From b61a93b44e11046cc28605a8b4d2d17fe89927fd Mon Sep 17 00:00:00 2001
From: Ryuta Kamizono <kamipo@gmail.com>
Date: Thu, 27 Nov 2014 10:06:49 +0900
Subject: Fix undesirable RangeError by Type::Integer. Add
 Type::UnsignedInteger.

---
 .../connection_adapters/abstract_mysql_adapter.rb   | 21 ++++++++++++++++-----
 activerecord/lib/active_record/type.rb              |  1 +
 activerecord/lib/active_record/type/integer.rb      |  6 +++++-
 .../lib/active_record/type/unsigned_integer.rb      | 15 +++++++++++++++
 4 files changed, 37 insertions(+), 6 deletions(-)
 create mode 100644 activerecord/lib/active_record/type/unsigned_integer.rb

(limited to 'activerecord/lib')

diff --git a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
index a741314ac6..69582ebb6f 100644
--- a/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
+++ b/activerecord/lib/active_record/connection_adapters/abstract_mysql_adapter.rb
@@ -656,14 +656,15 @@ module ActiveRecord
         m.register_type %r(mediumblob)i, Type::Binary.new(limit: 2**24 - 1)
         m.register_type %r(longtext)i,   Type::Text.new(limit: 2**32 - 1)
         m.register_type %r(longblob)i,   Type::Binary.new(limit: 2**32 - 1)
-        m.register_type %r(^bigint)i,    Type::Integer.new(limit: 8)
-        m.register_type %r(^int)i,       Type::Integer.new(limit: 4)
-        m.register_type %r(^mediumint)i, Type::Integer.new(limit: 3)
-        m.register_type %r(^smallint)i,  Type::Integer.new(limit: 2)
-        m.register_type %r(^tinyint)i,   Type::Integer.new(limit: 1)
         m.register_type %r(^float)i,     Type::Float.new(limit: 24)
         m.register_type %r(^double)i,    Type::Float.new(limit: 53)
 
+        register_integer_type m, %r(^bigint)i,    limit: 8
+        register_integer_type m, %r(^int)i,       limit: 4
+        register_integer_type m, %r(^mediumint)i, limit: 3
+        register_integer_type m, %r(^smallint)i,  limit: 2
+        register_integer_type m, %r(^tinyint)i,   limit: 1
+
         m.alias_type %r(tinyint\(1\))i,  'boolean' if emulate_booleans
         m.alias_type %r(set)i,           'varchar'
         m.alias_type %r(year)i,          'integer'
@@ -676,6 +677,16 @@ module ActiveRecord
         end
       end
 
+      def register_integer_type(mapping, key, options) # :nodoc:
+        mapping.register_type(key) do |sql_type|
+          if /unsigned/i =~ sql_type
+            Type::UnsignedInteger.new(options)
+          else
+            Type::Integer.new(options)
+          end
+        end
+      end
+
       # MySQL is too stupid to create a temporary table for use subquery, so we have
       # to give it some prompting in the form of a subsubquery. Ugh!
       def subquery_for(key, select)
diff --git a/activerecord/lib/active_record/type.rb b/activerecord/lib/active_record/type.rb
index e5acbbb6b3..250e8d5b23 100644
--- a/activerecord/lib/active_record/type.rb
+++ b/activerecord/lib/active_record/type.rb
@@ -17,6 +17,7 @@ require 'active_record/type/serialized'
 require 'active_record/type/string'
 require 'active_record/type/text'
 require 'active_record/type/time'
+require 'active_record/type/unsigned_integer'
 
 require 'active_record/type/type_map'
 require 'active_record/type/hash_lookup_type_map'
diff --git a/activerecord/lib/active_record/type/integer.rb b/activerecord/lib/active_record/type/integer.rb
index 750f353472..fc260a081a 100644
--- a/activerecord/lib/active_record/type/integer.rb
+++ b/activerecord/lib/active_record/type/integer.rb
@@ -5,7 +5,7 @@ module ActiveRecord
 
       def initialize(*)
         super
-        @range = -max_value...max_value
+        @range = min_value...max_value
       end
 
       def type
@@ -46,6 +46,10 @@ module ActiveRecord
         limit = self.limit || 4
         1 << (limit * 8 - 1) # 8 bits per byte with one bit for sign
       end
+
+      def min_value
+        -max_value
+      end
     end
   end
 end
diff --git a/activerecord/lib/active_record/type/unsigned_integer.rb b/activerecord/lib/active_record/type/unsigned_integer.rb
new file mode 100644
index 0000000000..ed3e527483
--- /dev/null
+++ b/activerecord/lib/active_record/type/unsigned_integer.rb
@@ -0,0 +1,15 @@
+module ActiveRecord
+  module Type
+    class UnsignedInteger < Integer # :nodoc:
+      private
+
+      def max_value
+        super * 2
+      end
+
+      def min_value
+        0
+      end
+    end
+  end
+end
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