Active Model Integer Type

Attribute type for integer representation. This type is registered under the :integer key.

class Person
  include ActiveModel::Attributes

  attribute :age, :integer
end

Values are cast using their to_i method, except for blank strings, which are cast to nil. If a to_i method is not defined or raises an error, the value will be cast to nil.

person = Person.new

person.age = "18"
person.age # => 18

person.age = ""
person.age # => nil

person.age = :not_an_integer
person.age # => nil (because Symbol does not define #to_i)

Serialization also works under the same principle. Non-numeric strings are serialized as nil, for example.

Serialization also validates that the integer can be stored using a limited number of bytes. If it cannot, an ActiveModel::RangeError will be raised. The default limit is 4 bytes, and can be customized when declaring an attribute:

class Person
  include ActiveModel::Attributes

  attribute :age, :integer, limit: 6
end

Methods

Included Modules

Constants

DEFAULT_LIMIT = 4
 

Column storage size in bytes. 4 bytes means an integer as opposed to smallint etc.

Class Public methods

new(**)

📝 Source code 
# File activemodel/lib/active_model/type/integer.rb, line 52
      def initialize(**)
        super
        @max = max_value
        @min = min_value
      end
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Instance Public methods

deserialize(value)

📝 Source code 
# File activemodel/lib/active_model/type/integer.rb, line 62
      def deserialize(value)
        return if value.blank?
        value.to_i
      end
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serializable?(value)

📝 Source code 
# File activemodel/lib/active_model/type/integer.rb, line 96
      def serializable?(value)
        cast_value = cast(value)
        return true unless out_of_range?(cast_value)
        yield cast_value if block_given?
        false
      end
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serialize(value)

📝 Source code 
# File activemodel/lib/active_model/type/integer.rb, line 67
      def serialize(value)
        case value
        when ::Integer
          # noop
        when ::String
          int = value.to_i
          if int.zero? && value != "0"
            return if non_numeric_string?(value)
          end
          value = int
        else
          value = super
        end

        if out_of_range?(value)
          raise ActiveModel::RangeError, "#{value} is out of range for #{self.class} with limit #{_limit} bytes"
        end

        value
      end
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type()

📝 Source code 
# File activemodel/lib/active_model/type/integer.rb, line 58
      def type
        :integer
      end
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