Class: ActiveRecord::Validations::UniquenessValidator

Inherits:
ActiveModel::EachValidator show all
Defined in:
activerecord/lib/active_record/validations/uniqueness.rb

Instance Attribute Summary

Attributes inherited from ActiveModel::EachValidator

#attributes

Attributes inherited from ActiveModel::Validator

#options

Instance Method Summary collapse

Methods inherited from ActiveModel::EachValidator

#check_validity!, #validate

Methods inherited from ActiveModel::Validator

kind, #kind, #validate

Constructor Details

#initialize(options) ⇒ UniquenessValidator

Returns a new instance of UniquenessValidator.



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# File 'activerecord/lib/active_record/validations/uniqueness.rb', line 6

def initialize(options)
  super(options.reverse_merge(:case_sensitive => true))
end

Instance Method Details

#setup(klass) ⇒ Object

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



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# File 'activerecord/lib/active_record/validations/uniqueness.rb', line 11

def setup(klass)
  @klass = klass
end

#validate_each(record, attribute, value) ⇒ Object 



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# File 'activerecord/lib/active_record/validations/uniqueness.rb', line 15

def validate_each(record, attribute, value)
  finder_class = find_finder_class_for(record)
  table = finder_class.arel_table

  coder = record.class.serialized_attributes[attribute.to_s]

  if value && coder
    value = coder.dump value
  end

  relation = build_relation(finder_class, table, attribute, value)
  relation = relation.and(table[finder_class.primary_key.to_sym].not_eq(record.send(:id))) if record.persisted?

  Array.wrap(options[:scope]).each do |scope_item|
    scope_value = record.send(scope_item)
    relation = relation.and(table[scope_item].eq(scope_value))
  end

  if finder_class.unscoped.where(relation).exists?
    record.errors.add(attribute, :taken, options.except(:case_sensitive, :scope).merge(:value => value))
  end
end