Added device struct Liquid attributes

Necessary to generate attributes for Liquid templates. Will soon be used during extension import of TRMNL Recipes in order to supply device information.

Milestone: minor

app/structs/device.rb

@@ -1,11 +1,14 @@
 # frozen_string_literal: true
 
 require "core"
+require "refinements/hash"
 
 module Terminus
   module Structs
     # The device struct.
     class Device < DB::Struct
+      using Refinements::Hash
+
       def asleep? at = Time.now, type: Sequel::SQLTime
         return false unless sleep_start_at && sleep_stop_at
 
@@ -33,6 +36,8 @@ module Terminus
         }
       end
 
+      def liquid_attributes = {id:, battery_percentage:, wifi_percentage:}.stringify_keys!
+
       def slug
         return Core::EMPTY_STRING unless mac_address
 

spec/app/structs/device_spec.rb

@@ -147,6 +147,16 @@ RSpec.describe Terminus::Structs::Device, :db do
     end
   end
 
+  describe "#liquid_attributes" do
+    it "answers translation" do
+      expect(device.liquid_attributes).to eq(
+        "id" => device.id,
+        "battery_percentage" => 70,
+        "wifi_percentage" => 90
+      )
+    end
+  end
+
   describe "#slug" do
     it "answers string with no colons" do
       expect(device.slug).to eq("AABBCC112233")