问格式嵌套帮助

EN

class Routine < ActiveRecord::Base
  has_many :exercise_routines
  has_many :exercises, :through => :exercise_routines
  accepts_nested_attributes_for :exercise_routines
end

class ExerciseRoutine < ActiveRecord::Base
  belongs_to :exercise
  belongs_to :routine
  has_many :attempts
  accepts_nested_attributes_for :attempts
end

%h2 Exercises:

%ol
  - for exercise_routine in @routine.exercise_routines
    %li= exercise_routine.exercise.name
    %ul
      %li
        = exercise_routine.sets
        Sets
      %li
        = exercise_routine.reps
        Reps
      %li
        Attempt: 
        - for attempt in exercise_routine.attempts
          = attempt.reps
        = semantic_form_for @routine do |routine|
          = routine.semantic_fields_for exercise_routine do |exercise_routine|
            = exercise_routine.semantic_fields_for :attempts do |attempt|
              = attempt.input :reps, :required => false
          = routine.buttons`

{"utf8"=>"✓",
 "_method"=>"put",
 "authenticity_token"=>"51fZRe1wKRQoVUz+lGlldd4DmMODGHN203Htc4DEi0Y=",
 "routine"=>{"exercise_routine"=>{"attempts_attributes"=>{"0"=>{"reps"=>"5",
 "id"=>"1"},
 "1"=>{"reps"=>"1555",
 "id"=>"2"},
 "2"=>{"reps"=>""}}}},
 "commit"=>"Update Routine",
"id"=>"3"}`

@routine.exercise_routines.each do |er|
  1.times {er.attempts.build}
end