Rails 4 Nested Resources, Forms, strong params - ruby-on-rails

Question

I am trying to create a workout tracker. I have these nested resources
Routes.rb
resources :days do
resources :workouts
resources :meals
end
My models look fine:
Workout.rb
class Workout < ActiveRecord::Base
has_many :exercises
belongs_to :day
end
Day.rb
class Day < ActiveRecord::Base
has_many :workouts
has_many :meals
accepts_nested_attributes_for :workouts, :allow_destroy => true
accepts_nested_attributes_for :meals, :allow_destroy => true
end
The issue lies when I try to create a new workout..
../views/workouts/_form.html.haml
= form_for([#day, #workout]), html: {class: 'form-horizontal'}) do |f|
= f.input :workout, label: "What did you work out", input_html: { class: "form-control"}
= f.input :mood, label: "How do you feel", input_html: { class: "form-control"}
= f.hidden_field :day_id, value: params[:day_id], input_html: { class: "form-control"}
= f.submit
I cant seem to save the :day_id the workout is associated with the workout though using strong params to receive them.
WorkoutsController.rb
private
def workout_params
params.require(:workout).permit(:day_id, :name, :mood)
end
def find_day
#day = Day.find(params[:day_id])
end
Instead what gets saved is a nil for :day_id
Rails Console:
Workout id: 11, name: "Hey", mood: "no", day_id: nil, created_at: "2014-12-19 14:53:29", updated_at: "2014-12-19 14:53:29"
HELP?
PS - i tried to do
= form_for([#day, #workout]), as: :foo, html: {class: 'form-horizontal'}) do |f|
= f.input :workout, label: "What did you work out", input_html: { class: "form-control"}
= f.input :mood, label: "How do you feel", input_html: { class: "form-control"}
= f.hidden_field :day_id, value: params[:day_id], input_html: { class: "form-control"}
= f.submit
and then
def workout_params
params.require(:foo).permit(:day_id, :name, :mood)
end
But it just kept saying the :foo params where empty

Answer 1

The way your routes are set up, I am assuming that the day_id is being passed as a url params:
/days/:day_id/workouts
If that is the case, then you do not need to worry about #day in the form, nor the day_id in the workout_params
Form:
= form_for #workout, html: {class: 'form-horizontal'}) do |f|
= f.input :workout, label: "What did you work out", input_html: { class: "form-control"}
= f.input :mood, label: "How do you feel", input_html: { class: "form-control"}
= f.submit
Controller:
def create
#workout = #day.workouts.new(workout_params)
....
end
private
def workout_params
params.require(:workout).permit(:name, :mood)
end
def find_day
#day = Day.find(params[:day_id])
end