如何在ActiveRecord :: Result上调用关联

Question

我有两个模型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

我在查询下面执行了

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

现在我要遍历，

@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

在使用循环遍历@states时如何使用它{}？

Answer 1

您将要使用ActiveRecord关联，如下所示：

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