Fix error when assigning NaN to an integer column

Also covers any non-castable case by returning nil, which
is in-line with the intention of the former implementation,
but covers the odd cases which respond to to_i but raise
an error when it's called, such as NaN, Infinity and -Infinity.

Fixes #8757

Backport of #8781

Conflicts:
	activerecord/CHANGELOG.md
	activerecord/test/cases/column_test.rb

3 files changed, 11 insertions, 8 deletions

diff --git a/activerecord/CHANGELOG.md b/activerecord/CHANGELOG.md
index 1606b1a9f6..495390d16c 100644
--- a/activerecord/CHANGELOG.md
+++ b/activerecord/CHANGELOG.md
@@ -1,9 +1,10 @@
 ## Rails 3.2.11 (unreleased)
 
-*   Fix undefined method `to_i` when calling `new` on a scope that uses an Array.
-    Fixes #8718.
+*   Fix undefined method `to_i` when calling `new` on a scope that uses an
+    Array; Fix FloatDomainError when setting integer column to NaN.
+    Fixes #8718, #8734, #8757.
 
-    *Jason Stirk*
+    *Jason Stirk + Tristan Harward*
 
 *   Serialized attributes can be serialized in integer columns.
     Fix #8575.
diff --git a/activerecord/lib/active_record/connection_adapters/column.rb b/activerecord/lib/active_record/connection_adapters/column.rb
index b93a728a39..e22d9f7222 100644
--- a/activerecord/lib/active_record/connection_adapters/column.rb
+++ b/activerecord/lib/active_record/connection_adapters/column.rb
@@ -175,11 +175,7 @@ module ActiveRecord
           when TrueClass, FalseClass
             value ? 1 : 0
           else
-            if value.respond_to?(:to_i)
-              value.to_i
-            else
-              nil
-            end
+            value.to_i rescue nil
           end
         end
 
diff --git a/activerecord/test/cases/column_test.rb b/activerecord/test/cases/column_test.rb
index 8017a49827..77647d7986 100644
--- a/activerecord/test/cases/column_test.rb
+++ b/activerecord/test/cases/column_test.rb
@@ -56,6 +56,12 @@ module ActiveRecord
         column = Column.new("field", nil, "integer")
         assert_nil column.type_cast(Object.new)
       end
+
+      def test_type_cast_nan_and_infinity_to_integer
+        column = Column.new("field", nil, "integer")
+        assert_nil column.type_cast(Float::NAN)
+        assert_nil column.type_cast(1.0/0.0)
+      end
     end
   end
 end