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When would you use a WeakHashMap or a WeakReference?
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edited May 17 '17 at 12:20
answered Sep 30 '08 at 20:09
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What should a Multipart HTTP request with multiple files look like? [duplicate]
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2 Answers
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Retrieve a single file from a repository
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21 Answers
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What is the difference between $(command) and `command` in shell programming?
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280
The backticks/gravemarks have been deprecated in favor of $() for command substitution because...
How to use ssh agent forwarding with “vagrant ssh”?
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I'm using vagrant 2 on OS X Mountain Lion.
Vagrant.configure("2") do |config|
config.ssh.private_key_path = "~/.ssh/id_rsa"
config.ssh.forward_agent = true
end
config.ssh.private_key_path is your local private key
Your private key must...
What is the default scope of a method in Java?
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265
The default scope is package-private. All classes in the same package can access the method/fi...
sqlalchemy IS NOT NULL select
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How to overload functions in javascript?
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127
There are multiple aspects to argument overloading in Javascript:
Variable arguments - You ca...
How do I determine whether an array contains a particular value in Java?
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Rails find_or_create_by more than one attribute?
...er.where(:member_id => 4, :group_id => 7).first_or_initialize
Edit 2: Not all of these were factored out of rails just the attribute specific ones.
https://github.com/rails/rails/blob/4-2-stable/guides/source/active_record_querying.md
Example
GroupMember.find_or_create_by_member_id_and_...