协会如下：
FileNotFoundException: Bulkload dir /user/hadoop/outputfile not found
我想做类似的事情会导致#app/models/pet.rb
class Pet < ActiveRecord::Base
belongs_to :pet_store
end
#app/models/pet_store.rb
class PetStore < ActiveRecord::Base
has_many :pets, dependent: :destroy
has_many :employees, dependent: :destroy
end
#app/models/employee.rb
class Employee < ActiveRecord::Base
belongs_to :pet_store
end
错误：
N + 1这会导致N + 1错误，因为必须为每个@pets = Pet.where(species: "Dog").includes(:pet_store)
@pets.each do |pet|
pet.pet_store.employees.each do |employee|
puts employee.name
end
end
进行查询。我想employee间接关联的eager load。但是，我不能简单地employees，因为includes(:employees)与pet没有直接关联。怎么办呢？
答案 0 :(得分：3)