Use find insted of select

app/models/derived_variables/case_log_variables.rb

@@ -84,7 +84,7 @@ module DerivedVariables::CaseLogVariables
         self.la = location.county
         self.postcode_full = location.postcode
         self.unittype_sh = TYPE_OF_UNIT_MAP[location.type_of_unit]
-        self.builtype = form.questions.find { |x| x.id == "builtype" }.answer_options.select { |_key, value| value["value"] == location.type_of_building }.keys.first
+        self.builtype = form.questions.find { |x| x.id == "builtype" }.answer_options.find { |_key, value| value["value"] == location.type_of_building }.first
         wheelchair_adaptation_map = { 1 => 1, 0 => 2 }
         self.wchair = wheelchair_adaptation_map[location.wheelchair_adaptation.to_i]
       end

db/seeds.rb

@@ -115,7 +115,7 @@ unless Rails.env.test?
       postcode: "CU193AA",
       name: "Rectory Road",
       type_of_unit: 4,
-      type_of_building: "Purpose-built",
+      type_of_building: "Purpose built",
       county: "Mid Sussex",
       wheelchair_adaptation: 0,
     )

spec/factories/location.rb

@@ -4,7 +4,7 @@ FactoryBot.define do
     postcode { Faker::Address.postcode.delete(" ") }
     name { Faker::Address.street_name }
     type_of_unit { Faker::Number.within(range: 1..6) }
-    type_of_building { Faker::Lorem.word }
+    type_of_building { "Purpose built" }
     wheelchair_adaptation { 0 }
     county { Faker::Address.state }
     scheme