Geocoder with One to Many realtionship Ruby on Rails - ruby-on-rails

Question

I have two models in my Rails app which form a one_to_many relationship. The first model, store, represents a brick and mortar store and has latitude and longitude columns which are being geocoded correctly using the 'geocoder' gem and an address column. The store has_many products. The product has_one store. I would like to return the index of products based on proximity to an address which the user inputs in the search form. Here are the relevant parts of my code as well as my attempt at implementing the search:
in schema.rb:
create_table "products", force: true do |t|
t.string "title"
...
t.integer "store_id"
end
create_table "stores", force: true do |t|
...
t.string "business_address"
t.float "latitude"
t.float "longitude"
end
in store.rb
class Store < ActiveRecord::Base
has_many :products
geocoded_by :business_address
after_validation :geocode, :if => :business_address_changed?
end
in product.rb
class Offer < ActiveRecord::Base
belongs_to :store
end
in views/products/search.html.erb
...
<%= form_tag products_path, :method => 'get' do %>
<p>
Find products near<br />
<%= text_field_tag :custom_address, params[:custom_address] %><br />
</p>
<p>
<%= submit_tag "Search", :name => nil %>
</p>
<% end %>
in products_controller.rb
def index
#products = Store.near(params[:custom_address], 100, order: :distance, :select => "products.*")
end
The above index method generates a
ActiveRecord::StatementInvalid in Products#index
error
I am not sure how to continue. Obviously there is a problem with the way I am using the near method and :select but I can't wrap my head around it. How can I return the products sorted by distance?
I am using MySQL as the database adapter; I have heard of issues due to a lack of trig functions with SQLite.

Answer 1

I got my code working properly by using the following:
I added an attr_accessor in the Product model:
class Product < ActiveRecord::Base
belongs_to :store
attr_accessor :distance_to_user
end
And I changed the index method:
def index
#products = []
if params[:custom_address]
geocoded_stores = (Stores.near(params[:custom_address], 100,))
geocoded_stores.each do |s|
s.products.each do |product|
product.distance_to_user = s.distance
#products << product
end
end
else
#products = Product.all
end
end