Question

我正在尝试从User中获取事件，其中EventView.promoter_id = User.id但它无法正常工作。这是我的设置（目前不正确）：

User
has_many :events
has_many :promoted_event_views, :foreign_key => :promoter_id, :class_name => "EventView"
has_many :promoted_events, :through => :event_views, :foreign_key => :promoter_id #foreign key seems to be getting ignored

EventView
belongs_to :event
belongs_to :promoted_event, :class_name => "Event", :foreign_key => :event_id
belongs_to :promoter, :foreign_key => :promoter_id, :class_name => "User"

数据库设置为：

User
id
..etc (irrelevant)

Event
id
user_id
...etc (irrelevant)

EventView
id
user_id
event_id
promoter_id
...etc (irrelevant)

我正打算打电话：

User.all.first.promoted_events

它有效，但它给了我错误的信息！它与EventViews上的promoter_id（我想要的）无关，而是在事件上使用user_id

以下是数据库中发生的事情：

User Load (0.2ms)  SELECT `users`.* FROM `users` ORDER BY `users`.`id` ASC LIMIT 1
Event Load (2.1ms)  SELECT `events`.* FROM `events` INNER JOIN `event_views` ON `events`.`id` = `event_views`.`event_id` INNER JOIN `events` `events_promoted_events_join` ON `event_views`.`event_id` = `events_promoted_events_join`.`id` WHERE `events_promoted_events_join`.`user_id` = 1

很明显。user_id = 1引起了问题，如何将其更改为promoter_id = 1？我已经尝试在用户模型中设置primary_key和foreign_key，但它似乎被忽略了。

另外：我尝试使用finder_sql，但在Rails 4中已弃用

Answer 1

User
has_many :events
has_many :promoted_event_views, :foreign_key => 'promoter_id'
has_many :event_views
has_many :promoted_events, :through => :event_views, :source => :promoted_event

EventView
belongs_to :user
belongs_to :promoted_event, :class_name => "Event", :foreign_key => 'event_id'
belongs_to :promoter, :foreign_key => 'promoter_id', :class_name => 'User'

has_many通过不同的外键

1 个答案: