Add `ActiveRecord::ValueTooLong` exception class

activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb

@@ -741,6 +741,8 @@ def translate_exception(exception, message)
           RecordNotUnique.new(message)
         when 1452
           InvalidForeignKey.new(message)
+        when 1406
+          ValueTooLong.new(message)
         else
           super
         end

activerecord/lib/active_record/connection_adapters/postgresql_adapter.rb

@@ -398,6 +398,7 @@ def postgresql_version
       protected
 
         # See http://www.postgresql.org/docs/current/static/errcodes-appendix.html
+        VALUE_LIMIT_VIOLATION = "22001"
         FOREIGN_KEY_VIOLATION = "23503"
         UNIQUE_VIOLATION      = "23505"
 
@@ -409,6 +410,8 @@ def translate_exception(exception, message)
             RecordNotUnique.new(message)
           when FOREIGN_KEY_VIOLATION
             InvalidForeignKey.new(message)
+          when VALUE_LIMIT_VIOLATION
+            ValueTooLong.new(message)
           else
             super
           end

activerecord/lib/active_record/errors.rb

@@ -125,6 +125,10 @@ class RecordNotUnique < WrappedDatabaseException
   class InvalidForeignKey < WrappedDatabaseException
   end
 
+  # Raised when a record cannot be inserted or updated because a value too long for a column type.
+  class ValueTooLong < StatementInvalid
+  end
+
   # Raised when number of bind variables in statement given to +:condition+ key
   # (for example, when using {ActiveRecord::Base.find}[rdoc-ref:FinderMethods#find] method)
   # does not match number of expected values supplied.

activerecord/test/cases/adapter_test.rb

@@ -2,6 +2,7 @@
 require "models/book"
 require "models/post"
 require "models/author"
+require "models/event"
 
 module ActiveRecord
   class AdapterTest < ActiveRecord::TestCase
@@ -193,6 +194,14 @@ def test_foreign_key_violations_are_translated_to_specific_exception_with_valida
 
         assert_not_nil error.cause
       end
+
+      def test_value_limit_violations_are_translated_to_specific_exception
+        error = assert_raises(ActiveRecord::ValueTooLong) do
+          Event.create(title: 'abcdefgh')
+        end
+
+        assert_not_nil error.cause
+      end
     end
 
     def test_disable_referential_integrity