class Decimal

Active Model Decimal Type

Attribute type for decimal, high-precision floating point numeric representation. It is registered under the :decimal key.

“‘ class BagOfCoffee

include ActiveModel::Attributes

attribute :weight, :decimal

end “‘

Numeric instances are converted to BigDecimal instances. Any other objects are cast using their to_d method, except for blank strings, which are cast to nil. If a to_d method is not defined, the object is converted to a string using to_s, which is then cast using to_d.

“‘ bag = BagOfCoffee.new

bag.weight = 0.01 bag.weight # => 0.1e-1

bag.weight = “0.01” bag.weight # => 0.1e-1

bag.weight = “” bag.weight # => nil

bag.weight = :arbitrary bag.weight # => 0.0 (the result of .to_s.to_d) “‘

Decimal precision defaults to 18, and can be customized when declaring an attribute:

“‘ class BagOfCoffee

include ActiveModel::Attributes

attribute :weight, :decimal, precision: 24

end “‘