Rails 3 DateTime Comparison w/ Date In An ActiveRecord Query

Question

I\'m trying to search a model for any dates equal to a specific date while omitting the timestamp. In Rails I could simply execute this as DateTime.to_date == somedate

Answer 1

DateTime class have two usefull methods to do this: beginning_of_day and end_of_day.

For this case, in which you have a Date object, you might do:

Foo.where('created_at >= #{Date.today.to_time.beginning_of_day} AND 
           created_at <= #{Date.today.to_time.end_of_day}')

Notice that you have to transform the Date object to a DateTime object

Answer 2

I would do something like...

someday = Date.today
Foo.where( :created_at => (someday)..(someday + 1.day) )

This would capture all created_at dates between midnight on someday and someday + 1. This is inclusive (so it would include a Foo created bang on midnight on the +1 day) but may be 'just good enough' for your needs without messing with timestamps.

For niceness, I would wrap it up as a scope

scope :on_day, ( lambda do |someday|
  where( :created_at => (someday)..(someday + 1.day) )
end )

So

Foo.on_day( Date.yesterday ).count

is nicely readable.

Answer 3

With scope:

scope :on_day, (lambda do |day|
   where(date: day.beginning_of_day..day.end_of_day)
end)

Using:

Foo.on_day(Date.today).count

Answer 4

Try created_at >= some_day_with_00:00:00 timestamp and create_at < some_day_plus_one_with_00:00:00 timestamp