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Rails create or update magic?
... if it doesn't exist.
def self.find_by_or_create_with(args, attributes) # READ CAREFULLY! args for finding, attributes for creating!
obj = self.find_or_initialize_by(args)
return obj if obj.persisted?
return obj if obj.update_attributes(attributes)
end
...
Rails migrations: self.up and self.down versus change
...ossible, so you need to define the down method.
As said, I suggest you to read the Rails Migrations Guide.
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How can I remove a specific item from an array?
... 4, 5, 3]
arr = arr.filter(item => !forDeletion.includes(item))
// !!! Read below about array.includes(...) support !!!
console.log(arr)
// [ 1, 4 ]
IMPORTANT "array.includes(...)" function is not supported in Internet Explorer at all, Chrome before 47 version, Firefox before 43 version, Saf...
How using try catch for exception handling is best practice
...y is :
To catch all unhandled exceptions by hooking to the Application.ThreadException event, then decide :
For a UI application: to pop it to the user with an apology message (winforms)
For a Service or a Console application: log it to a file (service or console)
Then I always enclose every ...
Python int to binary string?
...tr.zfill() call: bin(i)[2:].zfill(16) (no need to call str()!). format()'s readability and flexibility (dynamic formatting is much harder with bin()) are great tradeoffs, don't optimise for performance unless you have to, until then optimise for maintainability.
– Martijn Piete...
How to execute maven plugin execution directly from command line?
...e currently not supported. However, according to the comments of MNG-3401 (read them until the end):
for mojos invoked directly from the
command line, you can supply
configuration from the POM using the
executionId: 'default-cli' like this:
<plugin>
<artifactId>maven-assembl...
How do I import global modules in Node? I get “Error: Cannot find module ”?
... use npm link <global-package> to create a local link to a package already installed globally. (Caveat: The OS must support symlinks.)
However, this doesn't come without its problems.
npm link is a development tool. It's awesome for managing packages on your local development box. But d...
what is the difference between XSD and WSDL
...an provide the data appropriately.
Refer : ayazroomy-java.blogspot.com to read about basics of webservice.
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Which .NET Dependency Injection frameworks are worth looking into? [closed]
...rameworks available at https://github.com/quozd/awesome-dotnet/blob/master/README.md#ioc:
Castle Windsor - Castle Windsor is best of breed, mature Inversion of Control container available for .NET and Silverlight
Unity - Lightweight extensible dependency injection container with support for constr...
How to Turn Off Showing Whitespace Characters in Visual Studio IDE
...chWheat Seems to me that most developer disagree with you. I suggest you read their comments. It might change your minds about using tabs programmers.stackexchange.com/questions/57/…
– JSON
Aug 3 '16 at 13:25
...