Question

如果我有两个表格users和blocked_users，我如何定义从blocked_users到users的关系？

例如，

class User < Sequel::Model

  one_to_many :blocked_users,     :key=>:source_id
  one_to_many :blocked_by_users,  :key=>:target_id, :class => BlockedUser

end

我会在这里放什么？：

# table => blocked_users, fields => "source_id", "target_id"

Class BlockedUser < Sequel:Model

  #fail => belongs_to :blocking_user_account, :class => User, :primary_key => :source_id
  #fail => belongs_to :blocked_user_account,  :class => User, :primary_key => :target_id

end

我如何引用User模型中的BlockedUser模型？

我尝试了下面的修复，并对以下错误感到困惑;将BlockedUser类重组为如下：

class BlockedUser < Sequel::Model
  many_to_one :blocking_user, :class=>:User, :primary_key => :source_id
  many_to_one :blocked_user,  :class=>:User, :primary_key => :target_id
end

我收到以下错误：

.9.3p0 :003 > BlockedUser.all.first.blocked_user
   INFO - (0.000427s) SELECT * FROM `blocked_users`
NoMethodError: undefined method `blocked_user_id' for #<BlockedUser @values={:id=>1, :source_id=>1, :target_id=>2}>

但这确实执行了适当的查询：

class BlockedUser < Sequel::Model
  many_to_one :source, :class=>:User
  many_to_one :target, :class=>:User
end

BlockedUser.all.first.source

Answer 1

您应该将类名指定为符号（并使用many_to_one而不是belongs_to）：

class BlockedUser < Sequel:Model
  many_to_one :blocking_user, :class=>:User, :primary_key => :source_id
  many_to_one :blocked_user,  :class=>:User, :primary_key => :target_id
end

如何创建续集ORM自我指涉关系？

1 个答案: