Breefield

class Event < ActiveRecord::Base
  has_one :location, as: :located, dependent: :destroy
  accepts_nested_attributes_for :location
end

Breefield

Event.create(name: 'Coffee Party', location_attributes: {address: '3126 16th St. San Francisco, CA 94103'})
  # (0.2ms)  begin transaction
  # SQL (2.8ms)  INSERT INTO "events" ("created_at", "name", "updated_at") VALUES (?, ?, ?)  [["created_at", Fri, 22 Nov 2013 19:09:51 UTC +00:00], ["name", "Coffee Party"], ["updated_at", Fri, 22 Nov 2013 19:09:51 UTC +00:00]]
  # SQL (0.3ms)  INSERT INTO "locations" ("address", "created_at", "latitude", "located_id", "located_type", "longitude", "updated_at") VALUES (?, ?, ?, ?, ?, ?, ?)  [["address", "3126 16th St. San Francisco, CA 94103"], ["created_at", Fri, 22 Nov 2013 19:09:51 UTC +00:00], ["latitude", 37.7648968], ["located_id", 2], ["located_type", "Event"], ["longitude", -122.4225344], ["updated_at", Fri, 22 Nov 2013 19:09:51 UTC +00:00]]
  # (2.2ms)  commit transaction
  # <Event id: 2, name: "Coffee Party", created_at: "2013-11-22 19:09:51", updated_at: "2013-11-22 19:09:51">

Breefield

class Location < ActiveRecord::Base
  belongs_to :located, :polymorphic => true
  geocoded_by :address
  before_validation :geocode, :if => :changed?
end

Breefield

Location.near('San Francisco', 50).each { |location| puts location.located }

Breefield

Location.near('San Francisco', 50).each { |location| puts location.located }

Breefield

Location.near('San Francisco', 50)
  .includes(:owner)
# Event Load (0.2ms)  SELECT "events".* FROM "events" WHERE "events"."id" IN (3, 1, 2)
# Venue Load (0.3ms)  SELECT "venues".* FROM "venues" WHERE "venues"."id" IN (1, 2, 3)

Breefield

class Location < ActiveRecord::Base
  # ...
  belongs_to :event, :foreign_key => :located_id, :foreign_type => 'Event'
  # ...
end

Breefield

Location.near('San Francisco', 50)
  .where(located_type: 'Event')   # Filter other polymorphic models out
  .joins(:event)                  # ...JOIN events ON...
  .where('events.price <= ?', 20) # Filter events by their price
  .includes(:event)               # Avoid N+1

Breefield

reorder('events.price ASC, distance ASC')

Breefield

Location.near('San Francisco', 50)
  .where(located_type: 'Event')   # Filter other polymorphic models out
  .joins(:event)                  # ...JOIN events ON...
  .where('events.price <= ?', 20) # Filter events by their price
  .includes(:event)               # Avoid N+1
  .reorder('events.price ASC, distance ASC')