Nested Attributes Example

_form.html.erb

<% cancel_path ||= company.persisted? ? [:account, company] : [:account, @team, :companies] %>

<%= form_with model: company, url: (company.persisted? ? [:account, company] : [:account, @team, :companies]), local: true, class: 'form' do |form| %>
  <%= render "shared/limits/form", form: form, cancel_path: cancel_path do %>
    <%= render 'account/shared/forms/errors', form: form %>

    <% with_field_settings form: form do %>
      <%= render 'shared/fields/text_field', method: :name, options: {autofocus: true} %>
      <%= render 'shared/fields/text_field', method: :legal_name %>
      <%= render 'shared/fields/text_field', method: :ein %>
      <%# 🚅 super scaffolding will insert new fields above this line. %>
    <% end %>

    <h4>Addresses</h4>
    <%= form.fields_for :postal_addresses do |address_form| %>
        <div class="form-group">
        <%= render 'shared/fields/text_field', form: address_form, method: :street1 %>
        <%= render 'shared/fields/text_field', form: address_form, method: :street2 %>
        <%= render 'shared/fields/text_field', form: address_form, method: :city %>
        <%= render 'shared/fields/text_field', form: address_form, method: :state %>
        <%= render 'shared/fields/text_field', form: address_form, method: :zipcode %>
        </div>
      <% end %>

    <div class="buttons">
      <%= form.submit (form.object.persisted? ? t('.buttons.update') : t('.buttons.create')), class: "button" %>
      <%= link_to t('global.buttons.cancel'), cancel_path, class: "button-secondary" %>
    </div>
  <% end %>
<% end %>

companies_controller.rb

class Account::CompaniesController < Account::ApplicationController
  account_load_and_authorize_resource :company, through: :team, through_association: :companies

  # GET /account/teams/:team_id/companies
  # GET /account/teams/:team_id/companies.json
  def index
    delegate_json_to_api
  end

  # GET /account/companies/:id
  # GET /account/companies/:id.json
  def show
    delegate_json_to_api
  end

  # GET /account/teams/:team_id/companies/new
  def new
    @company.postal_addresses.new
  end

  # GET /account/companies/:id/edit
  def edit
  end

  # POST /account/teams/:team_id/companies
  # POST /account/teams/:team_id/companies.json
  def create
    respond_to do |format|
      if @company.save
        format.html { redirect_to [:account, @team, :companies], notice: I18n.t("companies.notifications.created") }
        format.json { render :show, status: :created, location: [:account, @company] }
      else
        format.html { render :new, status: :unprocessable_entity }
        format.json { render json: @company.errors, status: :unprocessable_entity }
      end
    end
  end

  # PATCH/PUT /account/companies/:id
  # PATCH/PUT /account/companies/:id.json
  def update
    respond_to do |format|
      if @company.update(company_params)
        format.html { redirect_to [:account, @company], notice: I18n.t("companies.notifications.updated") }
        format.json { render :show, status: :ok, location: [:account, @company] }
      else
        format.html { render :edit, status: :unprocessable_entity }
        format.json { render json: @company.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /account/companies/:id
  # DELETE /account/companies/:id.json
  def destroy
    @company.destroy
    respond_to do |format|
      format.html { redirect_to [:account, @team, :companies], notice: I18n.t("companies.notifications.destroyed") }
      format.json { head :no_content }
    end
  end

  private

  include strong_parameters_from_api

  def process_params(strong_params)
    # 🚅 super scaffolding will insert processing for new fields above this line.
  end
end

company.rb

class Company < ApplicationRecord
  belongs_to :team
  has_many :postal_addresses, dependent: :destroy, enable_updates: true, inverse_of: :company
  accepts_nested_attributes_for :postal_addresses, allow_destroy: true, reject_if: :all_blank
  validates :name, presence: true
end