add geolocation search for public channels

spec/controllers/channels_controller_spec.rb

@@ -125,6 +125,13 @@ describe ChannelsController do
         get :index, {:api_key => @user.api_key, :format => 'json'}
         response.should be_successful
       end
+
+      it "searches nearby public channels" do
+        channel1 = Channel.create(name: 'channel1', latitude: 10, longitude: 10, public_flag: true)
+        channel2 = Channel.create(name: 'channel2', latitude: 60, longitude: 60, public_flag: true)
+        get :public, {api_key: @user.api_key, latitude: 59.8, longitude: 60.2, distance: 100, format: 'json'}
+        JSON.parse(response.body)['channels'][0]['name'].should eq("channel2")
+      end
     end
 
     describe "create channel" do

spec/models/channel_spec.rb

@@ -134,5 +134,17 @@ describe Channel do
       channels.count.should == 1
     end
   end
+
+  describe 'geolocation' do
+    it 'should find nearby channels' do
+      channel1 = Channel.create(latitude: 10, longitude: 10, public_flag: true)
+      channel2 = Channel.create(latitude: 60, longitude: 60, public_flag: true)
+      channel3 = Channel.create(latitude: 60, longitude: 60, public_flag: false)
+      Channel.location_search({latitude: 9.8, longitude: 10.2, distance: 100}).first.should eq(channel1)
+      Channel.location_search({latitude: 60.2, longitude: 59.8, distance: 100}).first.should eq(channel2)
+      Channel.location_search({latitude: 60.2, longitude: 59.8, distance: 100}).count.should eq(1)
+      Channel.location_search({latitude: 30.8, longitude: 30.2, distance: 100}).count.should eq(0)
+    end
+  end
 end