Ruby on Rails 4.2, stack level too deep, associations and delegate() - ruby-on-rails

Question

I understand the cause of a Stack Level Too Deep error. I am failing to spot where/why it is occurring in my code base.
I've implemented a multi-model, multi-step wizard. The first two models (User and Company) are working, it is when I attempt to add in the third (Address) I get the error.
I suspect the error is related to the associations between the models, although I've failed to debug.
The code snippets below function correctly except when I add the 3 lines (marked with comments in the snippet) too the file app/wizards/user_wizard/step1.rb.
Relevant Models
app/models/company.rb
class Company < ActiveRecord::Base
include Validatable::Company
# Associations:
has_many :addresses, inverse_of: :company
accepts_nested_attributes_for :addresses, reject_if: :all_blank
has_many :employees, inverse_of: :company
accepts_nested_attributes_for :employees, reject_if: :all_blank
has_many :licenses, inverse_of: :company
accepts_nested_attributes_for :licenses, reject_if: :all_blank
has_many :vehicles, inverse_of: :company
accepts_nested_attributes_for :vehicles, reject_if: :all_blank
has_one :user, inverse_of: :company
end
app/models/address.rb
class Address < ActiveRecord::Base
# Associations:
belongs_to :company, inverse_of: :addresses
has_many :licenses, inverse_of: :address
accepts_nested_attributes_for :licenses, reject_if: :all_blank
has_many :initial_analyses, inverse_of: :address
accepts_nested_attributes_for :initial_analyses, reject_if: :all_blank
end
app/models/user.rb
class User < ActiveRecord::Base
include SoftDeletable
include Validatable::User
# Constants:
MARKER_ATTRIBUTES = %w[user_name].freeze # get marked with '(deleted)'
DEPENDANT_CHILDREN = %w[none].freeze # child resources to be deleted
# Associations:
belongs_to :role, inverse_of: :users
belongs_to :company, inverse_of: :user
accepts_nested_attributes_for :company, reject_if: :all_blank
has_many :auto_quotes, inverse_of: :user
end
db/schema.rb
ActiveRecord::Schema.define(version: 20170616131833) do
create_table "addresses", force: :cascade do |t|
t.integer "company_id"
t.text "site_name"
t.string "premises_code"
t.string "exempt_premises_code"
t.text "address"
t.string "city"
t.string "county"
t.string "sic_code"
t.string "postcode"
t.string "country"
t.boolean "sic_update"
t.boolean "deleted", default: false
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.datetime "deleted_at"
end
create_table "companies", force: :cascade do |t|
t.string "company_name"
t.string "registration_number"
t.string "type_of_business"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.datetime "deleted_at"
end
create_table "users", force: :cascade do |t|
t.string "email", default: "", null: false
t.string "encrypted_password", default: "", null: false
t.string "reset_password_token"
t.datetime "reset_password_sent_at"
t.datetime "remember_created_at"
t.integer "sign_in_count", default: 0, null: false
t.datetime "current_sign_in_at"
t.datetime "last_sign_in_at"
t.string "current_sign_in_ip"
t.string "last_sign_in_ip"
t.string "confirmation_token"
t.datetime "confirmed_at"
t.datetime "confirmation_sent_at"
t.string "unconfirmed_email"
t.integer "failed_attempts", default: 0, null: false
t.string "unlock_token"
t.datetime "locked_at"
t.datetime "created_at", null: false
t.datetime "updated_at", null: false
t.string "user_name"
t.datetime "deleted_at"
t.integer "role_id"
t.integer "company_id"
t.string "invitation_token"
t.datetime "invitation_created_at"
t.datetime "invitation_sent_at"
t.datetime "invitation_accepted_at"
t.integer "invitation_limit"
t.integer "invited_by_id"
t.string "invited_by_type"
t.integer "invitations_count", default: 0
end
add_index "users", ["company_id"], name: "index_users_on_company_id", unique: true
add_index "users", ["confirmation_token"], name: "index_users_on_confirmation_token", unique: true
add_index "users", ["email"], name: "index_users_on_email", unique: true
add_index "users", ["invitation_token"], name: "index_users_on_invitation_token", unique: true
add_index "users", ["invitations_count"], name: "index_users_on_invitations_count"
add_index "users", ["invited_by_id"], name: "index_users_on_invited_by_id"
add_index "users", ["reset_password_token"], name: "index_users_on_reset_password_token", unique: true
add_index "users", ["unlock_token"], name: "index_users_on_unlock_token", unique: true
end
Wizards
app/wizards/user_wizard/base.rb
module UserWizard
class Base
include ActiveModel::Model
STEPS = %w[step1 step2].freeze
attr_accessor :user
delegate(*::User.attribute_names.map {|attr| [attr, "#{attr}="] }.flatten, to: :user)
def initialize(user_attributes)
#user = ::User.new(user_attributes)
end
end
end
app/wizards/user_wizard/step1.rb
module UserWizard
class Step1 < UserWizard::Base
include Validatable::Company
attr_accessor :company
# One of 3 lines triggering circular reference by adding in Address model
attr_accessor :address
delegate(*::Company.attribute_names.map {|attr| [attr, "#{attr}="] }.flatten, to: :company)
# One of 3 lines triggering circular reference by adding in Address model
delegate(*::Address.attribute_names.map {|attr| [attr, "#{attr}="] }.flatten, to: :address)
def initialize(user_attributes)
super
#company = #user.build_company
# One of 3 lines triggering circular reference by adding in Address model
#address = #user.company.addresses.build
end
end
end
app/wizards/user_wizard/step2.rb
ommitted as it is irrelevant. code fails before ever instantiating this class

Answer 1

address has an address attribute. So the delegate method is trying to create a method address that will be delegated to address.
I'd suggest this:
module UserWizard
class Step1 < UserWizard::Base
include Validatable::Company
attr_accessor :company
# One of 3 lines triggering circular reference by adding in Address model
attr_accessor :company_address
delegate(*::Company.attribute_names.map {|attr| [attr, "#{attr}="] }.flatten, to: :company)
# One of 3 lines triggering circular reference by adding in Address model
delegate(*::Address.attribute_names.map {|attr| [attr, "#{attr}="] }.flatten, to: :company_address)
def initialize(user_attributes)
super
#company = #user.build_company
# One of 3 lines triggering circular reference by adding in Address model
#company_address = #user.company.addresses.build
end
end
end