dm-geokit

A mixin for Datamapper models that enables geographic functionality.

• Search for content via DataMapper-style query methods, e.g. Location.all(:address.near => => 'Portland, OR', :distance => 5.mi)
• Sort by distance easily: Location.all(:address.near => => 'Portland, OR', :distance => 5.mi, :order => [:address_distance.desc])
• Ability to specify multiple fields that are geocodable (mostly)

Usage

Basic Class Definition:

class Location
  include DataMapper::Resource
  include DataMapper::GeoKit
  property :id, Serial
  has_geographic_location :address
end

This will automatically generate fields and methods for use with the DM Object, prefixed with the field name specified. Since the above example used the field :address, the following fields would be generated:

• address_street_address
• address_city
• address_state
• address_zip
• address_country_code
• address_full_address
• address_lat
• address_lng

You can either reference those fields directly, or use the proxy object returned by calling .address on your object:

l = Location.all(:address.near => {:origin => 'Portland, OR', :distance => 5.mi})

l.each do |loc|
  puts loc.address # .to_s yields string representation of full address, e.g. "12345 My St. Portland, OR USA"
  puts loc.address.inspect # the proxy object, GeographicLocation, with matching methods for each property
  puts loc.address.street_address # getting the street_address from the proxy object
  puts loc.address_street_address # directly access the SQL column
end

The GeographicLocation proxy object is a convenience to allow you to compare and sort results in Ruby.

Requirements

• geokit >= 1.5.0
• dm-core >= 1.0.2
• dm-aggregates >= 1.0.2