pg, disable_referential_integrity only catches AR errors.

This change was prompted by 598b841.

activerecord/lib/active_record/connection_adapters/postgresql/referential_integrity.rb

@@ -14,7 +14,7 @@ module ActiveRecord
               transaction(requires_new: true) do
                 execute(tables.collect { |name| "ALTER TABLE #{quote_table_name(name)} DISABLE TRIGGER ALL" }.join(";"))
               end
-            rescue => e
+            rescue ActiveRecord::ActiveRecordError => e
               original_exception = e
             end
 
@@ -37,7 +37,7 @@ Rails needs superuser privileges to disable referential integrity.
               transaction(requires_new: true) do
                 execute(tables.collect { |name| "ALTER TABLE #{quote_table_name(name)} ENABLE TRIGGER ALL" }.join(";"))
               end
-            rescue
+            rescue ActiveRecord::ActiveRecordError
             end
           else
             yield

activerecord/test/cases/adapters/postgresql/referential_integrity_test.rb

@@ -6,9 +6,13 @@ class PostgreSQLReferentialIntegrityTest < ActiveRecord::TestCase
 
   include ConnectionHelper
 
+  IS_REFERENTIAL_INTEGRITY_SQL = lambda do |sql|
+    sql.match(/DISABLE TRIGGER ALL/) || sql.match(/ENABLE TRIGGER ALL/)
+  end
+
   module MissingSuperuserPrivileges
     def execute(sql)
-      if sql.match(/DISABLE TRIGGER ALL/) || sql.match(/ENABLE TRIGGER ALL/)
+      if IS_REFERENTIAL_INTEGRITY_SQL.call(sql)
         super "BROKEN;" rescue nil # put transaction in broken state
         raise ActiveRecord::StatementInvalid, 'PG::InsufficientPrivilege'
       else
@@ -17,6 +21,16 @@ class PostgreSQLReferentialIntegrityTest < ActiveRecord::TestCase
     end
   end
 
+  module ProgrammerMistake
+    def execute(sql)
+      if IS_REFERENTIAL_INTEGRITY_SQL.call(sql)
+        raise ArgumentError, 'something is not right.'
+      else
+        super
+      end
+    end
+  end
+
   def setup
     @connection = ActiveRecord::Base.connection
   end
@@ -81,6 +95,14 @@ class PostgreSQLReferentialIntegrityTest < ActiveRecord::TestCase
     end
   end
 
+  def test_only_catch_active_record_errors_others_bubble_up
+    @connection.extend ProgrammerMistake
+
+    assert_raises ArgumentError do
+      @connection.disable_referential_integrity {}
+    end
+  end
+
   private
 
   def assert_transaction_is_not_broken