.
└── todo
    ├── cell
    │   ├── index.rb
    │   └── new.rb
    ├── contract
    │   └── form.rb
    ├── operation
    │   ├── create.rb
    │   └── index.rb
    └── view
        ├── form.haml
        ├── index.haml
        └── new.haml

module Todo::Operation
  class Create < Trailblazer::Operation
    class Present < Trailblazer::Operation
      step Model(Todo, :new)
      step Contract::Build( constant: Todo::Contract::Form )
    end

    step Subprocess(Present) #gegenwärtiger Klassenschrittaufruf
    step Contract::Validate(key: :todo) #Validierung mit Vertrag
    step Contract::Persist() #Im Modell speichern
  end
end

module Todo::Contract
  class Form < Reform::Form
    include Reform::Form::ActiveModel
    property :title
    property :description
    property :completed
      
    validates :title, presence: true
    validates :description, length: { minimum: 2 }

    #Sie können auch überschreiben
    # def title
    #  super.capitalize
    # end
  end
end

module Todo::Cell
  class New < Trailblazer::Cell
    include ActionView::RecordIdentifier
    include ActionView::Helpers::FormOptionsHelper
    include SimpleForm::ActionViewExtensions::FormHelper
  end
end

= simple_form_for(model, html: {novalidate: true}) do |f|
  = f.input :title, placeholder: "Title"
  %br
  = f.input :description, as: :text, placeholder: "Description"
  %br
  = f.submit 'Submit'
  = link_to 'Back', todos_path

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