admin::vehicles_controller.rb

module Admin
  class VehiclesController < Admin::ApplicationController
    # To customize the behavior of this controller,
    # simply overwrite any of the RESTful actions. For example:
    #
    # def index
    #   super
    #   @resources = Vehicle.all.paginate(10, params[:page])
    # end

    # Define a custom finder by overriding the `find_resource` method:
    # def find_resource(param)
    #   Vehicle.find_by!(slug: param)
    # end

    # See https://administrate-docs.herokuapp.com/customizing_controller_actions
    # for more information
    expose(:vehicle, attributes: :vehicle_params)
    expose(:vehicles) { Vehicle.order(:make).page params[:page] }

    private

    # Use strong_parameters for attribute whitelisting
    # Be sure to update your create() and update() controller methods.

    def vehicle_params
      params.require(:vehicle).permit(:vehicle_photo)
    end
  end
end

development.log

Started PATCH "/admin/vehicles/1" for ::1 at 2016-05-18 15:39:35 -0400
Processing by Admin::VehiclesController#update as HTML
  Parameters: {"utf8"=>"✓", "authenticity_token"=>"wWCyW6/HhoYOxYEMjMr0XsOvYLtda2HERxIXbTbf9HbF4MDRBwFzI6NV5GwXMbLpS1XOoLYdHZtJthjzi4THrQ==", "vehicle"=>{"make"=>"Dodge", "model"=>"RAM 1500", "trim"=>"", "year"=>"", "price"=>"27500", "vin"=>"", "doors"=>"", "color"=>"", "int_color"=>"", "ext_color"=>"", "description"=>"", "sold"=>"0", "used"=>"0", "new"=>"0", "warranty"=>"0", "warranty_type"=>"", "featured"=>"1", "vehicle_photo"=>[#<ActionDispatch::Http::UploadedFile:0x007fcc0a31b2e8 @tempfile=#<Tempfile:/var/folders/gp/m0w644rs1f3gmrz11r5ymx3m0000gn/T/RackMultipart20160518-41740-zstbj.jpg>, @original_filename="IMG_0263.jpg", @content_type="image/jpeg", @headers="Content-Disposition: form-data; name=\"vehicle[vehicle_photo][]\"; filename=\"IMG_0263.jpg\"\r\nContent-Type: image/jpeg\r\n">]}, "commit"=>"Update Vehicle", "id"=>"1"}
  Vehicle Load (0.4ms)  SELECT  "vehicles".* FROM "vehicles" WHERE "vehicles"."id" = $1 LIMIT 1  [["id", 1]]
Unpermitted parameter: vehicle_photo
   (0.2ms)  BEGIN
   (0.2ms)  ROLLBACK
  Rendered /Users/evansparkman/.rvm/gems/ruby-2.3.1@easylot/gems/administrate-0.2.0/app/views/fields/string/_form.html.erb (0.8ms)
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  Rendered fields/photo_field/_form.html.erb (0.4ms)
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  Rendered /Users/evansparkman/.rvm/gems/ruby-2.3.1@easylot/gems/administrate-0.2.0/app/views/administrate/application/edit.html.erb within layouts/administrate/application (105.3ms)
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  Rendered /Users/evansparkman/.rvm/gems/ruby-2.3.1@easylot/gems/administrate-0.2.0/app/views/administrate/application/_javascript.html.erb (24.4ms)
Completed 200 OK in 233ms (Views: 227.2ms | ActiveRecord: 0.8ms)

photo_field.rb

require "administrate/field/base"

class PhotoField < Administrate::Field::Base
  def to_s
    data
  end
end

vehicle.rb

class Vehicle < ActiveRecord::Base
  has_attached_file :vehicle_photo,
                    whiny_thumbnails: true,
                    default_url: '/:class/:attachment/missing.png',
                    url: '/assets/:style_:basename.:extension',
                    path: ':rails_root/public/assets/:style_:basename.:extension',
                    styles: {
                      thumb: '100x100',
                      large: '770x500'
                    }
  validates_attachment_content_type :vehicle_photo,
                                    content_type: %r{/\Aimage\/.*\Z/}

  validates_attachment_presence :vehicle_photo
  validates_attachment_size :vehicle_photo, less_than: 5.megabytes
end

vehicle_dashboard.rb

require 'administrate/base_dashboard'

class VehicleDashboard < Administrate::BaseDashboard
  # ATTRIBUTE_TYPES
  # a hash that describes the type of each of the model's fields.
  #
  # Each different type represents an Administrate::Field object,
  # which determines how the attribute is displayed
  # on pages throughout the dashboard.
  ATTRIBUTE_TYPES = {
    id: Field::Number,
    make: Field::String,
    model: Field::String,
    trim: Field::String,
    year: Field::String,
    price: Field::Number.with_options(
      prefix: '$',
      multipler: 0.01,
      decimals: 2
    ),
    vin: Field::String,
    doors: Field::String,
    color: Field::String,
    int_color: Field::String,
    ext_color: Field::String,
    description: Field::Text,
    sold: Field::Boolean,
    used: Field::Boolean,
    new: Field::Boolean,
    warranty: Field::Boolean,
    warranty_type: Field::String,
    created_at: Field::DateTime,
    updated_at: Field::DateTime,
    featured: Field::Boolean,
    vehicle_photo: PhotoField
  }.freeze

  # COLLECTION_ATTRIBUTES
  # an array of attributes that will be displayed on the model's index page.
  #
  # By default, it's limited to four items to reduce clutter on index pages.
  # Feel free to add, remove, or rearrange items.
  COLLECTION_ATTRIBUTES = [
    :id,
    :make,
    :model,
    :trim,
    :price
  ].freeze

  # SHOW_PAGE_ATTRIBUTES
  # an array of attributes that will be displayed on the model's show page.
  SHOW_PAGE_ATTRIBUTES = [
    :id,
    :make,
    :model,
    :trim,
    :year,
    :price,
    :vin,
    :doors,
    :color,
    :int_color,
    :ext_color,
    :description,
    :sold,
    :used,
    :new,
    :warranty,
    :warranty_type,
    :created_at,
    :updated_at,
    :featured
  ].freeze

  # FORM_ATTRIBUTES
  # an array of attributes that will be displayed
  # on the model's form (`new` and `edit`) pages.
  FORM_ATTRIBUTES = [
    :make,
    :model,
    :trim,
    :year,
    :price,
    :vin,
    :doors,
    :color,
    :int_color,
    :ext_color,
    :description,
    :sold,
    :used,
    :new,
    :warranty,
    :warranty_type,
    :featured,
    :vehicle_photo
  ].freeze

  # Overwrite this method to customize how vehicles are displayed
  # across all pages of the admin dashboard.
  #
  def display_resource(vehicle)
    "Vehicle $#{vehicle.price} - #{vehicle.make} #{vehicle.model}"
  end
end