Allow any configuration of required fields

- Add the methods "parse_date_of_birth" and "parse_postal_code"
  to recover the correct position of their values depending on the
  configuration of the remote census.

app/models/signature_sheet.rb

@@ -23,8 +23,8 @@ class SignatureSheet < ApplicationRecord
   def verify_signatures
     parsed_required_fields_to_verify_groups.each do |required_fields_to_verify|
       document_number = required_fields_to_verify[0]
-      date_of_birth = required_fields_to_verify[1]
-      postal_code = required_fields_to_verify[2]
+      date_of_birth = parse_date_of_birth(required_fields_to_verify)
+      postal_code = parse_postal_code(required_fields_to_verify)
 
       signature = signatures.where(document_number: document_number,
                                    date_of_birth: date_of_birth,
@@ -41,4 +41,21 @@ class SignatureSheet < ApplicationRecord
   def signable_found
     errors.add(:signable_id, :not_found) if errors.messages[:signable].present?
   end
+
+  private
+
+    def parse_date_of_birth(required_fields_to_verify)
+      return required_fields_to_verify[1] if Setting.force_presence_date_of_birth?
+      nil
+    end
+
+    def parse_postal_code(required_fields_to_verify)
+      if Setting.force_presence_date_of_birth? && Setting.force_presence_postal_code?
+        return required_fields_to_verify[2]
+      elsif Setting.force_presence_postal_code?
+        return required_fields_to_verify[1]
+      else
+        return nil
+      end
+    end
 end

spec/models/signature_sheet_spec.rb

@@ -118,6 +118,24 @@ describe SignatureSheet do
         Setting["remote_census.request.date_of_birth"] = nil
       end
 
+      it "creates signatures for each group with document_number and postal_code" do
+        Setting["remote_census.request.postal_code"] = "some.value"
+
+        required_fields_to_verify = "123A, 28001; 456B, 28002"
+        signature_sheet = create(:signature_sheet, required_fields_to_verify: required_fields_to_verify)
+        signature_sheet.verify_signatures
+
+        expect(Signature.count).to eq(2)
+        expect(Signature.first.document_number).to eq("123A")
+        expect(Signature.first.date_of_birth).to eq(nil)
+        expect(Signature.first.postal_code).to eq("28001")
+        expect(Signature.last.document_number).to eq("456B")
+        expect(Signature.last.date_of_birth).to eq(nil)
+        expect(Signature.last.postal_code).to eq("28002")
+
+        Setting["remote_census.request.postal_code"] = nil
+      end
+
       it "creates signatures for each group with document_number, postal_code and date_of_birth" do
         Setting["remote_census.request.date_of_birth"] = "some.value"
         Setting["remote_census.request.postal_code"] = "some.value"