rubocop corrections

app/models/application_record.rb

@@ -1,23 +1,28 @@
+# frozen_string_literal: true
+
 class ApplicationRecord < ActiveRecord::Base
   self.abstract_class = true
   def update(*args)
     result = super(*args)
-    AuditRecord.create(model: self.class, action: 'update', params: self.to_json)
+    AuditRecord.create(model: self.class, action: 'update', params: to_json)
     result
   end
+
   def save(*args)
     result = super(*args)
-    AuditRecord.create(model: self.class, action: 'save', params: self.to_json)
+    AuditRecord.create(model: self.class, action: 'save', params: to_json)
     result
   end
+
   def self.create(*args)
     result = super(*args)
     AuditRecord.create(model: self.class, action: 'create', params: result.to_json)
     result
   end
+
   def decrement!(*args)
     result = super(*args)
-    AuditRecord.create(model: self.class, action: 'decrement!', params: self.to_json)
+    AuditRecord.create(model: self.class, action: 'decrement!', params: to_json)
     result
   end
 end

app/models/audit_record.rb

@@ -1,2 +1,4 @@
+# frozen_string_literal: true
+
 class AuditRecord < ActiveRecord::Base
 end

app/models/author.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Author < ApplicationRecord
   validates :first_name, presence: true
   validates :last_name, presence: true

app/models/book.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 class Book < ApplicationRecord
   has_and_belongs_to_many :authors
 

app/models/user.rb

@@ -1,10 +1,12 @@
+# frozen_string_literal: true
+
 class User < ApplicationRecord
   has_and_belongs_to_many :books
 
   has_secure_password
   has_secure_password :recovery_password, validations: false
-  enum role: [:customer, :admin], _default: :customer
-  enum status: [:ready, :blocked], _default: :ready
+  enum role: %i[customer admin], _default: :customer
+  enum status: %i[ready blocked], _default: :ready
 
   validates :email, presence: true, uniqueness: true, format: { with: URI::MailTo::EMAIL_REGEXP }
   validates :role, presence: true
@@ -12,6 +14,6 @@ class User < ApplicationRecord
   validates :password, {
     presence: true,
     length: { minimum: 8 },
-    if: lambda{ new_record? || !password.nil? }
+    if: -> { new_record? || !password.nil? }
   }
 end