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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
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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: show 

# File activemodel/lib/active_model/type/integer.rb, line 51
def initialize(**)
  super
  @range = min_value...max_value
end

Instance Public methods

deserialize(value)

Source: show 

# File activemodel/lib/active_model/type/integer.rb, line 60
def deserialize(value)
  return if value.blank?
  value.to_i
end

serializable?(value)

Source: show 

# File activemodel/lib/active_model/type/integer.rb, line 74
def serializable?(value)
  cast_value = cast(value)
  in_range?(cast_value) || begin
    yield cast_value if block_given?
    false
  end
end

serialize(value)

Source: show 

# File activemodel/lib/active_model/type/integer.rb, line 65
def serialize(value)
  return if value.is_a?(::String) && non_numeric_string?(value)
  ensure_in_range(super)
end

type()

Source: show 

# File activemodel/lib/active_model/type/integer.rb, line 56
def type
  :integer
end