ID changed to NULL on update - Rails 4 - ruby-on-rails

Question

I have a landlord and landlord_address model. When a new landlord_address is created, the landlord_id is saved to the table. For some reason, when I edit a landlord_address the landlord_id is changed to NULL.
Models:
class Landlord < ActiveRecord::Base
has_many :landlord_addresses, dependent: :destroy
belongs_to :listing_agent, class_name: 'Agent'
end
class LandlordAddress < ActiveRecord::Base
belongs_to :landlord
has_many :landlord_companies, dependent: :destroy
end
Landlord Addresses Controller:
module Matrix
class LandlordAddressesController < ApplicationController
before_action :set_landlord_address, only: [:show, :edit, :update, :destroy]
# GET /landlord_addresses
# GET /landlord_addresses.json
def index
#landlord = Landlord.find(params[:landlord_id])
#landlord_addresses = #landlord.landlord_addresses.order(address_line_one: :asc)
end
# GET /landlord_addresses/1
# GET /landlord_addresses/1.json
def show
end
# GET /landlord_addresses/new
def new
#landlord_address = LandlordAddress.new
#landlord = Landlord.find(params[:landlord_id])
end
# GET /landlord_addresses/1/edit
def edit
end
# POST /landlord_addresses
# POST /landlord_addresses.json
def create
#landlord_address = LandlordAddress.new(landlord_address_params)
respond_to do |format|
if #landlord_address.save
format.html { redirect_to matrix_landlord_landlord_addresses_path, notice: 'Landlord address was successfully created.' }
format.json { render :show, status: :created, location: #landlord_address }
else
format.html { render :new }
format.json { render json: #landlord_address.errors, status: :unprocessable_entity }
end
end
end
# PATCH/PUT /landlord_addresses/1
# PATCH/PUT /landlord_addresses/1.json
def update
respond_to do |format|
if #landlord_address.update(landlord_address_params)
format.html { redirect_to matrix_landlord_landlord_addresses_path, notice: 'Landlord address was successfully updated.' }
format.json { render :show, status: :ok, location: #landlord_address }
else
format.html { render :edit }
format.json { render json: #landlord_address.errors, status: :unprocessable_entity }
end
end
end
# DELETE /landlord_addresses/1
# DELETE /landlord_addresses/1.json
def destroy
#landlord_address.destroy
respond_to do |format|
format.html { redirect_to landlord_addresses_url, notice: 'Landlord address was successfully destroyed.' }
format.json { head :no_content }
end
end
private
# Use callbacks to share common setup or constraints between actions.
def set_landlord_address
#landlord_address = LandlordAddress.find(params[:id])
end
# Never trust parameters from the scary internet, only allow the white list through.
def landlord_address_params
params.require(:landlord_address).permit(:address_line_one, :address_line_two, :city, :state, :zip, :super_name, :super_number, :landlord_id, :latitude, :longitude)
end
end
end
Landlord Addresses _form:
<div class="feedback-container">
<%= form_for [:matrix, #landlord_address] do |f| %>
<% if #landlord_address.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(#landlord_address.errors.count, "error") %> prohibited this landlord_address from being saved:</h2>
<ul>
<% #landlord_address.errors.full_messages.each do |message| %>
<li><%= message %></li>
<% end %>
/ul>
</div>
<% end %>
<div id="form-map"></div>
<input id="pac-input" class="controls" type="text"
placeholder="Enter a location">
<div id="type-selector" class="controls">
<input type="radio" name="type" id="changetype-all" checked="checked">
<label for="changetype-all">All</label>
</div>
<div class="field">
<%= f.label :address, class: "general-text-label" %>
<%= f.text_field :address_line_one, class: "general-text-field map-autocomplete-address" %>
<%= f.hidden_field :latitude, class: "map-autocomplete-latitude" %>
<%= f.hidden_field :longitude, class: "map-autocomplete-longitude" %>
</div>
<div class="field">
<%= f.label :super_name, class: "general-text-label" %><br>
<%= f.text_field :super_name, class: "general-text-field" %>
</div>
<div class="field">
<%= f.label :super_number, class: "general-text-label" %><br>
<%= f.text_field :super_number, class: "general-text-field" %>
</div>
<div class="field">
<%= f.hidden_field :landlord_id, :value => params[:landlord_id] %>
</div><br>
<div class="actions">
<%= f.submit "Submit", class: "btn btn-black btn-4x" %>
</div>
<% end %>
</div>
Routes:
namespace :matrix do
resources :landlords, shallow: true do
resources :landlord_addresses do
resources :landlord_companies
end
end
end
New Error:

Answer 1

This part
<%= f.hidden_field :landlord_id, :value => params[:landlord_id] %>
will be your issue. When params[:landlord_id] is nil your record will be updated to null.
You should change it to
<%= f.hidden_field :landlord_id, :value => #landlord_address.landlord_id || #landlord.id %>
or some thing else.

Answer 2

Your route is nested, You dnt need to assign in hidden field. You can do it in the controller, passing params.
Form:
Remove hidden field, we are assigning it in the controller!
<div class="field">
<%= f.hidden_field :landlord_id, :value => params[:landlord_id] %>
</div><br>
Controller:
# POST /landlord_addresses
# POST /landlord_addresses.json
def create
#landlord_address = LandlordAddress.new(landlord_address_params)
# add this line here!
#landlord_address.landlord_id = params[:landlord_id]
respond_to do |format|
if #landlord_address.save
format.html { redirect_to matrix_landlord_landlord_addresses_path, notice: 'Landlord address was successfully created.' }
format.json { render :show, status: :created, location: #landlord_address }
else
format.html { render :new }
format.json { render json: #landlord_address.errors, status: :unprocessable_entity }
end
end
end
private
#ALSO REMOVE `:landlord_id` from
def landlord_address_params
params.require(:landlord_address).permit(:address_line_one, :address_line_two, :city, :state, :zip, :super_name, :super_number, :latitude, :longitude)
end