Carnival

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Carnival is an easy-to-use and extensible Rails Engine to speed up the development of data management interfaces. It provides a managing infra-structure for your application.

When you use Carnival you'll benefit from a set of features out-of-the-box. If you need to change anything, you can write your own version of the code, using real Ruby code in Rails standard components without worrying about a specific syntax or DSL.

Requirements

• Carnival works with Rails 4.0 onwards.

Features

• Easy way to CRUD any data;
• Search data easily. Advanced searches in a minute. You can specify which fields you want to search for;
• Fancy time filter, based on Toggl design;
• Nice default layout, ready to use;
• New and Edit forms are easily configured. If you do not like them, you can write your own views.

Detailed features

• Index List

  • Ordering by any column
  • Scope
  • Advanced Search
  • Custom Links
  • Remote Actions
  • Custom Actions
  • Batch Operations
  • Custom CSS Cell
  • Delete
  • CSV Export

• Edit form

  • Create new
  • Update existent
  • Nested Form
  • Associate an existent
  • Delete
  • ImagePreview
  • Relation select (Autocomplete)
  • Grid config (field order and size)
  • Select Enum

• Show

  • Grid config (field order and size)
  • Relation links
  • Custom partial view
  • Show as list

• Menu

  • Customize Order, route, text, label and class

Additional Docs

You can find more detailed docs in the links below:

• Action
• Controller
• Field
• Presenter
• Scope

Getting started

Add the gem to your Gemfile:

gem 'carnival'

Run bundle install.

Then, execute rails generate carnival:install to generate the initializer.

Basic Usage

Carnival started relying only on MVC model. As we developed it, we realized that a Presenter would better describe our models. We used the presenter to avoid fat models to emerge on our design.

Model

It is a regular Active Record model. We only have to include the Carnival Helper:

module Admin
  class Company < ActiveRecord::Base
    include Carnival::ModelHelper
  end
end

Controller

It is also a regular Controller, with some minor differences:

• Inherits from Carnival::BaseAdminController
• Uses the default admin layout: layout 'carnival/admin'
• When creating or editing data, you should configure the permitted params.

module Admin
  class CompaniesController < Carnival::BaseAdminController
    layout 'carnival/admin'

    # ...

    private

    def permitted_params
      params.permit(admin_company: [:name])
    end
  end
end

See more about the Controller at Controller Properties

Presenter

All the "magic" of Carnival happens at Presenter. Each model managed under Carnival Admin will have a presenter associated to it. The presenter describes how the model's attributes will be presented.

module Admin
  class CompanyPresenter < Carnival::BaseAdminPresenter
    field :id,
          actions: [:index, :show], sortable: false,
          advanced_search: { operator: :equal }
    field :name,
          actions: [:index, :new, :edit, :show],
          advanced_search: { operator: :like }
    field :created_at, actions: [:index, :show]

    action :show
    action :edit
    action :destroy
    action :new
  end
end

See more about the Presenter at Presenter Properties.

Menu

The menu of Carnival can be configured in the 'config/initializers/carnival_initializers.rb' file.

Eg.:

config.menu = {
  city: {
    label: 'city',
    class: '',
    link: 'admin_cities_path', # You can use the route name as String to define the link
    subs: [
      {
        label: 'custom_city',
        class: '',
        link: 'admin/custom/cities', # You can also use the full path
      },
      {
        label: 'google',
        class: '',
        link: 'http://www.google.com'
      }
    ]
  },

  # ...
}

Customizing Carnival

Custom Views

Carnival permits that you specify some partials for your page, you just need to add your partial in the app/views/carnival/extra_header.html.haml.

Possible Partials:

• extra_header

  • Extra HTML to render in page header.

• app_logo

  • Define a specific partial for your app logo.
  • Default Value: link_to <App Name>, root_path

• extra_footer

  • Extra HTML to render in page footer.

Configurations

Custom AdminUser

If you want to have your own AdminUser class or need to add methods to that class, you need to do the following steps:

• Configure the ar_admin_user_class in the carnival/_initializers.rb file.

  config.devise_class_name = 'MyAdminClass'

• Your class need to inherit from Carnival::AdminUser.

Custom Root Action

  config.root_action = 'my_controller#my_action'

Application Name

  config.app_name = 'Application Name'

I18n

You can add custom translations for the actions [:new, :show, :edit, :destroy]

  company:
    new: Create New company
    show: Show company

Integrations

It can be easily integrated with gems that you already know and use.

Authentication

• Devise

Rich Text Editor

• CKEditor

File upload

• Paperclip