You don't need any callbacks, what you need are custom setter methods:
class DateRange
attr_reader :from, :to
def from=(value)
# implementation
end
def to=(value)
# implementation
end
end
문제
I am using an ActiveModel model DateRange
with attributes :from
and :to
and I want it to behave as follows..
d = DateRange.new
=> #<DateRange:0x0000010532d3f8>
d.from = "03/03/2010"
=> Wed, 03 Mar 2010
d.to = Date.today
=> Mon, 3 Mar 2014
In other words, whenever an attribute is set, if it is in string format it should be parsed into a date format.
Is there an ActiveModel callback function which will run immediately when an attribute is changed? If not, what would be best practice to do this?
해결책
You don't need any callbacks, what you need are custom setter methods:
class DateRange
attr_reader :from, :to
def from=(value)
# implementation
end
def to=(value)
# implementation
end
end