Cities

All the cities of the world (according to the periodically updated MaxMind database).

Data

To use this gem, you'll need the JSON data.

Download it, extract it and connect it up as follows.

$ wget https://s3-us-west-2.amazonaws.com/cities-gem/cities.tar.gz
$ tar -xzf cities.tar.gz

Cities.data_path = '/path/to/cities'

Usage

Countries are identified by their ISO 3166-1 alpha-2 codes.

cities = Cities.cities_in_country('GB')
  #=> { "abberley"=> #<City:0x000001049b9ba0>, "abberton"=> #<City:0x000001049b9b50>, ... }

mcr = cities['manchester']
  #=> #<City:0x00000102fb4ea8>

mcr.name
  #=> "Manchester"

mcr.population
  #=> 395516

mcr.latlong
  #=> [53,5, -2.216667]

The database is exhaustive and certainly stretches the definition of the word "city".

Cities.cities_in_country('GB')['buchlyvie'].population
  #=> 448

Countries

This gem was designed as an extension to the Countries gem. Installing Cities adds two new instance methods to the Country class.

us = Country.search('US')
  #=> #<Country:0x000001020cf5f0>

us.cities?
  #=> true

us.cities
  #=> { "abanda" => #<Cities::City:0x00000114b34a38>, ...  }

Credits

Provided under an MIT license by Joe Corcoran. Thanks to hexorx for the countries gem that brought this idea about.