### Set up a Spree backend only install

```shell
rails new store-backend
```

### Gemfile

```ruby
gem 'spree_backend', github: 'spree/spree'
gem 'devise'
```

### Install Spree and Devise

```
rails g spree:install

rails g devise:install
rails g devise User

bundle exec rake db:migrate
```

### This should go in your User model

```ruby
has_and_belongs_to_many :spree_roles

def has_spree_role?(role)
  self.spree_roles.all.include? role
end
```

* Generate custom user set up for spree

```
rails g spree:custom_user User
```

* Change Spree.user class to User on initializer spree.rb

```
Spree.user_class = "User"
```

* Add fields to custom user

```
bundle exec rake db:migrate
```

* Remove both all.css and all.js from vendor/assets/javascript|stylesheets/spree/frontend/

### Make sure your config/routes.rb look like this

```ruby
Rails.application.routes.draw do
  root to: "spree/admin/orders#index"
  mount Spree::Core::Engine, :at => '/'

  devise_for :users
  devise_scope :user do
    get '/login', :to => "devise/sessions#new"
    delete '/logout', :to => "devise/sessions#destroy"
  end
end
```


### Point spree_signup_path to login page

```ruby
# since we don't need signup on a backend install
def spree_signup_path
  main_app.login_path
end
```

### Create admin user via rails console

```ruby
user = User.create(email: "spree@example.com", password: "spree123")
user.spree_roles << Spree::Role.find_or_create_by(name: "admin")
```

### Deface admin layout template to add logout link

Create this file in app/overrides/spree/layouts/admin/inject_login_bar.html.erb.deface

```
<!-- replace_contents "[data-hook='admin_login_navigation_bar']" -->

<ul id="login-nav" class="inline-menu">
  <li><%= link_to('Edit', main_app.edit_user_registration_path) %></li>
  <li><%= link_to('Logout', main_app.destroy_user_session_path, :method => :delete) %></li>
</ul>
```