Class: Mongoid::Validations::UniquenessValidator

Inherits:
ActiveModel::EachValidator
  • Object
show all
Defined in:
lib/mongoid/validations/uniqueness.rb

Overview

Validates whether or not a field is unique against the documents in the database.

Examples:

Define the uniqueness validator.


class Person
  include Mongoid::Document
  field :title

  validates_uniqueness_of :title
end

Instance Method Summary collapse

Instance Method Details

#setup(klass) ⇒ Object

Unfortunately, we have to tie Uniqueness validators to a class.



19
20
21
 
# File 'lib/mongoid/validations/uniqueness.rb', line 19

def setup(klass)
  @klass = klass
end

#validate_each(document, attribute, value) ⇒ Object

TODO:

Durran: This method needs refactoring.

Validate the document for uniqueness violations.

Examples:

Validate the document.

validate_each(person, :title, "Sir")

Parameters:

  • document (Document) —

    The document to validate.

  • attribute (Symbol) —

    The field to validate on.

  • value (Object) —

    The value of the field.



33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
 
# File 'lib/mongoid/validations/uniqueness.rb', line 33

def validate_each(document, attribute, value)
  if document.embedded?
    return if document._parent.nil?
    criteria = document._parent.send(document.metadata.name)
    # If the parent document embeds_one, no need to validate uniqueness
    return if criteria.is_a?(Mongoid::Document)
    criteria = criteria.where(attribute => unique_search_value(value), :_id => {'$ne' => document._id})
  else
    criteria = @klass.where(attribute => unique_search_value(value))
    unless document.new_record?
      criteria = criteria.where(:_id => {'$ne' => document._id})
    end
  end

  Array.wrap(options[:scope]).each do |item|
    criteria = criteria.where(item => document.attributes[item.to_s])
  end
  if criteria.exists?
    document.errors.add(
      attribute,
      :taken,
      options.except(:case_sensitive, :scope).merge(:value => value)
    )
  end
end