class Mongoid::Validatable::UniquenessValidator

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

@example Define the uniqueness validator.

class Person
  include Mongoid::Document
  field :title

  validates_uniqueness_of :title
end

It is also possible to limit the uniqueness constraint to a set of records matching certain conditions:

class Person
  include Mongoid::Document
  field :title
  field :active, type: Boolean

  validates_uniqueness_of :title, conditions: -> {where(active: true)}
end

Public Instance Methods

validate_each(document, attribute, value) click to toggle source

Validate the document for uniqueness violations.

@example Validate the document.

validate_each(person, :title, "Sir")

@param [ Document ] document The document to validate. @param [ Symbol ] attribute The field to validate on. @param [ Object ] value The value of the field.

@return [ Errors ] The errors.

@since 1.0.0

# File lib/mongoid/validatable/uniqueness.rb, line 40
def validate_each(document, attribute, value)
  with_query(document) do
    attrib, val = to_validate(document, attribute, value)
    return unless validation_required?(document, attrib)
    if document.embedded?
      validate_embedded(document, attrib, val)
    else
      validate_root(document, attrib, val)
    end
  end
end

Private Instance Methods

add_error(document, attribute, value) click to toggle source

Add the error to the document.

@api private

@example Add the error.

validator.add_error(doc, :name, "test")

@param [ Document ] document The document to validate. @param [ Symbol ] attribute The name of the attribute. @param [ Object ] value The value of the object.

@since 2.4.10

# File lib/mongoid/validatable/uniqueness.rb, line 66
def add_error(document, attribute, value)
  document.errors.add(
    attribute, :taken, options.except(:case_sensitive, :scope).merge(value: value)
  )
end
case_sensitive?() click to toggle source

Should the uniqueness validation be case sensitive?

@api private

@example Is the validation case sensitive?

validator.case_sensitive?

@return [ true, false ] If the validation is case sensitive.

@since 2.3.0

# File lib/mongoid/validatable/uniqueness.rb, line 82
def case_sensitive?
  !(options[:case_sensitive] == false)
end
create_criteria(base, document, attribute, value) click to toggle source

Create the validation criteria.

@api private

@example Create the criteria.

validator.create_criteria(User, user, :name, "syd")

@param [ Class, Proxy ] base The base to execute the criteria from. @param [ Document ] document The document to validate. @param [ Symbol ] attribute The name of the attribute. @param [ Object ] value The value of the object.

@return [ Criteria ] The criteria.

@since 2.4.10

# File lib/mongoid/validatable/uniqueness.rb, line 101
def create_criteria(base, document, attribute, value)
  criteria = scope(base.unscoped, document, attribute)
  criteria.selector.update(criterion(document, attribute, value.mongoize))
  criteria
end
criterion(document, attribute, value) click to toggle source

Get the default criteria for checking uniqueness.

@api private

@example Get the criteria.

validator.criterion(person, :title, "Sir")

@param [ Document ] document The document to validate. @param [ Symbol ] attribute The name of the attribute. @param [ Object ] value The value of the object.

@return [ Criteria ] The uniqueness criteria.

@since 2.3.0

# File lib/mongoid/validatable/uniqueness.rb, line 121
def criterion(document, attribute, value)
  field = document.database_field_name(attribute)

  if value && localized?(document, field)
    conditions = (value || {}).inject([]) { |acc, (k,v)| acc << { "#{field}.#{k}" => filter(v) }}
    selector = { "$or" => conditions }
  else
    selector = { field => filter(value) }
  end

  if document.persisted? && !document.embedded?
    selector.merge!(_id: { "$ne" => document._id })
  end
  selector
end
filter(value) click to toggle source

Filter the value based on whether the check is case sensitive or not.

@api private

@example Filter the value.

validator.filter("testing")

@param [ Object ] value The value to filter.

@return [ Object, Regexp ] The value, filtered or not.

@since 2.3.0

# File lib/mongoid/validatable/uniqueness.rb, line 149
def filter(value)
  !case_sensitive? && value ? /\A#{Regexp.escape(value.to_s)}$/i : value
end
localized?(document, attribute) click to toggle source

Is the attribute localized?

@api private

@example Is the attribute localized?

validator.localized?(doc, :field)

@param [ Document ] document The document getting validated. @param [ Symbol ] attribute The attribute to validate.

@return [ true, false ] If the attribute is localized.

@since 4.0.0

# File lib/mongoid/validatable/uniqueness.rb, line 310
def localized?(document, attribute)
  document.fields[document.database_field_name(attribute)].try(:localized?)
end
scope(criteria, document, _attribute) click to toggle source

Scope the criteria to the scope options provided.

@api private

@example Scope the criteria.

validator.scope(criteria, document)

@param [ Criteria ] criteria The criteria to scope. @param [ Document ] document The document being validated.

@return [ Criteria ] The scoped criteria.

@since 2.3.0

# File lib/mongoid/validatable/uniqueness.rb, line 166
def scope(criteria, document, _attribute)
  Array.wrap(options[:scope]).each do |item|
    name = document.database_field_name(item)
    criteria = criteria.where(item => document.attributes[name])
  end
  criteria
end
scope_value_changed?(document) click to toggle source

Scope reference has changed?

@api private

@example Has scope reference changed?

validator.scope_value_changed?(doc)

@param [ Document ] document The embedded document.

@return [ true, false ] If the scope reference has changed.

@since

# File lib/mongoid/validatable/uniqueness.rb, line 202
def scope_value_changed?(document)
  Array.wrap(options[:scope]).any? do |item|
    document.send("attribute_changed?", item.to_s)
  end
end
skip_validation?(document) click to toggle source

Should validation be skipped?

@api private

@example Should the validation be skipped?

validator.skip_validation?(doc)

@param [ Document ] document The embedded document.

@return [ true, false ] If the validation should be skipped.

@since 2.3.0

# File lib/mongoid/validatable/uniqueness.rb, line 186
def skip_validation?(document)
  !document._parent || document.embedded_one?
end
to_validate(document, attribute, value) click to toggle source

Get the name of the field and the value to validate. This is for the case when we validate a relation via the relation name and not the key, we need to send the key name and value to the db, not the relation object.

@api private

@example Get the name and key to validate.

validator.to_validate(doc, :parent, Parent.new)

@param [ Document ] document The doc getting validated. @param [ Symbol ] attribute The attribute getting validated. @param [ Object ] value The value of the attribute.

@return [ Array<Object, Object> ] The field and value.

@since 2.4.4

# File lib/mongoid/validatable/uniqueness.rb, line 225
def to_validate(document, attribute, value)
  association = document.relations[attribute.to_s]
  if association && association.stores_foreign_key?
    [ association.foreign_key, value && value._id ]
  else
    [ attribute, value ]
  end
end
validate_embedded(document, attribute, value) click to toggle source

Validate an embedded document.

@api private

@example Validate the embedded document.

validator.validate_embedded(doc, :name, "test")

@param [ Document ] document The document. @param [ Symbol ] attribute The attribute name. @param [ Object ] value The value.

@since 2.4.10

# File lib/mongoid/validatable/uniqueness.rb, line 246
def validate_embedded(document, attribute, value)
  return if skip_validation?(document)
  relation = document._parent.send(document.association_name)
  criteria = create_criteria(relation, document, attribute, value)
  criteria = criteria.merge(options[:conditions].call) if options[:conditions]
  add_error(document, attribute, value) if criteria.count > 1
end
validate_root(document, attribute, value) click to toggle source

Validate a root document.

@api private

@example Validate the root document.

validator.validate_root(doc, :name, "test")

@param [ Document ] document The document. @param [ Symbol ] attribute The attribute name. @param [ Object ] value The value.

@since 2.4.10

# File lib/mongoid/validatable/uniqueness.rb, line 266
def validate_root(document, attribute, value)
  klass = document.class

  while klass.superclass.respond_to?(:validators) && klass.superclass.validators.include?(self)
    klass = klass.superclass
  end
  criteria = create_criteria(klass, document, attribute, value)
  criteria = criteria.merge(options[:conditions].call) if options[:conditions]

  if criteria.read(mode: :primary).exists?
    add_error(document, attribute, value)
  end
end
validation_required?(document, attribute) click to toggle source

Are we required to validate the document?

@example Is validation needed?

validator.validation_required?(doc, :field)

@param [ Document ] document The document getting validated. @param [ Symbol ] attribute The attribute to validate.

@return [ true, false ] If we need to validate.

@since 2.4.4

# File lib/mongoid/validatable/uniqueness.rb, line 291
def validation_required?(document, attribute)
  document.new_record? ||
    document.send("attribute_changed?", attribute.to_s) ||
    scope_value_changed?(document)
end