Ruby on Rails undefined method `products_path' routing issue

Question

It's been awhile since I've worked in Rails and I'm having some issues with setting up my routes properly. Any help would be greatly appreciated.

URL: http://localhost:3000/admin/products/new

Error: undefined method `products_path' for #<#<Class:0x007f9f569d0150>:0x007f9f578ccb18>

rake routes

admin_products     GET    /admin/products(.:format)          admin/products#index
                   POST   /admin/products(.:format)          admin/products#create
new_admin_product  GET    /admin/products/new(.:format)      admin/products#new
edit_admin_product GET    /admin/products/:id/edit(.:format) admin/products#edit
admin_product GET         /admin/products/:id(.:format)      admin/products#show
                   PUT    /admin/products/:id(.:format)      admin/products#update
                   DELETE /admin/products/:id(.:format)      admin/products#destroy

routes.rb

Aneprize::Application.routes.draw do
  devise_for :admins, :users

  namespace :admin do
    match '/', to: 'dashboard#index', as: '/'

    authenticated :admin do
      root to: 'dashboard#index', as: :root

      resources :products do
        resource  :contest
        resources :bids
        resources :photos
        resources :tags
      end
    end
  end

  root to: 'contests#index'
end

product.rb

class Product < ActiveRecord::Base
  attr_accessible :name, :retail_price, :short_description, :long_description, :weight

  has_one  :contest, dependent: :destroy
  has_many :photos,  dependent: :destroy
  has_many :bids,    dependent: :destroy
  has_many :tags

  validates :name, :short_description, :long_description, presence: true
  validates :retail_price, presence: true, numericality: { only_integer: true, greater_than_or_equal_to: 0 }
  validates :weight, presence: true, numericality: { only_integer: true, greater_than_or_equal_to: 1 }
end

contest.rb

class Contest < ActiveRecord::Base
  attr_accessible :product_id, :duration

  belongs_to :product, dependent: :destroy

  validates :product_id, presence: true, numericality: { only_integer: true, greater_than: 0 }
  validates :duration,   presence: true, numericality: { only_integer: true, greater_than: 2 }
end

product.rb

class Photo < ActiveRecord::Base
  attr_accessible :product_id, :image_url

  belongs_to :product

  validates :product_id, presence: true, numericality: { only_integer: true, greater_than: 0 }
  validates :image_url,  presence: true, format: { with: /^[^-\d].+/ }
end

bid.rb

class Bid < ActiveRecord::Base
  attr_accessible :product_id, :account_id, :amount

  belongs_to :account
  belongs_to :product, dependent: :destroy

  validates :account_id, :product_id, :amount, presence: true, numericality: { only_integer: true, greater_than: 0 }
end

tag.rb

class Tag < ActiveRecord::Base
  attr_accessible :name, :product_id

  belongs_to :product

  validates :name, presence: true, format: { with: /^\D+$/ }
  validates :product_id, presence: true, numericality: { only_integer: true, greater_than: 0 }
end

Answer 1

As you are getting error at URL: http://localhost:3000/admin/products/new so you should have some problems with your form builder.

While you have products resources in :admin namespace you should take this fact into account while building form. Correct example is:

<%= form_for [:admin, @product] do |f| %>
  ... # whatever
<% end %>

instead of just

<%= form_for @product do |f| %>
  ... # whatever
<% end %>

Answer 2

Somewhere in your new template you are calling products_path. Since it is under admin you should change it to admin_products_path