Use grape entities instead of Roar

Grape entities works better with Garner for caching. It also makes it easier to prevent keys whose values is an empty array from being returned, although not in a DRY way currently.

app/api/api.rb

@@ -40,7 +40,7 @@ def valid_api_token?
       }.to_json, 400)
     end
 
-    mount Ohana::Locations
+    mount Ohana::API
     Grape::Endpoint.send :include, LinkHeader
     add_swagger_documentation markdown: true, hide_documentation_path: true,
       hide_format: true, api_version: 'v1'

app/api/entities.rb

@@ -0,0 +1,29 @@
+module Entities
+  class Location < Grape::Entity
+    expose              :id, :unless => lambda { |o,_| o.id.blank? }
+    expose   :accessibility, :unless => lambda { |o,_| o.accessibility.blank? }
+    expose         :ask_for, :unless => lambda { |o,_| o.ask_for.blank? }
+    expose     :coordinates, :unless => lambda { |o,_| o.coordinates.blank? }
+    expose     :description, :unless => lambda { |o,_| o.description.blank? }
+    expose          :emails, :unless => lambda { |o,_| o.emails.blank? }
+    expose           :faxes, :unless => lambda { |o,_| o.faxes.blank? }
+    expose           :hours, :unless => lambda { |o,_| o.hours.blank? }
+    expose            :kind, :unless => lambda { |o,_| o.kind.blank? }
+    expose       :languages, :unless => lambda { |o,_| o.languages.blank? }
+    expose            :name, :unless => lambda { |o,_| o.name.blank? }
+    expose          :phones, :unless => lambda { |o,_| o.phones.blank? }
+    expose      :short_desc, :unless => lambda { |o,_| o.short_desc.blank? }
+    expose  :transportation, :unless => lambda { |o,_| o.transportation.blank? }
+    expose            :urls, :unless => lambda { |o,_| o.urls.blank? }
+
+    expose         :address, :using => Address::Entity, :unless => lambda { |o,_| o.address.blank? }
+    expose    :mail_address, :using => MailAddress::Entity, :unless => lambda { |o,_| o.mail_address.blank? }
+    expose        :contacts, :using => Contact::Entity, :unless => lambda { |o,_| o.contacts.blank? }
+    expose      :updated_at
+    expose    :organization, :using => Organization::Entity
+    expose        :services, :using => Service::Entity, :unless => lambda { |o,_| o.services.blank? }
+    expose             :url, :unless => lambda { |o,_| o.url.blank? }
+    expose :other_locations, :unless => lambda { |o,_| o.other_locations.blank? }
+  end
+
+end