Module: BeyondAlbert::Acts::TextBasedNestedSet

Defined in:

lib/text_based_nested_set/text_based_nested_set.rb,
lib/text_based_nested_set/model.rb

Overview

:nodoc:

Defined Under Namespace

Modules: Model

Instance Method Summary

• #acts_as_text_based_nested_set(options = {}) ⇒ Object

  this acts provides Text Based Nested Set functionality.

Instance Method Details

#acts_as_text_based_nested_set(options = {}) ⇒ Object

this acts provides Text Based Nested Set functionality. Text Based Nested Set is another way to implementation of an SQL Nested Set created by Trever Shick. Compare to lft and rgt Nested Set, this implementation can updates and deletions without require all of the nodes to be updated.

set up:

1. Add parent_id, path, position column to exsiting model

class AddTextBasedNestedSetToDemo < ActiveRecord::Migration

def change
  add_column :demos, :parent_id, :integer, default: 0
  add_column :demos, :path, :string, default: '/0/'
  add_column :demos, position, :integer, default: 0
end

end

1. add acts_as_text_based_nested_set method to target model

See BeyondAlbert::Acts::TextBasedNestedSet::Model for a list ofclass methods and instance methods added to acts_as_text_based_nested_set models.

# File 'lib/text_based_nested_set/text_based_nested_set.rb', line 25

def acts_as_text_based_nested_set(options = {})
  include Model

  before_destroy :destroy_descendants
end