convertir el timestamp en una fecha

app/controllers/readings_controller.rb

@@ -6,6 +6,11 @@ class ReadingsController < ActionController::API
 
   # @see {https://docutopia.tupale.co/sutty:nodemecu:api}
   def create
+    if reading_params.empty?
+      head :ok
+      return
+    end
+
     Reading.transaction do
       reading = raspberry.readings.build reading_params
       reading.id = params[:transaction_uuid]
@@ -52,6 +57,8 @@ class ReadingsController < ActionController::API
   def sensor_params(sensor)
     sensor.permit(:timestamp, :type, :value, :unit, :error).tap do |p|
       p[:local_type] = p.delete :type
+      p[:timestamp] = Time.at p[:timestamp]
+    rescue TypeError
     end
   end
 end

app/models/arduino.rb

@@ -4,4 +4,6 @@ class Arduino < ApplicationRecord
   belongs_to :raspberry
   belongs_to :reading
   has_many :sensors
+
+  validates_presence_of :local_id
 end

app/models/raspberry.rb

@@ -3,4 +3,7 @@
 class Raspberry < ApplicationRecord
   has_many :readings
   has_many :arduinos
+
+  validates_presence_of :name
+  validates_uniqueness_of :name
 end

app/models/sensor.rb

@@ -2,4 +2,6 @@
 
 class Sensor < ApplicationRecord
   belongs_to :arduino
+
+  validates_presence_of :timestamp, :local_type, :value, :unit
 end