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module ActiveRecord
module Type
class Value # :nodoc:
attr_reader :precision, :scale, :limit
# Valid options are +precision+, +scale+, and +limit+.
# They are only used when dumping schema.
def initialize(options = {})
options.assert_valid_keys(:precision, :scale, :limit)
@precision = options[:precision]
@scale = options[:scale]
@limit = options[:limit]
end
# The simplified type that this object represents. Subclasses
# must override this method.
def type; end
def type_cast_from_database(value)
type_cast(value)
end
def type_cast_from_user(value)
type_cast(value)
end
def type_cast_for_database(value)
value
end
def type_cast_for_schema(value)
value.inspect
end
def text?
false
end
def number?
false
end
def binary?
false
end
def serialized?
false
end
def klass # :nodoc:
end
# +old_value+ will always be type-cast.
# +new_value+ will come straight from the database
# or from assignment, so it could be anything. Types
# which cannot typecast arbitrary values should override
# this method.
def changed?(old_value, new_value, _new_value_before_type_cast) # :nodoc:
old_value != new_value
end
def changed_in_place?(*) # :nodoc:
false
end
private
# Takes an input from the database, or from attribute setters,
# and casts it to a type appropriate for this object. This method
# should not be overriden by subclasses. Instead, override `cast_value`.
def type_cast(value) # :api: public
cast_value(value) unless value.nil?
end
# Responsible for casting values from external sources to the appropriate
# type. Called by `type_cast` for all values except `nil`.
def cast_value(value) # :api: public
value
end
end
end
end
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