End of day commit

app/services/ability.rb

@@ -0,0 +1,11 @@
+class Ability
+  include CanCan::Ability
+  def initialize(settings)
+    settings ||= SupplierEmployeesSettings.new(Supplier.new).for_employee(nil)
+    if settings.manager?
+      can :manage, :all
+    else
+      can :read, :all
+    end
+  end
+end

app/services/new_supplier.rb

@@ -0,0 +1,46 @@
+class NewSupplier
+  include ActiveAttr::Model
+  attr_accessor :current_employee
+
+  attribute :supplier_name
+  attribute :email
+  attribute :password
+  attribute :password_confirmation
+
+  without_current_supplier = { unless: 'current_employee.present?' }
+  validates :supplier_name, presence: true
+  validates :email, email: without_current_supplier
+  validates :password, presence: without_current_supplier, confirmation: without_current_supplier
+
+  validate :supplier_name_uniqueness
+  validate :employee_uniqueness
+
+  def save
+    if valid?
+      persist!
+      true
+    else
+      false
+    end
+  end
+
+  private
+
+  def persist!
+    employee = Employee.new unconfirmed_email: email, password: password, password_confirmation: password_confirmation
+    raise "Cannot create employee with #{attributes.inspect}" unless employee.save
+    supplier = Supplier.create name: supplier_name
+    supplier.add_manager employee
+  end
+
+  def employee_uniqueness
+    return if current_employee.present?
+    errors.add :email, :taken if Employee.count_by_email(email) > 0
+  end
+
+  def supplier_name_uniqueness
+    return unless current_employee.present? and supplier_name.present?
+    current_suppliers = current_employee.suppliers
+    errors.add :base, 'You already have a supplier with that name' if current_suppliers.map(&:name).include? supplier_name
+  end
+end

app/services/null_object.rb

@@ -0,0 +1,23 @@
+NullObject = Naught.build do |config|
+  config.black_hole
+  config.define_explicit_conversions
+  config.define_implicit_conversions
+end
+
+class NullObject
+  def presence
+    nil
+  end
+  def present?
+    false
+  end
+  def blank?
+    true
+  end
+  def empty?
+    true
+  end
+  def any?
+    false
+  end
+end