Validate swiss zip_code in wizards(#1452)

app/models/wizards/steps/signup/person_fields.rb

@@ -26,6 +26,8 @@ class Wizards::Steps::Signup::PersonFields < Wizards::Step
   validates :gender, :street, :housenumber, :town, :zip_code,
     :country, presence: true
 
+  validate :assert_is_valid_swiss_post_code
+
   def initialize(...)
     super
 
@@ -48,4 +50,12 @@ def initialize(...)
       self.country ||= Settings.addresses.imported_countries.to_a.first
     end
   end
+
+  private
+
+  def assert_is_valid_swiss_post_code
+    if zip_code.present? && Countries.swiss?(country) && !zip_code.to_s.match(/\A\d{4}\z/)
+      errors.add(:zip_code)
+    end
+  end
 end

spec/models/wizards/steps/signup/person_fields_spec.rb

@@ -58,6 +58,19 @@
         expect(form.errors.full_messages).to eq ["Person muss 6 Jahre oder älter sein"]
       end
     end
+
+    describe "zip_code" do
+      it "validates swiss zip code format" do
+        form.attributes = required_attrs.merge(zip_code: "123")
+        expect(form).not_to be_valid
+        expect(form.errors.full_messages).to eq ["PLZ ist nicht gültig"]
+      end
+
+      it "accepts any format for non-swiss countries" do
+        form.attributes = required_attrs.merge(zip_code: "123", country: "DE")
+        expect(form).to be_valid
+      end
+    end
   end
 
   it "sets country default to ch" do