Encapsulate complex view logic using models not connected to DB

_alert.html.erb

<div class="<%= class_names(alert.classes) %>" role="alert">
  <% if alert.title %>
    <h4 class="alert-heading"><%= alert.title %></h4>
  <% end %>
  <%= alert.description %>

  <% if alert.dismissable %>
    <button type="button" class="btn-close" data-bs-dismiss="alert" aria-label="Close"></button>
  <% end %>
</div>

alert.rb

class Alert
  include ActiveModel::Model

  attr_accessor :type, :dismissable, :title, :description

  validates :type, inclusion: { in: %w(primary secondary success danger warning info light dark) }
  validates :dismissable, inclusion: { in: [true, false] }

  def initialize(type: "primary", dismissable: true, title: nil, description:)
    @type, @dismissable, @title, @description = type, dismissable, title, description
  end

  def classes
    ["alert", "alert-#{type}", { "alert-dismissible": dismissable }]
  end

  def to_partial_path
    validate!
    "shared/alert"
  end
end

anyview.html.erb

<%= render Alert.new(title: "Test", description: "HOOOO") %>
or
<%= render Alert.new(type: "danger", description: flash[:alert])%>

One thing I can't seem to figure out is how the class is assigned to the alert variable within the partial?

One thing I can't seem to figure out is how the class is assigned to the alert variable within the partial?

@prdanelli My guess is that Rails is calling something like record.class.to_s on the instance or use the partial name to figure out the variable name. Could maybe even be record.model_name.name.