Create device model and setup devise, activeadmin and rspec!

- with attributes: model, imei_number, unique_id and access_token
 - access_token is automatically generated on create

app/admin/admin_user.rb

@@ -0,0 +1,28 @@
+ActiveAdmin.register AdminUser do
+  permit_params :email, :password, :password_confirmation
+
+  index do
+    selectable_column
+    id_column
+    column :email
+    column :current_sign_in_at
+    column :sign_in_count
+    column :created_at
+    actions
+  end
+
+  filter :email
+  filter :current_sign_in_at
+  filter :sign_in_count
+  filter :created_at
+
+  form do |f|
+    f.inputs "Admin Details" do
+      f.input :email
+      f.input :password
+      f.input :password_confirmation
+    end
+    f.actions
+  end
+
+end

app/admin/dashboard.rb

@@ -0,0 +1,33 @@
+ActiveAdmin.register_page "Dashboard" do
+
+  menu priority: 1, label: proc{ I18n.t("active_admin.dashboard") }
+
+  content title: proc{ I18n.t("active_admin.dashboard") } do
+    div class: "blank_slate_container", id: "dashboard_default_message" do
+      span class: "blank_slate" do
+        span I18n.t("active_admin.dashboard_welcome.welcome")
+        small I18n.t("active_admin.dashboard_welcome.call_to_action")
+      end
+    end
+
+    # Here is an example of a simple dashboard with columns and panels.
+    #
+    # columns do
+    #   column do
+    #     panel "Recent Posts" do
+    #       ul do
+    #         Post.recent(5).map do |post|
+    #           li link_to(post.title, admin_post_path(post))
+    #         end
+    #       end
+    #     end
+    #   end
+
+    #   column do
+    #     panel "Info" do
+    #       para "Welcome to ActiveAdmin."
+    #     end
+    #   end
+    # end
+  end # content
+end

app/assets/javascripts/active_admin.js.coffee

@@ -0,0 +1 @@
+#= require active_admin/base

app/assets/stylesheets/active_admin.scss

@@ -0,0 +1,17 @@
+// SASS variable overrides must be declared before loading up Active Admin's styles.
+//
+// To view the variables that Active Admin provides, take a look at
+// `app/assets/stylesheets/active_admin/mixins/_variables.css.scss` in the
+// Active Admin source.
+//
+// For example, to change the sidebar width:
+// $sidebar-width: 242px;
+
+// Active Admin's got SASS!
+@import "active_admin/mixins";
+@import "active_admin/base";
+
+// Overriding any non-variable SASS must be done after the fact.
+// For example, to change the default status-tag color:
+//
+//   .status_tag { background: #6090DB; }

app/models/admin_user.rb

@@ -0,0 +1,6 @@
+class AdminUser < ActiveRecord::Base
+  # Include default devise modules. Others available are:
+  # :confirmable, :lockable, :timeoutable and :omniauthable
+  devise :database_authenticatable, 
+         :recoverable, :rememberable, :trackable, :validatable
+end

app/models/device.rb

@@ -0,0 +1,9 @@
+class Device < ActiveRecord::Base
+  validates :unique_id, :model, presence: true
+  validates :unique_id, uniqueness: true
+  before_create :generate_access_token
+
+  def generate_access_token
+    self.access_token = SecureRandom.uuid
+  end
+end