Nested Forms for Embedded Documents - ruby-on-rails

Question

I have the following Models
cities(id, name, geo {lng,lat})
geo(lng,lat)
Cities Model
class City
include Mongoid::Document
include Mongoid::Timestamps
field :name, type: String
field :timezone, type: String
field :slug, type: String
belongs_to :region
belongs_to :country
embeds_one :geo_location
accepts_nested_attributes_for :geo_location
end
Geo Locations Model
class GeoLocation
include Mongoid::Document
include Mongoid::Timestamps
field :lng, type: String
field :lat, type: String
embedded_in :city
end
Cities Controller
class CitiesController < ApplicationController
before_action :set_city, only: [:show, :edit, :update, :destroy]
# GET /cities
def index
#cities = City.all
end
# GET /cities/1
def show
end
# GET /cities/new
def new
#city = City.new
#regions = Region.all.asc(:name)
#countries = Country.all.asc(:name)
end
# GET /cities/1/edit
def edit
#regions = Region.all.asc(:name)
#countries = Country.all.asc(:name)
end
# POST /cities
def create
#city = City.new(city_params)
if #city.save
redirect_to #city, notice: 'City was successfully created.'
else
render action: 'new'
end
end
# PATCH/PUT /cities/1
def update
if #city.update(city_params)
redirect_to #city, notice: 'City was successfully updated.'
else
render action: 'edit'
end
end
# DELETE /cities/1
def destroy
#city.destroy
redirect_to cities_url, notice: 'City was successfully destroyed.'
end
private
# Use callbacks to share common setup or constraints between actions.
def set_city
#city = City.find(params[:id])
end
# Only allow a trusted parameter "white list" through.
def city_params
params.require(:city).permit(:name, :timezone, :region_id, :country_id, :slug, :geo_locations_attributes => [:id, :lag, :lat])
end
end
Form:
<%= form_for(#city) do |f| %>
<% if #city.errors.any? %>
<div id="error_explanation">
<h2><%= pluralize(#city.errors.count, "error") %> prohibited this city from being saved:</h2>
<ul>
<% #city.errors.full_messages.each do |msg| %>
<li><%= msg %></li>
<% end %>
</ul>
</div>
<% end %>
<div class="field">
<%= f.label :name %><br>
<%= f.text_field :name %>
</div>
<div class="field">
<%= f.label :country %><br>
<%= f.collection_select :country_id, #countries, :id, :name, :prompt => "Please Select" %>
</div>
<div class="field">
<%= f.label :region %><br>
<%= f.collection_select :region_id, #regions, :id, :name, :prompt => "Please Select" %>
</div>
<div class="field">
<%= f.label :timezone %><br>
<%= f.text_field :timezone %>
</div>
<div class="field">
<%= f.label :slug %><br>
<%= f.text_field :slug %>
</div>
<%= f.fields_for :geo_locations do |geo_location| %>
<div class="field">
<%= geo_location.label :lag %><br>
<%= geo_location.text_field :lag %>
</div>
<div class="field">
<%= geo_location.label :lat %><br>
<%= geo_location.text_field :lat %>
</div>
<% end %>
<div class="actions">
<%= f.submit %>
</div>
<% end %>
New View
<h1>New city</h1>
<%= render 'form' %>
<%= link_to 'Back', cities_path %>
The ERROR I am getting
Unpermitted parameters: geo_location

Answer 1

On controller, Replace your city_params method with this,
def city_params
params.require(:city).permit(:name, :timezone, :region_id, :country_id, :slug, :geo_location_attributes => [:id, :lag, :lat])
end
On view, Replace this "f.fields_for :geo_locations" with "f.fields_for :geo_location"
Problem in geo_locations_attributes. It should be geo_location_attributes as this is one-to-one relationship.