在Rails的.where（）中比较日期时间和日期

Question

I'm working on an event system where admins can select events to feature and add promotional text. As they need to add additional text the featured events are in their own table and reference the event details.

I'm now trying to output featured events for each day in the next week. Simplified example:

day = DateTime.now.to_date
featured_events = @featured_events.where('event.start_datetime = ?', day)

The problem is that start_datetime is in datetime format and day is in date format so it always outputs nothing. Is it possible to compare these two values with .where() ?

Thanks!

Answer 1

You don't say what database you're using.

In PostgreSQL we'd truncate the datetime inside the DB query so the DBM can do the compare. On MySQL we'd use a function to convert the datetime to a date .

Answer 2

可能是您在寻找这个：

@featured_events.where('event.start_datetime > ? and event.start_datetime < ?', DateTime.now, 1.day.from_now.beginning_of_day)