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How to check if a specified key exists in a given S3 bucket using Java
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answered Nov 29 '11 at 1:28
sethusethu
7,08944 gold badges3333 silver badges5959 bronze badges
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How to wrap async function calls into a sync function in Node.js or Javascript?
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edited Feb 24 '15 at 4:31
answered Mar 11 '14 at 19:08
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C++, variable declaration in 'if' expression
...t you were trying to do is finally possible:
if (int a = Func1(), b = Func2(); a && b)
{
// Do stuff with a and b.
}
Note the use of ; of instead of , to separate the declaration and the actual condition.
shar...
How to disable textarea resizing?
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322
You can use css
disable all
textarea { resize: none; }
only vertical resize
textarea { r...
How does Rails keep track of which migrations have run for a database?
...g row from schema_migrations.
For example, running a migration file named 20120620193144_create_users.rb will insert a new row with a version of 20120620193144 into the schema_migrations table.
You are free at any point to introduce migrations with earlier versions. Rails will always run any new m...
Get environment variable value in Dockerfile
... request_domain
or if you'd prefer a default value:
ARG request_domain=127.0.0.1
Now you can reference this variable inside your Dockerfile:
ENV request_domain=$request_domain
then you will build your container like so:
$ docker build --build-arg request_domain=mydomain Dockerfile
Note 1...
Heroku/devise - Missing host to link to! Please provide :host parameter or set default_url_options[:
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244
You need to add this to your environment.rb
config.action_mailer.default_url_options = { :h...
How can I put a database under git (version control)?
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25 Answers
25
Active
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pdftk compression option
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122
I had the same problem and found two different solutions (see this thread for more details). Bo...
What does JVM flag CMSClassUnloadingEnabled actually do?
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219
Update This answer is relevant for Java 5-7, Java 8 has this fixed: https://blogs.oracle.com/p...