infer renttype value from rent_type

app/constants/db_enums.rb

@@ -725,4 +725,12 @@ module DbEnums
       "A spouse / civil partner of a UK Armed Forces member who has separated or been bereaved within the last 2 years" => 5,
     }
   end
+
+  def self.renttype
+    {
+      "Social Rent" => 1,
+      "Affordable Rent" => 2,
+      "Intermediate Rent" => 3,
+    }
+  end
 end

app/models/case_log.rb

@@ -104,8 +104,9 @@ class CaseLog < ApplicationRecord
   enum unitletas: DbEnums.unitletas, _suffix: true
   enum builtype: DbEnums.builtype, _suffix: true
   enum incref: DbEnums.polar, _suffix: true
+  enum renttype: DbEnums.renttype, _suffix: true
 
-  AUTOGENERATED_FIELDS = %w[id status created_at updated_at discarded_at].freeze
+  AUTOGENERATED_FIELDS = %w[id status created_at updated_at discarded_at renttype].freeze
   OPTIONAL_FIELDS = %w[do_you_know_the_postcode
                        do_you_know_the_local_authority
                        first_time_property_let_as_social_housing].freeze
@@ -197,6 +198,18 @@ class CaseLog < ApplicationRecord
     end
   end
 
+  def renttype
+    rent_type_mapping = {
+      "Social Rent" => "Social Rent",
+      "Affordable Rent" => "Affordable Rent",
+      "London Affordable Rent" => "Affordable Rent",
+      "Rent To Buy" => "Intermediate Rent",
+      "London Living Rent" => "Intermediate Rent",
+      "Other Intermediate Rent Product" => "Intermediate Rent",
+    }
+    rent_type_mapping[rent_type]
+  end
+
 private
 
   def update_status!

db/schema.rb

@@ -166,6 +166,7 @@ ActiveRecord::Schema.define(version: 2021_11_30_090246) do
     t.integer "unitletas"
     t.integer "builtype"
     t.datetime "property_void_date"
+
     t.integer "renttype"
     t.index ["discarded_at"], name: "index_case_logs_on_discarded_at"
   end

spec/factories/case_log.rb

@@ -135,7 +135,6 @@ FactoryBot.define do
       armedforces { 1 }
       builtype { 1 }
       unitletas { 2 }
-      renttype { 1 }
     end
     created_at { Time.zone.now }
     updated_at { Time.zone.now }

spec/models/case_log_spec.rb

@@ -600,4 +600,12 @@ RSpec.describe Form, type: :model do
       expect(case_log.weekly_net_income).to eq(417)
     end
   end
+
+  describe "inferred fields" do
+    let!(:case_log) { FactoryBot.create(:case_log, rent_type: "London Affordable Rent") }
+
+    it "sets renttype correctly" do
+      expect(case_log.renttype).to eq("Affordable Rent")
+    end
+  end
 end