feat: add date model validation

app/controllers/locations_controller.rb

@@ -132,8 +132,12 @@ class LocationsController < ApplicationController
       if [day, month, year].none?(&:blank?)
         if Date.valid_date?(year.to_i, month.to_i, day.to_i)
           @location.startdate = Time.zone.local(year.to_i, month.to_i, day.to_i)
+          if @location.valid?(:startdate)
             @location.save!
             redirect_to scheme_location_check_answers_path(@scheme, @location)
+          else
+            render :availability, status: :unprocessable_entity
+          end
         else
           error_message = I18n.t("validations.location.startdate_invalid")
           @location.errors.add :startdate, error_message

app/models/location.rb

@@ -5,6 +5,7 @@ class Location < ApplicationRecord
   validate :validate_units, on: :units
   validate :validate_type_of_unit, on: :type_of_unit
   validate :validate_mobility_type, on: :mobility_type
+  validate :validate_startdate, on: :startdate
   belongs_to :scheme
   has_many :lettings_logs, class_name: "LettingsLog"
   has_many :location_deactivation_periods, class_name: "LocationDeactivationPeriod"
@@ -442,6 +443,13 @@ class Location < ApplicationRecord
     end
   end
 
+  def validate_startdate
+    unless startdate.between?(Time.zone.local(1900, 1, 1), Time.zone.local(2200, 1, 1))
+      error_message = I18n.t("validations.location.startdate_out_of_range")
+      errors.add :startdate, error_message
+    end
+  end
+
 private
 
   PIO = PostcodeService.new

config/locales/en.yml

@@ -332,6 +332,7 @@ en:
       mobility_standards: "Select the mobility standard for the majority of the units at this location"
       startdate_blank: "Enter the day, month and year when the first property became available at this location"
       startdate_invalid: "Enter a valid day, month and year"
+      startdate_out_of_range: "Availability date must be between 1900 and 2200"
       toggle_date:
         not_selected: "Select one of the options"
         invalid: "Enter a valid day, month and year"