18F/C2

ActiveAdmin.register Step do
  actions :index, :show, :update, :edit

  filter :status

  permit_params :completed_at, :completer_id, :status, :user_id

  index do
    column :id
    column :status
    column :user
    column :created_at
    column :updated_at
    column :completed_at
    column :completer
    column :proposal
    column :position
    actions
  end

  # make sure side effects are triggered
  controller do
    def update
      super
      if params.require(:step)[:status]
        update_step_via_status
      end
    end

    def update_step_via_status
      step_params = params.require(:step)
      step = resource
      if step_params[:status] == "completed"
        if step_params[:completer_id].empty?
          step.update_attributes!(completer: current_user)
        end
        unless step.completed_at
          step.update_attributes!(completed_at: Time.current)
        end
      end
    end
  end

  # /:id/edit page
  form do |f|
    f.inputs "Step" do
      f.input :completed_at
      f.input :completer
      f.input :status, collection: %w(pending actionable completed)
      f.input :user
    end
    f.actions
  end

  # /:id page
  show do
    attributes_table do
      row :proposal
      row :status
      row :position
      row :user
      row :created_at
      row :updated_at
      row :completer
      row :completed_at
    end
  end
end