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How to set default values in Rails?
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Beware this does NOT work on Rails 4.2.x (not tested on later versions). as change_column can be quite "structuring", the reverse operation cannot be deduced. If you're not sure, just test it by running db:migrate and db:rollback right after. Accepted answer as the same ...
Can we define implicit conversions of enums in c#?
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This solution might be 'right' as an exercise, or testing someone's programming skills but, please, don't do this in real life. Not only it's overkill, it's unproductive, unmaintainable and ugly as hell. You don't need to use an enum just for the sake of it. You either put a...
How to use NSURLConnection to connect with SSL for an untrusted cert?
...d to accept an un-trusted certificate.
Scenario A: You are connected to a test environment which is using a self-signed certificate.
Scenario B: You are Proxying HTTPS traffic using a MITM Proxy like Burp Suite, Fiddler, OWASP ZAP, etc. The Proxies will return a certificate signed by a self-signed...
Simulate low network connectivity for Android [closed]
I would like to test my application for cases of low network connectivity. Except standing in the elevator, what is the best way to do this? I've tried wrapping my phone in an aluminum foil, but it didn't help much.
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Pandas convert dataframe to array of tuples
...e any reason that we'd think that the accepted answer is faster? The quick test I did indicates that the itertuples version is faster.
– T.C. Proctor
Mar 1 '19 at 19:27
2
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How to select rows from a DataFrame based on column values?
...pd.Series
mask = df['A'].values == 'foo'
I'll show more complete time tests at the end, but just take a look at the performance gains we get using the sample data frame. First, we look at the difference in creating the mask
%timeit mask = df['A'].values == 'foo'
%timeit mask = df['A'] == 'foo...
c# datatable to csv
...rray();
sb.AppendLine(string.Join(",", fields));
}
File.WriteAllText("test.csv", sb.ToString());
.net >= 4.0
And as Tim pointed out, if you are on .net>=4, you can make it even shorter:
StringBuilder sb = new StringBuilder();
IEnumerable<string> columnNames = dt.Columns.Cast&l...
When should TaskCompletionSource be used?
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It looks like no one mentioned, but I guess unit tests too can be considered real life enough.
I find TaskCompletionSource to be useful when mocking a dependency with an async method.
In actual program under test:
public interface IEntityFacade
{
Task<Entity> Ge...
How do I create a readable diff of two spreadsheets using git diff?
...eric or openoffice.org, and are mostly used to populate databases for unit testing with dbUnit . There are no easy ways of doing diffs on xls files that I know of, and this makes merging extremely tedious and error prone.
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How to change an Android app's name?
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@lxknvlk, from my testing on Android 5 and 5.1, the name referred to in this answer is displayed in the list of installed applications, the uninstall dialog, and the "App Info" screen for your app. If you want to customise the name shown in t...