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@@ -317,14 +317,14 @@ module ThoughtBot # :nodoc:
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       #
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       #   should_belong_to :parent
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       def should_belong_to(*associations)
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-        fk = get_options!(associations, :foreign_key)
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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 "belong_to #{association}" do
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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 :belongs_to, reflection.macro
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-            fk ||= (reflection.options[:foreign_key] || "#{association}_id")
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+            fk = reflection.options[:foreign_key] || "#{association}_id"
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             assert klass.column_names.include?(fk), "#{klass.name} does not have a #{fk} foreign key."
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           end
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         end

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@@ -3,6 +3,6 @@ require File.dirname(__FILE__) + '/../test_helper'
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 class TaggingTest < Test::Unit::TestCase
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   load_all_fixtures
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-  should_belong_to :post, :foreign_key
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+  should_belong_to :post
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   should_belong_to :tag
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 end