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Methods
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Attributes
[R] limit
[R] precision
[R] scale
Class Public methods
new(precision: nil, limit: nil, scale: nil)
# File activemodel/lib/active_model/type/value.rb, line 7
def initialize(precision: nil, limit: nil, scale: nil)
  @precision = precision
  @scale = scale
  @limit = limit
end
Instance Public methods
==(other)
Also aliased as: eql?
# File activemodel/lib/active_model/type/value.rb, line 96
def ==(other)
  self.class == other.class &&
    precision == other.precision &&
    scale == other.scale &&
    limit == other.limit
end
assert_valid_value(*)
# File activemodel/lib/active_model/type/value.rb, line 108
def assert_valid_value(*)
end
cast(value)

Type casts a value from user input (e.g. from a setter). This value may be a string from the form builder, or a ruby object passed to a setter. There is currently no way to differentiate between which source it came from.

The return value of this method will be returned from ActiveRecord::AttributeMethods::Read#read_attribute. See also: #cast_value.

value The raw input, as provided to the attribute setter.

# File activemodel/lib/active_model/type/value.rb, line 36
def cast(value)
  cast_value(value) unless value.nil?
end
changed?(old_value, new_value, _new_value_before_type_cast)

Determines whether a value has changed for dirty checking. old_value and new_value will always be type-cast. Types should not need to override this method.

# File activemodel/lib/active_model/type/value.rb, line 63
def changed?(old_value, new_value, _new_value_before_type_cast)
  old_value != new_value
end
changed_in_place?(raw_old_value, new_value)

Determines whether the mutable value has been modified since it was read. Returns false by default. If your type returns an object which could be mutated, you should override this method. You will need to either:

  • pass new_value to #serialize and compare it to raw_old_value

or

  • pass raw_old_value to #deserialize and compare it to new_value

raw_old_value The original value, before being passed to deserialize.

new_value The current value, after type casting.

# File activemodel/lib/active_model/type/value.rb, line 84
def changed_in_place?(raw_old_value, new_value)
  false
end
deserialize(value)

Converts a value from database input to the appropriate ruby type. The return value of this method will be returned from ActiveRecord::AttributeMethods::Read#read_attribute. The default implementation just calls #cast.

value The raw input, as provided from the database.

# File activemodel/lib/active_model/type/value.rb, line 22
def deserialize(value)
  cast(value)
end
eql?(other)
Alias for: ==
hash()
# File activemodel/lib/active_model/type/value.rb, line 104
def hash
  [self.class, precision, scale, limit].hash
end
serialize(value)

Casts a value from the ruby type to a type that the database knows how to understand. The returned value from this method should be a String, Numeric, Date, Time, Symbol, true, false, or nil.

# File activemodel/lib/active_model/type/value.rb, line 44
def serialize(value)
  value
end
Instance Private methods
cast_value(value)

Convenience method for types which do not need separate type casting behavior for user and database inputs. Called by #cast for values except nil.

# File activemodel/lib/active_model/type/value.rb, line 116
def cast_value(value) # :doc:
  value
end