From 9cc8c6f3730df3d94c81a55be9ee1b7b4ffd29f6 Mon Sep 17 00:00:00 2001
From: Kir Shatrov <shatrov@me.com>
Date: Mon, 7 Sep 2015 21:20:15 +0300
Subject: Move ActiveRecord::Type to ActiveModel The first step of bringing
 typecasting to ActiveModel

---
 activemodel/lib/active_model/type/integer.rb | 66 ++++++++++++++++++++++++++++
 1 file changed, 66 insertions(+)
 create mode 100644 activemodel/lib/active_model/type/integer.rb

(limited to 'activemodel/lib/active_model/type/integer.rb')

diff --git a/activemodel/lib/active_model/type/integer.rb b/activemodel/lib/active_model/type/integer.rb
new file mode 100644
index 0000000000..2f73ede009
--- /dev/null
+++ b/activemodel/lib/active_model/type/integer.rb
@@ -0,0 +1,66 @@
+module ActiveModel
+  module Type
+    class Integer < Value # :nodoc:
+      include Helpers::Numeric
+
+      # Column storage size in bytes.
+      # 4 bytes means a MySQL int or Postgres integer as opposed to smallint etc.
+      DEFAULT_LIMIT = 4
+
+      def initialize(*)
+        super
+        @range = min_value...max_value
+      end
+
+      def type
+        :integer
+      end
+
+      def deserialize(value)
+        return if value.nil?
+        value.to_i
+      end
+
+      def serialize(value)
+        result = cast(value)
+        if result
+          ensure_in_range(result)
+        end
+        result
+      end
+
+      protected
+
+      attr_reader :range
+
+      private
+
+      def cast_value(value)
+        case value
+        when true then 1
+        when false then 0
+        else
+          value.to_i rescue nil
+        end
+      end
+
+      def ensure_in_range(value)
+        unless range.cover?(value)
+          raise RangeError, "#{value} is out of range for #{self.class} with limit #{_limit}"
+        end
+      end
+
+      def max_value
+        1 << (_limit * 8 - 1) # 8 bits per byte with one bit for sign
+      end
+
+      def min_value
+        -max_value
+      end
+
+      def _limit
+        self.limit || DEFAULT_LIMIT
+      end
+    end
+  end
+end
-- 
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