rails has_many through. doesnt get it to work -

i'm trying create has many through association i've must have gotten wrong.

i believe got association code right when try create joined records get.

1.9.3p194 :001 > d = day.find(1) day load (3.9ms) select "days".* "days" "days"."id" = ? limit 1 [["id", 1]] => # 1.9.3p194 :002 > d.students.create!(:id => 1) (0.1ms) begin transaction sql (2.0ms) insert "students" ("created_at", "name", "updated_at") values (?, ?, ?) [["created_at", thu, 18 apr 2013 12:49:25 utc +00:00], ["name", nil], ["updated_at", thu, 18 apr 2013 12:49:25 utc +00:00]] (0.8ms) rollback transaction activerecord::unknownattributeerror: unknown attribute: day_id

models

# == schema information # # table name: students # #  id         :integer          not null, primary key #  name       :string(255) #  created_at :datetime         not null #  updated_at :datetime         not null #  class student < activerecord::base   attr_accessible :name   has_many :days, :through => :days_students   has_many :days_students, :dependent => :destroy, :class_name => "daystudent" end  # == schema information # # table name: days # #  id         :integer          not null, primary key #  created_at :datetime         not null #  updated_at :datetime         not null #  class day < activerecord::base   #attr_accessible    has_many :students, :through => :days_students   has_many :days_students, :dependent => :destroy, :class_name => "daystudent" end  # == schema information # # table name: day_students # #  id          :integer          not null, primary key #  students_id :integer #  days_id     :integer #  created_at  :datetime         not null #  updated_at  :datetime         not null #  class daystudent < activerecord::base   attr_accessible :student_id, :day_id   belongs_to :day   belongs_to :student end 

your attributes in day_students table should be:

• day_id
• student_id