model - Ruby on Rails Saving in two tables from one form

Question

I have two models Hotel and Address. Relationships are:

class Hotel
  belongs_to :user
  has_one    :address
  accepts_nested_attributes_for :address

and

class Address
  belongs_to :hotel

And I need to save in hotels table and in addresses table from one form.

The input form is simple:

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

  <%= f.text_field :title %>
  ......other hotel fields......

  <%= f.fields_for :address do |o| %>
    <%= o.text_field :country %>
    ......other address fields......

  <% end %>
<% end %>

Hotels controller:

class HotelsController < ApplicationController
  def new
    @hotel = Hotel.new
  end

  def create
    @hotel = current_user.hotels.build(hotel_params)
    address = @hotel.address.build
    if @hotel.save      
      flash[:success] = "Hotel created!"
      redirect_to @hotel
    else
      render 'new'      
    end    
  end

But this code doesn't work.

ADD 1 Hotel_params:

  private
    def hotel_params
      params.require(:hotel).permit(:title, :stars, :room, :price)
    end

ADD 2

The main problem is I don't know how to render form properly. This ^^^ form doesn't even include adress fields (country, city etc.). But if in the line

<%= f.fields_for :address do |o| %> 

I change :address to :hotel, I get address fields in the form, but of course nothing saves in :address table in this case. I don't understand the principle of saving in 2 tables from 1 form, I'm VERY sorry, I'm new to Rails...

Answer 1

You are using wrong method for appending your child with the parent.And also it is has_one relation,so you should use build_model not model.build.Your new and create methods should be like this

class HotelsController < ApplicationController
  def new
    @hotel = Hotel.new
    @hotel.build_address #here
  end

  def create
    @hotel = current_user.hotels.build(hotel_params)

    if @hotel.save      
      flash[:success] = "Hotel created!"
      redirect_to @hotel
    else
      render 'new'      
    end    
  end

Update

Your hotel_params method should look like this

def hotel_params
   params.require(:hotel).permit(:title, :stars, :room, :price,address_attributes: [:country,:state,:city,:street])
end