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@@ -415,23 +415,22 @@ module ThoughtBot # :nodoc:
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         end
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       end
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-      # Ensures that the has_and_belongs_to_many relationship exists.  
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+      # Ensures that the has_and_belongs_to_many relationship exists, and that the join
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+      # table is in place.
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       #
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       #   should_have_and_belong_to_many :posts, :cars
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       #
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-      # NOTE:  One thing this macro should test, but doesn't is that the join
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-      # table exists in the DB.  Please contact the author if you know of a DB
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-      # agnostic way of introspecting on the current schema.
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       def should_have_and_belong_to_many(*associations)
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         get_options!(associations)
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         klass = model_class
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         associations.each do |association|
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           should "should have and belong to many #{association}" do
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-            assert klass.reflect_on_association(association), 
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-                   "#{klass.name} does not have any relationship to #{association}"
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-            assert_equal :has_and_belongs_to_many, 
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-                         klass.reflect_on_association(association).macro
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+            reflection = klass.reflect_on_association(association)
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+            assert reflection, "#{klass.name} does not have any relationship to #{association}"
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+            assert_equal :has_and_belongs_to_many, reflection.macro
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+            table = reflection.options[:join_table]
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+            assert ::ActiveRecord::Base.connection.tables.include?(table), "table #{table} doesn't exist"
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           end
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         end
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       end