TLDR: Button to update status attribute of a table

Mission: add buttons to change the status of a task

HOWTO:

migration - add status column to tasks

add_column :tasks, :status, :string, null: false, default: "planned"

task.rb - list available statuses

  validates :status, presence: true
  STATUSES = [:planned, :progress, :done]

tasks_controller.rb - add action to change status

  def change_status
    @task = Task.find(params[:id])
    if params[:status].present? && Task::STATUSES.include?(params[:status].to_sym)
      @task.update(status: params[:status])
    end
    redirect_to @task, notice: "Status updated to #{@task.status}"
  end

routes.rb - add actionable link to change status.

  resources :tasks do
    member do
      patch :change_status
    end
  end

tasks/show.html.erb

  <% Task::STATUSES.each do |status| %>
    <%= link_to change_status_task_path(@task, status: status), method: :patch do %>
      <%= status %>
    <% end %>
  <% end %>

Voila, that's it!