ruby datamapper - rspec - why is "eql" matcher adding data to collection -

i have 2 specs. both test data common before(:all) block. if run both, second 1 fails.

putting in logging statements, seems week 1 being added @h_1 twice - happening?

it seems somewhere in first block. if comment out first, second 1 passes. don't understand is, in syntax saying 2 add @w_1 @h_1 twice?

require 'data_mapper'  datamapper::setup(:default, "sqlite3://#{dir.pwd}../data/prod.db")  class hobby      include datamapper::resource      property :id, string, :key => true      has n, :weeks, :through => resource  end  class week      include datamapper::resource      property :id, integer, :key => true      has n, :hobbys, :through => resource  end  datamapper.finalize.auto_migrate!  describe "hobby"      before(:all){          @h_1 = hobby.create(:id => "zombies")         @w_1 = week.create(:id => 1)         @w_2 = week.create(:id => 2)         @h_1.weeks << @w_1         @h_1.weeks << @w_2         @h_1.save      }      context "when week added hobby"          subject {   @h_1.weeks[0]   }          "should stored in 'weeks' property of hobby"              should eql @w_1 #if comment out spec below pass          end      end      context "when week added hobby"          "hobby should have 2 weeks"              @h_1.weeks.length.should eql 2             @h_1.weeks.first(:id => 2).should_not eql nil          end       end  end