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Removing a model in rails (reverse of “rails g model Title…”)
...del_name>
When you generate a model, it creates a database migration. If you run 'destroy' on that model, it will delete the migration file, but not the database table. So before run
bundle exec rake db:rollback
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How do I specify “close existing connections” in sql script
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I've used this but often wondered if there was a window of opportunity for another user to get in as the "single user" - is that possible? Possible alternative is ALTER DATABASE [MyDatabaseName] SET OFFLINE WITH ROLLBACK IMMEDIATE
– Kri...
Is AngularJS just for single-page applications (SPAs)?
...e not.. that's like saying "Jquery is only for projects with animations".
If it fits your project, use it.
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JVM option -Xss - What does it do exactly?
... is used to hold return addresses, function/method call arguments, etc. So if a thread tends to process large structures via recursive algorithms, it may need a large stack for all those return addresses and such. With the Sun JVM, you can set that size via that parameter.
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How can I calculate the difference between two dates?
...ts will always be time-zone-agnostic.
Furthermore, this documentation specifies that Cocoa's implementation of time does not account for leap seconds, so if you require such accuracy, you will need to roll your own implementation.
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When to catch java.lang.Error?
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Generally, never.
However, sometimes you need to catch specific errors.
If you're writing framework-ish code (loading 3rd party classes), it might be wise to catch LinkageError (no class def found, unsatisfied link, incompatible class change).
I've also seen some stupid 3rd-party ...
What is the JSF resource library for and how should it be used?
...ike Mojarra and MyFaces and JSF component libraries like PrimeFaces and OmniFaces use it. No one of them use resource libraries this way. They use it (under the covers, by @ResourceDependency or UIViewRoot#addComponentResource()) the following way:
<h:outputScript library="javax.faces" name="jsf...
How do I test a file upload in rails?
...ls 3, Rails 5), which will search your fixtures directory for the file specified and will make it available as a test file for the controller in functional testing. To use it:
1) Put your file to be uploaded in the test in your fixtures/files subdirectory for testing.
2) In your unit test you can ...
How can I check whether a option already exist in select by JQuery
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This evaluates to true if it already exists:
$("#yourSelect option[value='yourValue']").length > 0;
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What is the “realm” in basic authentication
... assigned by the origin server, which may have additional semantics
specific to the authentication scheme.
In short, pages in the same realm should share credentials. If your credentials work for a page with the realm "My Realm", it should be assumed that the same username and password combina...