DateTimes are Dates, beware
datetime = DateTime.now date = datetime.to_date #or Date.today
datetime.is_a? Date == true datetime.is_a? DateTime == true datetime.instance_of? Date == false datetime.instance_of? DateTime == true
In case you have a table and a model like:
create_table :event do |t| t.date :day t.string :description end class Event < ActiveRecord::Base; end
And you say:
event = Event.new(:day => '2013-03-22')
Rails will convert the supplied value for day to the type of the database field, a Date.
BUT, if you say:
event = Event.new(:day => datetime)
Rails will not convert anything, and it will remain as a DateTime until it's persisted. Then the database will truncate the time information and will be saved as a date indeed.
Consider this if you have methods on your model that deal with dates, because if you provide a DateTime you could get unexpected results. You might force the type of the fields to Date upon assignment:
class Event < ActiveRecord::Base def day=(day) @day = day.to_date end end