的Rails：在ActiveRecord的印刷協會督察

Question

當我打印部門的ActiveRecord的，我得到：

部：0x210ec4c { ：ID => 3， ：名稱=> 「計算機科學」， ... ：學校ID => 3 }

我怎樣才能讓它給我的學校，而不是學校ID的？換句話說，請在school_id發現的學校上致電to_s。隨便怎麼樣時，我有一處d，我可以說

d.school

爲了澄清，我專門詢問有關打印的ActiveRecord，以及有關司類，而不是特定的實例。我在想，如果有到PATCH ActiveRecord的，這樣，當我在控制檯打印Department類，我得到各個部門的school.to_s代替school.id

Answer 1

如果這樣你assosciation像下面

class School < ActiveRecord::Base 
    has_many :departments, :dependent => :destroy 
end 

class Department < ActiveRecord::Base 
    belongs_to :schools, :dependent => :destroy 
end 

然後

@department =Department.find(1) #For example here 
@department.school #gives you the school object 
# (i assume you are saving schoolname in 'name' column of schools table) 
@department.school.name #This gives you school name