Generalized Soft Deletion for Rails

example.rb

class Example <  ActiveRecord::Base
  include SoftDeletion
end

soft_deletion.rb

module SoftDeletion
  def self.included(base)
    base.class_eval do
      default_scope { where(deleted: false) }
    end
  end

  def destroy
    update_attribute(:deleted, true)
  end
end

soft_deletion_spec.rb

require "spec_helper"

describe SoftDeletion do
  class Fun < ActiveRecord::Base
    include SoftDeletion
  end

  around :each do |example|
    connection = ActiveRecord::Base.connection
    connection.create_table :funs do |t|
      t.boolean :deleted, default: "f"
    end
    example.run
    connection.drop_table :funs
  end

  it "soft-deletes objects" do
    fun = Fun.create!
    fun.destroy

    expect(Fun.unscoped.where(id: fun.id)).to be_present
  end

  it "defaults the scope" do
    fun1 = Fun.create!
    fun2 = Fun.create!

    fun2.destroy

    expect(Fun.count).to eq(1)
    expect(Fun.unscoped.count).to eq(2)
  end
end