Class: Releaf::Content::Node::SinglenessValidator

Inherits:
ActiveModel::Validator
  • Object
show all
Defined in:
app/validators/releaf/content/node/singleness_validator.rb

Overview

Validator to test if node is valid, when created under given parrent node

validator needs :for and :under options, both can be either array of classes or single class.

:for option specifies for which nodes validation should be applied

:under option specifies under which nodes only single node of given type should be valid. If under is unspecified, then only single node with given class can be created under entrie content tree.

In the example above, Text node or book node can be added in any leve under Store node, but only once. However they can be added to any other node as many times as needed, as long as none of ancestors are Store node.

Examples:


class Node < ActiveRecord::Base
  includes Releaf::Content::Node
  validates_with Releaf::Content::Node::ParentValidator, for: [Text, Book], under: Store
end

Instance Method Summary collapse

Instance Method Details

#validate(node) ⇒ Object 



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# File 'app/validators/releaf/content/node/singleness_validator.rb', line 28

def validate node
  @node = node
  node.errors.add(:content_type, 'node exists') unless node_valid?
  remove_instance_variable(:@node)
end