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For example: I am inserting date 2011-06-01 (format mm/dd/yyyy) and now I want to add 8 months to this date. I want the result to be 2012-02-01.
So when adding months, the year may also increase.
Rails provides for + n.days, n.months, etc.
my_date + 8.months
This is an ActiveRecord, not a Ruby thing, though. So make sure it's loading thru Rails.
You can use the '>>' operator over a Date object to easily achieve just that, it returns a date object N (N being a number) months after the original.
In your case:
Date.new(2011,6,1) >> 8
That will return the date of 2012-02-01.
Likewise you can use '<<' in order to 'travel back in time'. ;)
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Currently, I have 3 columns : booking_date, booking_time_from, booking_time_to.
Problem is how can i get all data have booking time 2 hours ago using Active Support ?
Booking.where([booking_time], 2.hours.ago.to_datetime)
I'm not sure about what's the difference between booking_time_from and booking_time_to, and which column that the booking time you're referring here. Let's assume it's booking_time_to, you can
Booking.where("booking_time_to < ?", 2.hours.ago)
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I have saved data to fields in CloudKit and I have queried for the posts by date in decending order and by getting the one at index(0) I have the last post. My question is how do I separate out the various fields and use them to populate the text in various labels in my view. Here is what I have for the latest post query.
<CKRecord: 0x104e5b600; recordID=157F08E2-FF00-42DD-8B89-7CB10FAC81B6:(_defaultZone:__defaultOwner__), recordChangeTag=kk6d3s69, values={ temperature=54, trip=50, level=53, battery=64, date=1-20-2021 20:57:09 }, recordType=MyPoolInfo>
If someone could help me out I would appreciate it. Thanks
I figured this out. This is a dictionary. So I just called the following:
NSLog(#"temperature:%#",[dictionary objectForKey:#"temperature"]) ;
NSLog(#"date:%#",[dictionary objectForKey:#"date"]) ;
NSLog(#"trip:%#",[dictionary objectForKey:#"trip"]) ;
NSLog(#"battery:%#",[dictionary objectForKey:#"battery"]) ;
NSLog(#"level:%#",[dictionary objectForKey:#"level"]) ;
I could then fill in the label.text like this:
self.DateLabel.text =[dictionary objectForKey:#"date"];
in case anyone needs to know.
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I want to get the value of col B for the most recent date. The number of rows may change... i.e. oct isnt always the most recent date.
On dates u can use the MAX function. If you wrap this inside a VLOOKUP the MAX will get you the searchkey and the returns the value next to it.
=VLOOKUP(MAX(A1:A10),A1:B10,2,0)
With data in cols A and B, use:
=index(B:B,match(max(A:A),A:A,0))
As you see from the example, we don't even have to sort the data.
proper way:
=MAXIFS(B:B, A:A, MAX(A:A)
or:
=FILTER(B:B, A:A=MAX(A:A))
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I want to calculate the number of months between two dates. I want the result in decimal point. For example, if my date range is "2017-02-01" to "2017-03-1", then I am expecting the number of months to be something like 1.033 in decimal.
Please help.
You should be able to do something like this
#Mondel.time_diff_in_months("2017-03-01", "2017-02-01")
def time_diff_in_months(grater_date, lesser_date)
Time.at(grater_date.to_time - lesser_date.to_time).month # 1
end
I hope that this helps
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Sorry for my English. I have a model with some field.
How to add a number to a current value in field?
I want to add the number several times
i generated scaffold.I use this to create modal. But i want to add number to a current value when i clicked submit
#foo = Foo.first
#foo.bar += 10
#which is a shorter way of saying #foo.bar = #foo.bar + 10
#foo.save
If this isn't helpful, please add some more details to your question, eg your example code you have so far.