rambler-digital-solutions / fish0

Rambler Site Fish patterns

Fish0

The fish doesn't think because the fish knows everything.

Fish0 is the plugin for read-only content websites with MongoDB storage. Works perfect with Rambler&Co CQRS architecture.

Installation

Simply add gem to your Gemfile

gem 'fish0'

Configuration

# config/initializers/fish0.rb

Fish0::Configuration.configure do |config|
  config.mongo_uri = 'mongodb://user:password@host_1:27017,replica_host_2:27017/project_db?auth_source=admin'
  config.mongo_params = { read: { mode: :secondary } }
end

Models

Inherit your model class from Fish0::Model and feel the power of the Fish!

With attribute define your attributes and with primary_key set your main primary key, e.g. id, slug, etc.

# app/models/article.rb
class Article < Fish0::Model
  # Define some attributes
  attribute :headline, String
  attribute :slug, String
  attribute :content, Array[Hash]
  attribute :published_at, DateTime

  primary_key :slug

  # ...
end

# app/controllers/articles_controller.rb
class ArticlesController < ApplicationController
  # ...

  def show
    @article = Article.where(slug: params[:slug]).first
  end

  # ...
end

Repository

Basic repository usage

This code will get first article with slug: 'content123' from articles MongoDB collection, and return content with class Article.

Fish0::Repository.new(:articles)
                 .where(slug: 'content123')
                 .first!

By default Fish0::Repository will coerce :entity_class from :collection, so you can skip this parameter.

Writing your own repository

# app/services/article_repository.rb
class ArticleRepository < Fish0::Repository
  def initialize
    super(:articles)
  end

  def published
    where(visible: true, published_at: { '$lt': DateTime.now })
  end
end

# app/controllers/articles_controller.rb
class ArticlesController < ApplicationController
  # ...

  def show
    @article = Article.where(slug: params[:slug]).published.first!
  end

  # ...
end

Pagination

# app/controllers/articles_controller.rb
class ArticlesController < ApplicationController
  include Fish0::Concerns::Paginatable

  def index
    @articles = paginate(Article.published)
  end

  # ...

  protected

  def per_page
    31
  end

  # ...
end

ViewModel

ViewModel concern wraps Virtus around your models. It also adds #to_partial_path and #type methods. Method #to_partial_path helps render your models via render helper.

# app/models/article.rb
class Article
  include Fish0::Concerns::ViewModel

  attribute :headline, String
  attribute :slug, String
  attribute :content, Array[Hash]
  attribute :published_at, DateTime

  # ...
end

Cacheable

If you want your models to support #cache_key method and use Rails caching, you should include Fish0::Concerns::Cacheable to such models.

Your model should respond to :updated_at with DateTime object.

# app/models/article.rb
class Article
  # ...
  cacheable

  # ...
end

# app/controllers/articles_controller.rb
class ArticlesController < ApplicationController
  # ...

  def show
    @article = Article.where(slug: params[:slug]).first!
    if stale?(@article)
      respond_to do |format|
        format.html
      end
    end
  end

  # ...
end