Rails 4 nested resource hash not committed to database - ruby-on-rails

Question

This is my first app in Rails 4, but I'm not sure whether Rails 4 is the problem.
I have nested resources as follows:
resources :made_games do
resources :made_game_instances
end
When I try to save a new made_game_instance this is what's happening in the log:
Started POST "/made_games/11/made_game_instances" for 127.0.0.1 at 2013-09-10 12:03:55 -0700
Processing by MadeGameInstancesController#create as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"jEN2syjftjRtf3DBnijtp7gNVUEFrI+HYTUs+HFgo5M=", "made_game_instance"=>{"new_word1"=>"bluesky"}, "commit"=>"Create Made game instance", "made_game_id"=>"11"}
MadeGame Load (122.7ms) SELECT "made_games".* FROM "made_games" WHERE "made_games"."id" = $1 LIMIT 1 [["id", "11"]]
(14.0ms) BEGIN
SQL (215.9ms) INSERT INTO "made_game_instances" ("created_at", "made_game_id", "updated_at") VALUES ($1, $2, $3) RETURNING "id" [["created_at", Tue, 10 Sep 2013 19:03:55 UTC +00:00], ["made_game_id", 11], ["updated_at", Tue, 10 Sep 2013 19:03:55 UTC +00:00]]
(5.7ms) COMMIT
Redirected to http://localhost:3000/made_games/11/made_game_instances/5
Completed 302 Found in 458ms (ActiveRecord: 358.3ms)
You can see that the params hash contains the hash where the new_game_instance attribute :new_word1 is assigned the value "bluesky." What I cannot figure out is why this assignment does not appear in the SQL that is subsequently generated when the new 'made_game_instances' object is created.
Additional information
Since this is Rails 4, in order to whitelist all the parameters (at least at this stage in development), I have used permit! in the params private method at the bottom of the controllers for both made_games and made_game_instances.
The made_games controller:
class MadeGamesController < ApplicationController
def new
#made_game = MadeGame.new
end
def create
#made_game = MadeGame.new(made_game_params)
if #made_game.save
flash[:notice] = "Here you go!"
redirect_to #made_game
else
flash[:notice] = "Something about that didn't work, unfortunately."
render :action => new
end
end
def show
#made_game = MadeGame.find(params[:id])
end
private
def made_game_params
params.require(:made_game).permit!
end
end
Here is a link to the github repo: https://github.com/keb97/madlibs/tree/users_making
The form used to create a new made_game_instance is:
<%= simple_form_for [#made_game, #made_game_instance] do |f| %>
<p>
<%= f.input :new_word1, label: #made_game.word1.to_s %>
</p>
<%= f.button :submit %>
<% end %>
I should also note that there is one form for made_game, and a separate form for made_game_instance, rather than a nested form, so I do not believe this is an issue of accepts_nested_attributes_for or fields_for.

Answer 1

In your made_games_instance_controller.rb
this line...
#made_game_instance = #made_game.made_game_instances.build(params[:made_game_instance_params])
should actually be...
#made_game_instance = #made_game.made_game_instances.build(made_game_instance_params)
There is no params hash entry with a symbol key :made_game_instance_params