diff options
Diffstat (limited to 'activerecord/lib/active_record/type/integer.rb')
-rw-r--r-- | activerecord/lib/active_record/type/integer.rb | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/type/integer.rb b/activerecord/lib/active_record/type/integer.rb new file mode 100644 index 0000000000..750f353472 --- /dev/null +++ b/activerecord/lib/active_record/type/integer.rb @@ -0,0 +1,51 @@ +module ActiveRecord + module Type + class Integer < Value # :nodoc: + include Numeric + + def initialize(*) + super + @range = -max_value...max_value + end + + def type + :integer + end + + alias type_cast_for_database type_cast + + def type_cast_from_database(value) + return if value.nil? + value.to_i + end + + protected + + attr_reader :range + + private + + def cast_value(value) + case value + when true then 1 + when false then 0 + else + result = value.to_i rescue nil + ensure_in_range(result) if result + result + end + end + + def ensure_in_range(value) + unless range.cover?(value) + raise RangeError, "#{value} is out of range for #{self.class} with limit #{limit || 4}" + end + end + + def max_value + limit = self.limit || 4 + 1 << (limit * 8 - 1) # 8 bits per byte with one bit for sign + end + end + end +end |