Rails Devise Registration Form with Nested Models

Question

I have the following models

members(id, name, company_id)
companies(id, name, ...)

Now when i signup using devise model - members i want to create a record in the companies model and update company_id in the members model.

Can i build the company in the signup for like below

class Brands::Members::RegistrationsController < Devise::RegistrationsController
  before_action :configure_sign_up_params, only: [:create]
# before_action :configure_account_update_params, only: [:update]

  # GET /resource/sign_up
  def new
    build_resource({})
    resource.build_company
    respond_with self.resource
  end
end

Members Model

class Member < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable

  acts_as_paranoid
  attr_accessor :company_name

  # Associations
  belongs_to :company

  accepts_nested_attributes_for :company
end

Company Model

class Company < ActiveRecord::Base
  extend FriendlyId
  # friendly_id :name, use: :slugged
  acts_as_paranoid

  @company_type = %w(agency brand)

  # Associations
  has_many :members, dependent: :destroy
  has_many :brands, dependent: :destroy
end

Signup Form

<h2>Sign up</h2>

<%= form_for(resource, as: resource_name, url: registration_path(resource_name)) do |f| %>
  <%= devise_error_messages! %>

  <div class="field">
    <%= f.label :name %><br />
    <%= f.text_field :name, autofocus: true, value: 'Harha MV' %>
  </div>

  <div class="field">
    <%= f.label :email %><br />
    <%= f.email_field :email, value: 'harsha@mink7.com' %>
  </div>

  <div class="field">
    <%= f.label :password %>
    <% if @minimum_password_length %>
    <em>(<%= @minimum_password_length %> characters minimum)</em>
    <% end %><br />
    <%= f.password_field :password, autocomplete: "off", value: 'harsha' %>
  </div>

  <h4>Enter your company details</h4>
  <%= f.fields_for :company do |fc| %>
    <div class="field">
      <%= fc.label :name %><br />
      <%= fc.text_field :name, value: 'Mink7' %>
    </div>

  <% end %>

  <div class="actions">
    <%= f.submit "Sign up" %>
  </div>
<% end %>

<%= render "brands/members/shared/links" %>

Error

NoMethodError at /members

undefined method `' for #<Company:0x007f99fc7e5638>

method_missing
activemodel (4.2.5.2) lib/active_model/attribute_methods.rb

    def method_missing(method, *args, &block)
      if respond_to_without_attributes?(method, true)
        super
      else
        match = match_attribute_method?(method.to_s)
        match ? attribute_missing(match, *args, &block) : super
      end
    end

Command Line Dump

NoMethodError - undefined method `created_by' for #<Company:0x007f9a04e65550>:
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Answer 1

Remove the f. from the f.fields_for write like this Reference Link

<%= fields_for :company do |company| %>
  <div class="field">
    <%= company.label :name, 'Company' %>
    <%= company.text_field :name %>
  </div>
<% end %>