Module: ActiveRecord::Validations::ClassMethods

Defined in:
lib/rails2_ruby2/downcase_patch.rb

Instance Method Summary collapse

Instance Method Details

#validates_uniqueness_of(*attr_names) ⇒ Object 



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# File 'lib/rails2_ruby2/downcase_patch.rb', line 16

def validates_uniqueness_of(*attr_names)
  configuration = { :case_sensitive => true }
  configuration.update(attr_names.extract_options!)

  validates_each(attr_names,configuration) do |record, attr_name, value|
    # The check for an existing value should be run from a class that
    # isn't abstract. This means working down from the current class
    # (self), to the first non-abstract class. Since classes don't know
    # their subclasses, we have to build the hierarchy between self and
    # the record's class.
    class_hierarchy = [record.class]
    while class_hierarchy.first != self
      class_hierarchy.insert(0, class_hierarchy.first.superclass)
    end

    # Now we can work our way down the tree to the first non-abstract
    # class (which has a database table to query from).
    finder_class = class_hierarchy.detect { |klass| !klass.abstract_class? }

    column = finder_class.columns_hash[attr_name.to_s]

    if value.nil?
      comparison_operator = "IS ?"
    elsif column.text?
      comparison_operator = "#{connection.case_sensitive_equality_operator} ?"
      value = column.limit ? value.to_s.mb_chars[0, column.limit] : value.to_s
    else
      comparison_operator = "= ?"
    end

    sql_attribute = "#{record.class.quoted_table_name}.#{connection.quote_column_name(attr_name)}"

    if value.nil? || (configuration[:case_sensitive] || !column.text?)
      condition_sql = "#{sql_attribute} #{comparison_operator}"
      condition_params = [value]
    else
      condition_sql = "LOWER(#{sql_attribute}) #{comparison_operator}"
      condition_params = [value._mb_chars_downcase]
    end

    if scope = configuration[:scope]
      Array(scope).map do |scope_item|
        scope_value = record.send(scope_item)
        condition_sql << " AND " << attribute_condition("#{record.class.quoted_table_name}.#{connection.quote_column_name(scope_item)}", scope_value)
        condition_params << scope_value
      end
    end

    unless record.new_record?
      condition_sql << " AND #{record.class.quoted_table_name}.#{record.class.primary_key} <> ?"
      condition_params << record.send(:id)
    end

    finder_class.with_exclusive_scope do
      if finder_class.exists?([condition_sql, *condition_params])
        record.errors.add(attr_name, :taken, :default => configuration[:message], :value => value)
      end
    end
  end
end