Adding data to nested model rails 4.0 - ruby-on-rails

Question

New to rails and can't figure out how to do this. I have implemented a user log in system using devise and I am trying to let a user create multiple "listings". Sort of like a craigslist type site. I can populate the database from the rails console but I cant figure out how to put it on the site.
I have the following models:
listing.rb
class Listing < ActiveRecord::Base
belongs_to :user
default_scope -> { order('created_at DESC') }
#add validations
validates :user_id, presence: true
end
user.rb (used devise)
class User < ActiveRecord::Base
has_many :listings, dependent: :destroy
# Include default devise modules. Others available are:
# :token_authenticatable, :confirmable,
# :lockable, :timeoutable and :omniauthable
devise :database_authenticatable, :registerable,
:recoverable, :rememberable, :trackable, :validatable
end
I am trying to create a page which allows a user to create a new listing. I am not exactly sure how to go about doing this. This is what I have currently:
listings_controller.rb
class ListingsController < ApplicationController
def index
#users = User.all
end
def show
#listing = Listing.find(params[:id])
end
def new
#listing = Listing.new
end
def create
#listing = Listing.new(listing_params)
if #listing.save
flash[:success] = "Success"
redirect_to #listing
else
render 'new'
end
end
private
def listing_params
params.require(:listing).permit(:id, :user_id, :title, :general_info)
end
end
models/views/listings/new.html.erb
<h1> POST A NEW LISTING </h>
<%= form_for #listing do |f| %>
Title: <%= f.text_field :title %> <br />
General Info: <%= f.text_field :general_info %> <br />
<%= f.submit %>
<% end %>
Ive been working on this for quite a while with no luck getting the database to populate. Currently the form once submits hits the "else" in def create and just renders the same page.
Here is the log output when I run this:
Started POST "/listings" for 127.0.0.1 at 2013-07-04 17:37:53 -0600
Processing by ListingsController#create as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"mlyDb24OMQkniOCFQ1JTvzxjplHk7kMgzEBEFBH8hGw=", "listing"=>{"title"=>"title should go here", "general_info"=>"hope this works"}, "commit"=>"Create Listing"}
[1m[35m (0.1ms)[0m begin transaction
[1m[36m (0.1ms)[0m [1mrollback transaction[0m
[1m[35mUser Load (0.3ms)[0m SELECT "users".* FROM "users" WHERE "users"."id" = 1 ORDER BY "users"."id" ASC LIMIT 1
Rendered listings/new.html.erb within layouts/application (4.4ms)
Completed 200 OK in 17ms (Views: 10.4ms | ActiveRecord: 0.5ms)

Answer 1

The following got this to work for anyone who comes across this problem:
In routes.db I put the listings in a block:
resources :users do
resource :listings
end
For the new/show/create methods I made sure to search for the user first (note since I am using devise the current_user.id)
def show
#listing = Listing.find(current_user.id)
end
def new
#user = User.find(current_user.id)
#listing = #user.listings.build
end
def create
#user = User.find(current_user.id)
#listing = #user.listings.build(listing_params)
if #listing.save
flash[:success] = "Success"
redirect_to root_path
else
render :action => 'new'
end
end
then finally, changed the form_for in new.html.erb to this:
<%= form_for [#user, #listing] do |f| %>
<%= f.label :title, 'Title' %> <br />
<%= f.text_field :title %>
...
<%= f.submit "submit" %>
<% end %>