#273 Geocoder

Jul 04, 2011 | 8 minutes | Plugins

If you need to work with geographic data, Geocoder is an excellent gem for converting addresses and coordinates, finding nearby locations, determining distances, and more!

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          bash
                
        rails g nifty:scaffold location address:string latitude:float longitude:float
rake db:migrate
bundle
        
rails g nifty:scaffold location address:string latitude:float longitude:float
rake db:migrate
bundle

          Gemfile
                
        gem 'geocoder'
        
gem 'geocoder'

          models/location.rb
                
        geocoded_by :address
after_validation :geocode, :if => :address_changed?
        
geocoded_by :address
after_validation :geocode, :if => :address_changed?

          locations_controller.rb
                
        def index
  if params[:search].present?
    @locations = Location.near(params[:search], 50, :order => :distance)
  else
    @locations = Location.all
  end
end
        
def index
  if params[:search].present?
    @locations = Location.near(params[:search], 50, :order => :distance)
  else
    @locations = Location.all
  end
end

          locations/show.html.erb
                
        <%= image_tag "http://maps.google.com/maps/api/staticmap?size=450x300&sensor=false&zoom=16&markers=#{@location.latitude}%2C#{@location.longitude}" %>

<h3>Nearby locations</h3>
<ul>
<% for location in @location.nearbys(10) %>
  <li><%= link_to location.address, location %> (<%= location.distance.round(2) %> miles)</li>
<% end %>
</ul>
        
<%= image_tag "http://maps.google.com/maps/api/staticmap?size=450x300&sensor=false&zoom=16&markers=#{@location.latitude}%2C#{@location.longitude}" %>

<h3>Nearby locations</h3>
<ul>
<% for location in @location.nearbys(10) %>
  <li><%= link_to location.address, location %> (<%= location.distance.round(2) %> miles)</li>
<% end %>
</ul>

          locations/index.html.erb
                
        <%= form_tag locations_path, :method => :get do %>
  <p>
    <%= text_field_tag :search, params[:search] %>
    <%= submit_tag "Search Near", :name => nil %>
  </p>
<% end %>
        
<%= form_tag locations_path, :method => :get do %>
  <p>
    <%= text_field_tag :search, params[:search] %>
    <%= submit_tag "Search Near", :name => nil %>
  </p>
<% end %>