viewmodel

A ViewModel layer for Ruby On Rails

Installation

Add viewmodel to your Rails application

bundle add viewmodel

Usage

Create a ViewModel object in a corresponding view_models folder

app/
├─ view_models/
│   └─ products/
│       └─ show_view_model.rb
├─ views/
│   └─ products/
│       └─ show.html.erb

The contents of the view model look something like this:

class Products::ShowViewModel < ViewModel
  def internal_reference
    [@product.id, @product.name].join("-")
  end
end

The view would then look like this;

<div id="product">
  <h1><%= @product.name %></h1>
  <h2><%= @internal_reference %></h2>
</div>

Core concepts

• All instance variables and local variables (local_assigns) are passed to the view model.
• All attributes and public methods are exposed to the view
• You can override local variables in the view model with public methods
• You can add new local variables in the view model with public methods