Rails Model Association with form - ruby-on-rails

Question

I am trying to achieve this:
It has a model called Customer that has details of the customers name
(first, middle and last) and telephone numbers (mobile and landline).
It has a model called Address that is linked to Customer. This model
will have details for a customers address (a number of address lines,
a country and a post/zip code).
A customers controller that supports two pages. The first will list
all customers in the database along with their associated address.
The second will display a form for the entry of a new customer along
with their address and allow for the creation of a new customer and
address record. It should be possible to move from either page to the
other without having to enter an URL in the browser navigation bar.
A number of points of note about this are as follows...
This is my code:
Migration:
class CreateAddresses < ActiveRecord::Migration
def change
create_table :addresses do |t|
t.string :address_line1
t.string :address_line2
t.string :address_line3
t.string :city
t.string :county_province
t.string :zip_or_postcode
t.string :country
t.string :customer_id
t.timestamps null: false
end
create_table :customers do |t|
t.string :first_name
t.string :middle_name
t.string :last_name
t.integer :mobile_number
t.integer :landline_number
t.timestamps null: false
end
end
end
Model:
class Address < ActiveRecord::Base
end
class Customer < ActiveRecord::Base
has_one :address
end
Form:
<%= form_for([#address,#customer]) do |f| %>
<% if #customer.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(#customer.errors.count, "error") %> prohibited this customer from being saved:</h2>
<ul>
<% #customer.errors.full_messages.each do |message| %>
<li><%= message %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="field">
<%= f.label :first_name %><br>
<%= f.text_field :first_name %>
</div>
<div class="field">
<%= f.label :middle_name %><br>
<%= f.text_field :middle_name %>
</div>
<div class="field">
<%= f.label :last_name %><br>
<%= f.text_field :last_name %>
</div>
<div class="field">
<%= f.label :mobile_number %><br>
<%= f.number_field :mobile_number %>
</div>
<div class="field">
<%= f.label :landline_number %><br>
<%= f.number_field :landline_number %>
</div>
<div class="field">
<%= f.label :address_line1 %><br>
<%= f.text_field :address_line1 %>
</div>
<div class="field">
<%= f.label :address_line2 %><br>
<%= f.text_field :address_line2 %>
</div>
<div class="field">
<%= f.label :address_line3 %><br>
<%= f.text_field :address_line3 %>
</div>
<div class="field">
<%= f.label :city %><br>
<%= f.text_field :city %>
</div>
<div class="field">
<%= f.label :county_province %><br>
<%= f.text_field :county_province %>
</div>
<div class="field">
<%= f.label :zip_or_postcode %><br>
<%= f.text_field :zip_or_postcode %>
</div>
<div class="field">
<%= f.label :country %><br>
<%= f.text_field :country %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
Routes:
resources :addresses do
resources :customers
end
resources :customers do
resources :addresses
end
I haven't changed anything in my both controllers.
I am getting this error: undefined method `address_line1' for #
I don't understand where i am wrong. Any help? :( please
Schema:
ActiveRecord::Schema.define(version: 20150722160725) do
create_table "addresses", force: :cascade do |t|
t.string "customer_id"
t.string "address_line1"
t.string "address_line2"
t.string "address_line3"
t.string "city"
t.string "county_province"
t.string "zip_or_postcode"
t.string "country"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
add_index "addresses", ["customer_id"], name: "index_addresses_on_customer_id"
create_table "customers", force: :cascade do |t|
t.string "first_name"
t.string "middle_name"
t.string "last_name"
t.integer "mobile_number"
t.integer "landline_number"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
end
end