Make Event's location accessible from Liquid templates.

app/models/event.rb

@@ -117,4 +117,8 @@ class EventDrop
       @object.created_at
     }
   end
+
+  def _location_
+    @object.location
+  end
 end

lib/location.rb

@@ -1,6 +1,10 @@
+require 'liquid'
+
 Location = Struct.new(:lat, :lng, :radius, :speed, :course)
 
 class Location
+  include LiquidDroppable
+
   protected :[]=
 
   def initialize(data = {})
@@ -86,3 +90,13 @@ class Location
     end
   end
 end
+
+class LocationDrop
+  KEYS = Location.members.map(&:to_s).concat(%w[latitude longitude])
+
+  def before_method(key)
+    if KEYS.include?(key)
+      @object.__send__(key)
+    end
+  end
+end

spec/lib/location_spec.rb

@@ -53,4 +53,16 @@ describe Location do
     expect(Location.new(lat: 2, radius: 1).present?).to be_falsy
     expect(Location.new(lng: 3, radius: 1).present?).to be_falsy
   end
+
+  it "is droppable" do
+    {
+      '{{location.lat}}' => '2.0',
+      '{{location.latitude}}' => '2.0',
+      '{{location.lng}}' => '3.0',
+      '{{location.longitude}}' => '3.0',
+    }.each { |template, result|
+      expect(Liquid::Template.parse(template).render('location' => location.to_liquid)).to eq(result),
+        "expected #{template.inspect} to expand to #{result.inspect}"
+    }
+  end
 end

spec/models/event_spec.rb

@@ -174,6 +174,8 @@ describe EventDrop do
       'title' => 'some title',
       'url' => 'http://some.site.example.org/',
     }
+    @event.lat = 2
+    @event.lng = 3
     @event.save!
   end
 
@@ -210,4 +212,9 @@ describe EventDrop do
     t = '{{created_at | date:"%FT%T%z" }}'
     interpolate(t, @event).should eq(@event.created_at.strftime("%FT%T%z"))
   end
+
+  it 'should have _location_' do
+    t = '{{_location_.lat}},{{_location_.lng}}'
+    interpolate(t, @event).should eq("2.0,3.0")
+  end
 end