Fixture Inserts Use Model's Connection

[metaskills]

Make sure work in master handles fixtures to secondbase models.

[metaskills]

@hmadison Had a great idea to solve this by tracking SecondBase descendants and calling set_fixture_class with the right data/tablename.

[metaskills]

Here is an example of tracking subclasses that Rails::Railtie does too.

class << self
  def subclasses
    @subclasses ||= []
  end

  def inherited(base)
    unless base.abstract_railtie?
      subclasses << base
    end
  end
end

[metaskills]

When doing this, we should also consider doing a freedom method chain wrapped with a nice SecondBase::Base.connection.disable_referential_integrity { ... } block call.