Postgresql error when reverse geocoding in Ruby on Rails - ruby-on-rails

Question

I am having an issue trying to do a bulk reverse geocode using the geocoder rails gem: https://github.com/alexreisner/geocoder
I have the following models:
class School < ActiveRecord::Base
reverse_geocoded_by :latitude, :longitude
has_one :address
end
and
class Address < ActiveRecord::Base
belongs_to :school
end
And the following migrations:
class CreateSchools < ActiveRecord::Migration
def change
create_table :schools do |t|
t.string :name
t.integer :address_id
t.timestamps null: false
end
end
end
and
class CreateAddresses < ActiveRecord::Migration
def change
create_table :addresses do |t|
t.string :line_1
t.string :line_2
t.string :line_3
t.string :city
t.string :region
t.string :country
t.string :code
t.timestamps null: false
end
end
end
and when I run the following line:
rake geocode:all CLASS=School REVERSE=true SLEEP=0.5
I get this error:
ActiveRecord::StatementInvalid: PG::UndefinedColumn: ERROR: column schools.address does not exist
LINE 1: SELECT "schools".* FROM "schools" WHERE (schools.address IS...
^
: SELECT "schools".* FROM "schools" WHERE (schools.address IS NULL) ORDER BY "schools"."id" ASC LIMIT 1000
I know the readme says this:
"For geocoding your model must provide a method that returns an
address. This can be a single attribute, but it can also be a method
that returns a string assembled from different attributes (eg: city,
state, and country)."
I took that to mean I needed either a method on the School model or the attribute on the school table and I opted for the latter but I'm not sure what I'm missing.
Thanks!

Answer 1

The problem is that the reverse-geocoding rake task starts by loading all the records with no address column yet. It uses this scope:
scope :not_reverse_geocoded, lambda {
where("#{table_name}.#{geocoder_options[:fetched_address]} IS NULL")
}
The problem is you don't have any column on schools you could use. Instead, you should move the reverse_geocoded_by declaration to the Address class. You will also need to either add an addresses.address column or do something like this:
reverse_geocoded_by :latitude, :longitude, fetched_address: :line_1
Also you don't seem to have columns for latitude and longitude. And of course those should be on Address too, not School. After all, if a school can have several addresses, which one is its lonlat?