CODEWITHSUNDEEP
ruby-on-railsdatetimeactiverecord
Sungpah Lee
Sungpah Lee

Reputation: 1021

Datetime format in Ruby doesn't work for identifier

I have a question about the format of t.datetime.

When I command in the rails console, 

Lesson.find(1781).start_time,

then

the Tue, 03 May 2016 14:00:00 UTC +00:00

is returned.

If I command

Classtime.find_by(start_time: 'Tue, 03 May 2016 14:00:00 UTC +00:00')

, it returns nil.

But if I command

Classtime.find_by(start_time: Lesson.find(1781).start_time)

, it returns 

<Classtime id: 4429, start_time: "2016-05-03 14:00:00", created_at: "2016-04-21 15:53:22", updated_at: "2016-04-21 15:53:22">

So I guess, Lesson.find(1781).start_time is not equal to the return of Lesson.find(1781).start_time in some sense. How would I be able to know what caused this?

Please share with me!!!

Upvotes: 0

Views: 55

Answers (1)

GoGoCarl
GoGoCarl

Reputation: 2519

This:

Classtime.find_by(start_time: Lesson.find(1781).start_time)

is the same as:

Classtime.find_by(start_time: '2016-05-03 14:00:00')

which is NOT the same as:

Classtime.find_by(start_time: 'Tue, 03 May 2016 14:00:00 UTC +00:00')

The database knows how to translate the string 2016-05-03 14:00:00 to a date, but not the string Tue, 03 May 2016 14:00:00 UTC +00:00.

Upvotes: 2

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