feat: validate confirmed

app/controllers/locations_controller.rb

@@ -145,8 +145,7 @@ class LocationsController < ApplicationController
   def check_answers; end
 
   def update_check_answers
-    @location.confirmed = true
-    @location.save!
+    @location.confirmed!
     flash[:notice] = "#{@location.postcode} #{@location.startdate < Time.zone.now ? 'has been' : 'will be'} added to this scheme"
     redirect_to scheme_locations_path(@scheme)
   end

app/models/location.rb

@@ -7,6 +7,7 @@ class Location < ApplicationRecord
   validates :type_of_unit, on: :type_of_unit, presence: { message: I18n.t("validations.location.type_of_unit") }
   validates :mobility_type, on: :mobility_type, presence: { message: I18n.t("validations.location.mobility_standards") }
   validate :validate_startdate, on: :startdate
+  validate :validate_confirmed
   belongs_to :scheme
   has_many :lettings_logs, class_name: "LettingsLog"
   has_many :location_deactivation_periods, class_name: "LocationDeactivationPeriod"
@@ -428,10 +429,20 @@ class Location < ApplicationRecord
     end
   end
 
+  def validate_confirmed
+    if confirmed == true && incomplete?
+      self.confirmed = false
+    end
+  end
+
   def incomplete?
     [postcode, name, location_admin_district, location_code, units, type_of_unit, mobility_type, startdate].any?(&:blank?)
   end
 
+  def confirmed!
+    update!(confirmed: true)
+  end
+
 private
 
   PIO = PostcodeService.new