Ensure uniqueness

app/models/carbohydrate_intake.rb

@@ -2,7 +2,7 @@ class CarbohydrateIntake < ActiveRecord::Base
   def self.short_name
     'Carbs'
   end
-  
+
   def self.fields
     [
       'weight',
@@ -12,4 +12,5 @@ def self.fields
 
   validates :datetime, presence: true
   validates :weight, presence: true, numericality: { greater_than: 0 }
+  validates_uniqueness_of :datetime
 end

app/models/glucose_measurement.rb

@@ -11,4 +11,5 @@ def self.fields
 
   validates :datetime, presence: true
   validates :value, presence: true, numericality: { greater_than: 0 }
+  validates_uniqueness_of :datetime
 end

app/models/medication_event.rb

@@ -20,4 +20,5 @@ def self.fields
   validates :datetime, presence: true
   validates :dose, presence: true, numericality: { greater_than: 0 }
   validates :insulin, presence: true, inclusion: { in: insulin_types }
+  validates_uniqueness_of :datetime
 end

app/models/physical_exercise.rb

@@ -12,4 +12,5 @@ def self.fields
 
   validates :datetime, presence: true
   validates :duration, presence: true, numericality: { greater_than: 0 }
+  validates_uniqueness_of :datetime
 end

spec/controllers/api_controller_spec.rb

@@ -75,6 +75,21 @@
           }.to_json
         }.to change(PhysicalExercise, :count).by 1
       end
+
+      it 'does not create duplicates' do
+        expect {
+          2.times do
+            post :create, data: {
+              "id":"3645",
+              "datetime":"2016-01-30T01:46:26+00:00",
+              "type":"Medication",
+              "subtype":"Lantus",
+              "category":"Bedtime",
+              "value":"14.0"
+            }
+          end
+        }.to change(MedicationEvent, :count).by 1
+      end
     end
   end
 end