Refactors

app/models/blood_pressure.rb

@@ -1,4 +1,6 @@
 class BloodPressure < ActiveRecord::Base
+  include PresenterExtension
+
   def self.short_name
     'Blood Pressure'
   end

app/models/carbohydrate_intake.rb

@@ -1,4 +1,6 @@
 class CarbohydrateIntake < ActiveRecord::Base
+  include PresenterExtension
+
   def self.short_name
     'Carbs'
   end

app/models/concerns/presenter_extension.rb

@@ -0,0 +1,11 @@
+module PresenterExtension
+  extend ActiveSupport::Concern
+
+  module ClassMethods
+    def presenter
+      GlucoseMeasurementPresenter
+    end
+  end
+end
+
+ActiveRecord::Base.send(:include, PresenterExtension)

app/models/glucose_measurement.rb

@@ -1,4 +1,6 @@
 class GlucoseMeasurement < ActiveRecord::Base
+  include PresenterExtension
+
   def self.short_name
     'Glucose'
   end

app/models/glycated_haemoglobin.rb

@@ -1,4 +1,6 @@
 class GlycatedHaemoglobin < ActiveRecord::Base
+  include PresenterExtension
+
   def self.short_name
     'HbA1c'
   end

app/models/medication_event.rb

@@ -1,4 +1,6 @@
 class MedicationEvent < ActiveRecord::Base
+  include PresenterExtension
+
   def self.short_name
     'Meds'
   end

app/models/physical_exercise.rb

@@ -1,4 +1,6 @@
 class PhysicalExercise < ActiveRecord::Base
+  include PresenterExtension
+
   def self.short_name
     'Exercise'
   end

app/presenters/generic_presenter.rb

@@ -107,6 +107,10 @@ def wrapped_model
     }
   end
 
+  def short_name
+    model.class.short_name
+  end
+
   private
 
   def model

app/views/shared/_new.html.erb

@@ -1,4 +1,4 @@
-<h1>Add <%= class_name(@metric).short_name %></h1>
 <% @decorated_metric = "#{@metric.class.name}Presenter".constantize.new @metric %>
+<h1>Add <%= @decorated_metric.short_name %></h1>
 
 <%= render partial: 'shared/form' %>

spec/models/active_record_spec.rb

@@ -0,0 +1,5 @@
+describe GlucoseMeasurement, type: :model do
+  it 'knows what its presenter is' do
+    expect(described_class.presenter).to eq GlucoseMeasurementPresenter
+  end
+end

spec/presenters/glucose_measurement_presenter_spec.rb

@@ -80,6 +80,7 @@
       expect(decorated_bg.wrapped_model[:name]).to eq 'GlucoseMeasurement'
       expect(decorated_bg.wrapped_model[:underscore]).to eq 'glucose_measurement'
       expect(decorated_bg.wrapped_model[:url_friendly]).to eq 'glucose-measurement'
+      expect(decorated_bg.short_name).to eq 'Glucose'
     end
   end
 end