Class: ActiveModel::Type::Decimal

Inherits:
Value show all
Includes:
Helpers::Numeric
Defined in:
activemodel/lib/active_model/type/decimal.rb

Overview

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

bag = BagOfCoffee.new
bag.weight = "0.0001"

bag.weight # => 0.1e-3

Numeric instances are converted to BigDecimal instances. Any other objects are cast using their to_d method, if it exists. If it does not exist, the object is converted to a string using to_s, which is then coerced to a BigDecimal using 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

Constant Summary collapse

BIGDECIMAL_PRECISION = 
18

Instance Attribute Summary

Attributes inherited from Value

#limit, #precision, #scale

Instance Method Summary collapse

Methods included from Helpers::Numeric

#cast, #changed?, #serialize

Methods inherited from Value

#==, #assert_valid_value, #binary?, #cast, #changed?, #changed_in_place?, #deserialize, #force_equality?, #hash, #initialize, #map, #serializable?, #serialize, #value_constructed_by_mass_assignment?

Constructor Details

This class inherits a constructor from ActiveModel::Type::Value

Instance Method Details

#type ⇒ Object 


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# File 'activemodel/lib/active_model/type/decimal.rb', line 38

def type
  :decimal
end

#type_cast_for_schema(value) ⇒ Object 


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# File 'activemodel/lib/active_model/type/decimal.rb', line 42

def type_cast_for_schema(value)
  value.to_s.inspect
end