How to sort collection of object?

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Sort collection of object in rails?

I know I can use something like User.sort {|a, b| a.attribute <=> b.attribute} or User.find and order, but is it a way like comparable interface in Java, so every time I called sort on User object it will do sort on the predefined attributes. Thanks,

Answer:

You can do that by defining the <=> method for your objects. That way, you should be able to just...

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art at Stack Overflow Mark as irrelevant Undo

Other solutions

Is Collection<?> the same as Collection<? extends Object>?

Here is a phrasing that is easier on the eyes...   Which of the following is Collection<?> shorthand for: Collection Collection<? extends Object> Collection<? super Object> None of the above - it is an entirely unique concept...

Answer:

Collection is not type safe. Elements of any type can be added to the collection, and when removed they...

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Tim Wilson at Quora Mark as irrelevant Undo

Why does the Arrays.sort(Object[]) use insertion sort if the array length is less than 7?

Arrays.sort(Object[]) applies insertion sort if the array length < 7, else it applies merge sort. Why would it do so if merge sort has O(n log n) time complexity and insertion sort has O(n^2)?

Answer:

Because asymptotic analysis is part of the story, but you need to consider other factors as well: MergeSort...

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Yuval Feinstein at Quora Mark as irrelevant Undo

How do you sort your music collection?

I have a huge collection of music (~100GB) on my computer which I'm trying to sort using iTunes. Let's hear some of the best and innovative ways to sort out music.

Answer:

Once upon a time I had a 350 GB+ music collection & all of it was "...

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Quora User at Quora Mark as irrelevant Undo

How do we sort & value a construction toy collection?

How do we catalog & value a large die-cast construction toy collection for eventual sale? A family friend's husband collected die-cast models of construction equipment (mainly Caterpillar stuff). He passed away a few years ago and she'd now like...

Answer:

Spreadsheet is not worth it, there's lots of home inventory programs for desktop or mobile device. If...

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Monster_Zero at Ask.Metafilter.Com Mark as irrelevant Undo

What is the best way to sort my Basketball card collection?

I've got around 400 Vince Carter basketball cards (commons, inserts, and memorabilia), and I'm having a tough time on how to sort them. Do i sort them by year? Or by value? Or alphabetically? Kindly give your suggestions. Many thanks!!!

Answer:

I generally sort all of my sports cards by year, sport & brand first (Upper Deck, Topps, etc.) ...

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rainsmd at Yahoo! Answers Mark as irrelevant Undo

How do I sort an ArrayList of objects by each object's integer parameter?

Say I have an ArrayList of Employee objects. These objects' parameters are String, int, and enum. So each element in the array is an object that looks like this: Employee Samuel = new Employee("Samuel", 56, Department.ACCOUNTING); After I've...

Answer:

You can either implement Comparator and use that in java.util.Collections.sort to sort your list. public...

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Soheil Hassas Yeganeh at Quora Mark as irrelevant Undo

I would like a photo screensaver that can help me sort through my huge photo collection. 1-button delete. help?

I have a huge collection of photos. I'd like to put them all on a screen saver at work with the ability to delete (for instance, inappropriate) photos with a keystroke as the photos are being cycled through. It would help if the screensaver also had...

Answer:

Try Picasa from google. Do not know if it will delete, but it is a very good organizer

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Andymon * at Yahoo! Answers Mark as irrelevant Undo

Have you some sort of collection you have been adding to each year?

Where do you get more of this treasured collection you have been collecting over many years? What does it consist of? Thank you for your answers.

Answer:

I collect Star Trek Memorabilia, Such as These Plates http://www.buycheapr.com/us/result.jsp?g&hellip...

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Tara Scott at Yahoo! Answers Mark as irrelevant Undo

Did your parents ever hit you with some sort of object?

What was this object lol. I've gotten hit with a shoe, a belt, I was disciplined not abused lol.

Answer:

I had the paddle with the ball, and as soon as the ball broke off of it that is what my parents used...

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Z2GGOMYBOYC5VCCR5HLNTRSF54 at Yahoo! Answers Mark as irrelevant Undo

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