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Rails nested routing   shallow edit not working
resources :customers do
  resources :electricity_counters, :shallow => true do
    resources :electricity_bills, :shallow => true
  end
end

<%= form_for([@customer, @customer.electricity_counters.build]) do |f| %>

# GET customers/1/electricity_counters/new
  def new
    @customer = Customer.find(params[:customer_id])
    @electricity_counter = @customer.electricity_counters.build
  end

  # GET /electricity_counters/1/edit
  def edit
    @electricity_counter = ElectricityCounter.find(params[:id])
    @customer = @electricity_counter.customer
  end

belongs_to :customer

<%= form_for([@customer, @customer.electricity_counters.build]) do |f| %>

def new
  @customer = Customer.find(params[:customer_id])
  @electricity_counter = @customer.electricity_counters.build
  @path = [@customer, @electricity_counter]
end

def edit
  @electricity_counter = ElectricityCounter.find(params[:id])
  @customer = @electricity_counter.customer
  @path = @electricity_counter
end

<%= form_for(@path) do |f| %>

resources :customers, :shallow => true do
  resources :electricity_counters, :shallow => true do
    resources :electricity_bills
  end
end