Class: ActiveRecord::Validations::UniquenessValidator

Inherits:
Object
  • Object
show all
Defined in:
lib/composite_primary_keys/validations/uniqueness.rb

Instance Method Summary collapse

Instance Method Details

#validate_each(record, attribute, value) ⇒ Object 



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# File 'lib/composite_primary_keys/validations/uniqueness.rb', line 4

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)
  # CPK
  # relation = relation.and(table[finder_class.primary_key.to_sym].not_eq(record.send(:id))) if record.persisted?
  if record.persisted?
    not_eq_conditions = Array(finder_class.primary_key).zip(Array(record.send(:id))).map do |name, value|
      table[name.to_sym].not_eq(value)
    end

    condition = not_eq_conditions.shift
    not_eq_conditions.each do |not_eq_condition|
      condition = condition.or(not_eq_conditions)
    end
    relation = relation.and(condition)
  end

  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