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Removing a model in rails (reverse of “rails g model Title…”)
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bundle exec rake db:rollback
rails destroy model <model_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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A Java collection of value pairs? (tuples?)
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The Pair class is one of those "gimme" generics examples that is easy enough to write on your own. For example, off the top of my head:
public class Pair<L,R> {
private final L left;
private final R right;
public Pair(L left, R right) {
asse...
How do I get the directory that a program is running from?
Is there a platform-agnostic and filesystem-agnostic method to obtain the full path of the directory from where a program is running using C/C++? Not to be confused with the current working directory. (Please don't suggest libraries unless they're standard ones like clib or STL.)
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Simulate first call fails, second call succeeds
...mplified) code below. I don't know how to tell Mockito to fail the first time, then succeed the second time.
5 Answers
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How to open a web server port on EC2 instance
... click "Save" it is not opening my port 3000, is there an "Apply" button somewhere?
– Noitidart
Aug 30 '18 at 20:00
1
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Using helpers in model: how do I include helper dependencies?
... With this I get stack level too deep. It is in a before_save method.
– Automatico
Aug 1 '13 at 0:35
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How can I create a “Please Wait, Loading…” animation using jQuery?
...a small status on the page saying "Loading...", or as loud as an entire element graying out the page while the new data is loading. The approach I'm taking below will show you how to accomplish both methods.
The Setup
Let's start by getting us a nice "loading" animation from http://ajaxload.info
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Why would $_FILES be empty when uploading files to PHP?
...ed in manually.
Make sure you do not have two input file fields with the same name attribute. If you need to support multiple, put square brackets at the end of the name:
<input type="file" name="files[]">
<input type="file" name="files[]">
Make sure your tmp and upload directories ha...
How to convert wstring into string?
...s the std::setlocale(LC_ALL, ""); really needed ?
– smerlin
Jan 26 '11 at 14:44
2
using std::wcou...
Best practice to return errors in ASP.NET Web API
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For me I usually send back an HttpResponseException and set the status code accordingly depending on the exception thrown and if the exception is fatal or not will determine whether I send back the HttpResponseException immediate...