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.unscoped

  table_name   = record.class.quoted_table_name

  if value && record.class.serialized_attributes.key?(attribute.to_s)
    value = YAML.dump value
  end

  sql, params  = mount_sql_and_params(finder_class, table_name, attribute, value)

  relation = table.where(sql, *params)

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

  if record.persisted?
    # CPK
    if record.composite?
      predicate = nil
      record.ids_hash.each do |key, value|
        neq = relation.table[key].not_eq(value)
        predicate = predicate ? predicate.and(neq) : neq
      end
      relation = relation.where(predicate)
    else
      # TODO : This should be in Arel
      relation = relation.where("#{record.class.quoted_table_name}.#{record.class.primary_key} <> ?", record.send(:id))
    end
  end

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