Dont swallow errors when bad alias_method

3 files changed, 27 insertions, 10 deletions

diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index 6fc770d293..bfec8676d2 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,3 +1,8 @@
+*   Dont swallow errors on compute_type when having a bad alias_method on
+    a class.
+
+    *arthurnn*
+
 *   Assume numeric types have changed if they were assigned to a value that
     would fail numericality validation, regardless of the old value. Previously
     this would only occur if the old value was 0.
diff --git a/activerecord/lib/active_record/inheritance.rb b/activerecord/lib/active_record/inheritance.rb
index 08fc91c9df..17cec08628 100644
--- a/activerecord/lib/active_record/inheritance.rb
+++ b/activerecord/lib/active_record/inheritance.rb
@@ -120,14 +120,8 @@ module ActiveRecord
           candidates << type_name
 
           candidates.each do |candidate|
-            begin
-              constant = ActiveSupport::Dependencies.constantize(candidate)
-              return constant if candidate == constant.to_s
-            # We don't want to swallow NoMethodError < NameError errors
-            rescue NoMethodError
-              raise
-            rescue NameError
-            end
+            constant = ActiveSupport::Dependencies.safe_constantize(candidate)
+            return constant if candidate == constant.to_s
           end
 
           raise NameError.new("uninitialized constant #{candidates.first}", candidates.first)
diff --git a/activerecord/test/cases/base_test.rb b/activerecord/test/cases/base_test.rb
index 8f83cf7cb4..4c0b0c868a 100644
--- a/activerecord/test/cases/base_test.rb
+++ b/activerecord/test/cases/base_test.rb
@@ -1347,14 +1347,32 @@ class BasicsTest < ActiveRecord::TestCase
   end
 
   def test_compute_type_no_method_error
-    ActiveSupport::Dependencies.stubs(:constantize).raises(NoMethodError)
+    ActiveSupport::Dependencies.stubs(:safe_constantize).raises(NoMethodError)
     assert_raises NoMethodError do
       ActiveRecord::Base.send :compute_type, 'InvalidModel'
     end
   end
 
+  def test_compute_type_on_undefined_method
+    error = nil
+    begin
+      Class.new(Author) do
+        alias_method :foo, :bar
+      end
+    rescue => e
+      error = e
+    end
+
+    ActiveSupport::Dependencies.stubs(:safe_constantize).raises(e)
+
+    exception = assert_raises NameError do
+      ActiveRecord::Base.send :compute_type, 'InvalidModel'
+    end
+    assert_equal error.message, exception.message
+  end
+
   def test_compute_type_argument_error
-    ActiveSupport::Dependencies.stubs(:constantize).raises(ArgumentError)
+    ActiveSupport::Dependencies.stubs(:safe_constantize).raises(ArgumentError)
     assert_raises ArgumentError do
       ActiveRecord::Base.send :compute_type, 'InvalidModel'
     end