Add new fields to signature

- Add :date_of_birth and :postal_code to Signature to allow send these
  fields to CustomCensusAPI

- Add new model presence validates: Only validate :date_of_birth and
  :postal_code presence when the application has configured Remote Census
  and their alias fields has values.

app/models/signature.rb

@@ -3,6 +3,8 @@ class Signature < ApplicationRecord
   belongs_to :user
 
   validates :document_number, presence: true
+  validates :date_of_birth, presence: true, if: -> { Setting.force_presence_date_of_birth? }
+  validates :postal_code, presence: true, if: -> { Setting.force_presence_postal_code? }
   validates :signature_sheet, presence: true
 
   scope :verified,   -> { where(verified: true) }

db/migrate/20190429214633_add_date_of_birth_to_signatures.rb

@@ -0,0 +1,5 @@
+class AddDateOfBirthToSignatures < ActiveRecord::Migration
+  def change
+    add_column :signatures, :date_of_birth, :date
+  end
+end

db/migrate/20190430003908_add_postal_code_to_signatures.rb

@@ -0,0 +1,5 @@
+class AddPostalCodeToSignatures < ActiveRecord::Migration
+  def change
+    add_column :signatures, :postal_code, :string
+  end
+end

db/schema.rb

@@ -1476,6 +1476,8 @@ ActiveRecord::Schema.define(version: 20190607160900) do
     t.boolean  "verified",           default: false
     t.datetime "created_at"
     t.datetime "updated_at"
+    t.date     "date_of_birth"
+    t.string   "postal_code"
   end
 
   create_table "site_customization_content_blocks", force: :cascade do |t|

spec/models/signature_spec.rb

@@ -28,6 +28,48 @@ describe Signature do
 
   end
 
+  describe "custom validations" do
+
+    let(:signature) { build(:signature,
+                            document_number: "12345678Z",
+                            date_of_birth: "31/12/1980",
+                            postal_code: "28013") }
+
+    before do
+      Setting["feature.remote_census"] = true
+      Setting["remote_census.request.date_of_birth"] = "some.value"
+      Setting["remote_census.request.postal_code"] = "some.value"
+    end
+
+    after do
+      Setting["feature.remote_census"] = nil
+      Setting["remote_census.request.date_of_birth"] = nil
+      Setting["remote_census.request.postal_code"] = nil
+    end
+
+    it "is valid" do
+      expect(signature).to be_valid
+    end
+
+    it "is not valid without a document number" do
+      signature.document_number = nil
+      expect(signature).not_to be_valid
+    end
+
+    it "is not valid without a date of birth" do
+      signature.date_of_birth = nil
+
+      expect(signature).not_to be_valid
+    end
+
+    it "is not valid without a postal_code" do
+      signature.postal_code = nil
+
+      expect(signature).not_to be_valid
+    end
+
+   end
+
   describe "#clean_document_number" do
     it "removes non alphanumeric characters" do
       signature = create(:signature, document_number: "123-[;,9]")