Set nil to blank attributes

.rubocop.yml

@@ -19,6 +19,7 @@ Layout/EmptyLinesAroundArguments:
 Metrics/BlockLength:
   Exclude:
     - 'config/initializers/*.rb'
+    - 'spec/**/*.rb'
 
 Metrics/LineLength:
   Exclude:

app/models/membership_application.rb

@@ -6,4 +6,12 @@ class MembershipApplication < ApplicationRecord
   validates :date_of_birth, presence: true
   validates :email, presence: true
   validates :phone_number, presence: true
+
+  before_validation do
+    self.middle_name             = nil if middle_name.blank?
+    self.occupation              = nil if occupation.blank?
+    self.telegram_username       = nil if telegram_username.blank?
+    self.organization_membership = nil if organization_membership.blank?
+    self.comment                 = nil if comment.blank?
+  end
 end

spec/models/membership_application_spec.rb

@@ -15,4 +15,94 @@ RSpec.describe MembershipApplication, type: :model do
   it { is_expected.not_to validate_presence_of :telegram_username }
   it { is_expected.not_to validate_presence_of :organization_membership }
   it { is_expected.not_to validate_presence_of :comment }
+
+  describe '#middle_name' do
+    context 'when it is empty' do
+      subject { create :membership_application, middle_name: '' }
+
+      specify do
+        expect(subject.middle_name).to eq nil
+      end
+    end
+
+    context 'when it is blank' do
+      subject { create :membership_application, middle_name: '   ' }
+
+      specify do
+        expect(subject.middle_name).to eq nil
+      end
+    end
+  end
+
+  describe '#occupation' do
+    context 'when it is empty' do
+      subject { create :membership_application, occupation: '' }
+
+      specify do
+        expect(subject.occupation).to eq nil
+      end
+    end
+
+    context 'when it is blank' do
+      subject { create :membership_application, occupation: '   ' }
+
+      specify do
+        expect(subject.occupation).to eq nil
+      end
+    end
+  end
+
+  describe '#telegram_username' do
+    context 'when it is empty' do
+      subject { create :membership_application, telegram_username: '' }
+
+      specify do
+        expect(subject.telegram_username).to eq nil
+      end
+    end
+
+    context 'when it is blank' do
+      subject { create :membership_application, telegram_username: '   ' }
+
+      specify do
+        expect(subject.telegram_username).to eq nil
+      end
+    end
+  end
+
+  describe '#organization_membership' do
+    context 'when it is empty' do
+      subject { create :membership_application, organization_membership: '' }
+
+      specify do
+        expect(subject.organization_membership).to eq nil
+      end
+    end
+
+    context 'when it is blank' do
+      subject { create :membership_application, organization_membership: '   ' }
+
+      specify do
+        expect(subject.organization_membership).to eq nil
+      end
+    end
+  end
+
+  describe '#comment' do
+    context 'when it is empty' do
+      subject { create :membership_application, comment: '' }
+
+      specify do
+        expect(subject.comment).to eq nil
+      end
+    end
+
+    context 'when it is blank' do
+      subject { create :membership_application, comment: '   ' }
+
+      specify do
+        expect(subject.comment).to eq nil
+      end
+    end
+  end
 end