如何在ActiveRecord :: Result上调用关联

Question

我有两个型号City和State。以下是城市与州之间的关联。

state.rb

has_many :cities

city.rb

belongs_to :state

我执行下面的查询，

connection = ActiveRecord::Base.connection
query = "select * from states"
@states = connection.exec_query(query);

现在我正在迭代，

@states.each do |s|
  s.cities # gives me an error because it is not an state object
end 

我想要它，

state = State.last

cities = state.cities

如何使用@states在使用循环迭代它时执行此操作？

Answer 1

您将需要使用这样的ActiveRecord关联：

State.all.each { |state| state.cities }