel：：MissingAttributeError： 无法写入未知属性game_id

问题恰恰在于错误所说的内容。User模型缺少game_id属性，这是连接用户和游戏的约定所必需的(如果需要另一列，则应将其显式指定为foreign_key(

只需为users创建一个game_id列，并在User模型中指定(不必要的(belongs_to :game，因为用户belongs_to游戏。

否则，由于您有user1_id和user2_id，您需要将has_one更改为belongs_to.然后，它将更新这些belongs_to列，而不是在has_one关联中查找game_id。

class Game < ApplicationRecord
# @!group RELATIONS
has_many :turns, dependent: :destroy
has_many :play_cards, dependent: :destroy
belongs_to :user1, class_name: 'User', dependent: :destroy
belongs_to :user2, class_name: 'User', dependent: :destroy
# @!endgroup
end