Implement measurements create/destroy and index listing

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/controllers/measurements_controller.rb

@@ -1,7 +1,13 @@
 class MeasurementsController < ApplicationController
+  before_action except: :index do
+    raise AccessForbidden unless current_user.at_least(:active)
+  end
+
   def index
-    @measurements = []
-    #@measurements = current_user.units.ordered.includes(:base, :subunits)
+    readouts = current_user.readouts.includes(:quantity, :unit).order(created_at: :desc)
+    @measurements = readouts.group_by(&:created_at).map do |created_at, grouped|
+      Measurement.new(created_at: created_at, readouts: grouped)
+    end
   end
 
   def new
@@ -9,8 +15,33 @@ class MeasurementsController < ApplicationController
   end
 
   def create
+    timestamp = Time.current
+    @readouts = readout_params.map do |rp|
+      r = current_user.readouts.new(rp)
+      r.created_at = timestamp
+      r
+    end
+
+    if @readouts.all?(&:valid?)
+      Readout.transaction { @readouts.each(&:save!) }
+      @measurement = Measurement.new(readouts: @readouts, created_at: timestamp)
+      flash.now[:notice] = t('.success')
+    else
+      render :new, status: :unprocessable_entity
+    end
   end
 
   def destroy
+    @measurement = Measurement.new(id: params[:id].to_i,
+                                   created_at: Time.at(params[:id].to_i))
+    current_user.readouts.where(created_at: @measurement.created_at).delete_all
+    @measurements_empty = current_user.readouts.empty?
+    flash.now[:notice] = t('.success')
+  end
+
+  private
+
+  def readout_params
+    params.require(:readouts).map { |r| r.permit(:quantity_id, :value, :unit_id) }
   end
 end