(This is a snapshot of my old weblog. New posts and selected republished essays can be found at raganwald.com.)
Sunday, September 16, 2007
Breaking News: Write a Ruby function. Win a $100 Bounty!
I just spotted this on the Toronto Ruby on Rails mailing list:
/me thinks it’s too quiet here. Time for a Sunday afternoon ruby
challenge!
$100 for the best implementation, good until 6pm tonight (September 16, 2007).
THE PROBLEM
Marcel’s Amazon S3 gem presents files stored in a bucket as an object
which exposes a key attribute that conceptually map to the idea of a
file in a filesystem. You can fake a folder hierarchy by uploading 0
byte files with a key ending in a / (eg. folder1/ )
The Ruby Way is the perfect second Ruby book for serious programmers. The Ruby Way contains more than four hundred examples explaining how to do everything from distribute Ruby with Rinda to dynamic programming techniques just like these.
Your mission is to convert the objects array of an S3 bucket to a
Hash, so that we can present a tree view to the user. It should
support an arbitrary depth, and make good use of Ruby best practices.
THE TEST DATA
Let’s assume you have a bunch of items in a bucket, and if you iterate
through the item keys, you’ll get this list:
This covers all cases; a hierarchy of files in folders, including
files in the root and empty folders.
THE SOLUTION
In other words, for each item in the hash, the name is the key without
any preceding path, and the value is the AWS::S3::S3Object that the
key points to. (I just pasted the same object in the example.)
And… go!
Pete Forde, unspace.ca
Do you want to win the $100? Pete told me that your solution is eligible to win provided you post it to the TorROR mailing list by 6PM, September 16th, 2007 (EST). For more details, see the TorROR Google Group.
I just spotted this on the Toronto Ruby on Rails mailing list:
/me thinks it’s too quiet here. Time for a Sunday afternoon ruby
challenge!
$100 for the best implementation, good until 6pm tonight (September 16, 2007).
THE PROBLEM
Marcel’s Amazon S3 gem presents files stored in a bucket as an object
which exposes a key attribute that conceptually map to the idea of a
file in a filesystem. You can fake a folder hierarchy by uploading 0
byte files with a key ending in a / (eg. folder1/ )
The Ruby Way
is the perfect second Ruby book for serious programmers. The Ruby Way contains more than four hundred examples explaining how to do everything from distribute Ruby with Rinda to dynamic programming techniques just like these.Hash, so that we can present a tree view to the user. It should
support an arbitrary depth, and make good use of Ruby best practices.
THE TEST DATA
Let’s assume you have a bunch of items in a bucket, and if you iterate
through the item keys, you’ll get this list:
folder1/
folder2/
folder2/folder4/
folder2/folder5/
folder2/folder5/temp6.txt
folder2/temp3.txt
folder2/temp4.txt
folder2/temp5.txt
folder3/
folder3/temp7.txt
temp1.txt
temp2.txt
This covers all cases; a hierarchy of files in folders, including
files in the root and empty folders.
THE SOLUTION
results = {
"temp1.txt" => #<AWS::S3::S3Object:0x31ab7bc>,
"temp2.txt" => #<AWS::S3::S3Object:0x31ab7bc>,
"folder1" => {},
"folder2" => {
"temp3.txt" => #<AWS::S3::S3Object:0x31ab7bc>,
"temp4.txt" => #<AWS::S3::S3Object:0x31ab7bc>,
"temp5.txt" => #<AWS::S3::S3Object:0x31ab7bc>,
"folder4" => {},
"folder5" => {
"temp6.txt" => #<AWS::S3::S3Object:0x31ab7bc>
},
},
"folder3" => {
"temp7.txt" => #<AWS::S3::S3Object:0x31ab7bc>
}
}
In other words, for each item in the hash, the name is the key without
any preceding path, and the value is the AWS::S3::S3Object that the
key points to. (I just pasted the same object in the example.)
And… go!
Pete Forde, unspace.ca
Do you want to win the $100? Pete told me that your solution is eligible to win provided you post it to the TorROR mailing list by 6PM, September 16th, 2007 (EST). For more details, see the TorROR Google Group.
Labels: ruby
