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running Rails console in production
...an of course be substituted with development or test (value is development by default)
Adding the option --sandbox makes it so that any changes you make to your database in the console will be rolled back after you exit
If this isn't working for you, you may need to try
bundle exec rails console ...
Canary release strategy vs. Blue/Green
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both methods are meant to reduce risk by evaluating the new version. during means the the new version is deployed but a decision hasn't yet made regarding how to proceed. after means after a positive decision was made to proceed.
– itaysk
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Python: Append item to list N times
...o'] * 100
# ['foo', 'foo', 'foo', 'foo', ...]
For values that are stored by reference and you may wish to modify later (like sub-lists, or dicts):
l = [{} for x in range(100)]
(The reason why the first method is only a good idea for constant values, like ints or strings, is because only a shall...
Java: PrintStream to String?
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Use a ByteArrayOutputStream as a buffer:
import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import java.nio.charset.StandardCharsets;
final ByteArrayOutputStream baos = new ByteArrayOutputStream();
final St...
I lose my data when the container exits
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you can also start and attach a container by it's name. (e.g. docker run -it --name my_debian debian and after docker start my_debian && docker attach my_debian)
– Johnny Willer
Jun 18 '17 at 1:43
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Real escape string and PDO [duplicate]
...h different parameter values optimizes the performance of your application by allowing the driver to negotiate client and/or server side caching of the query plan and meta information, and helps to prevent SQL injection attacks by eliminating the need to manually quote the parameters.
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Polymorphism: Why use “List list = new ArrayList” instead of “ArrayList list = new ArrayList”? [dupl
...ll work because you have written your code to follow the contract provided by the List interface.
On the other hand, if you had implemented the core of your library using LinkedList list = new LinkedList(), making such a change wouldn't be as easy, as there is no guarantee that the rest of your co...
Cordova: start specific iOS emulator image
...fined" when specifying the target with quotes, I could only get it to work by running it like this cordova run ios --target=iPhone-6. Hope this saves someone else some trouble!
– Gifford N.
May 5 '17 at 14:46
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How to create custom exceptions in Java? [closed]
...used to denote errors internal to the JVM that cannot usually be "handled" by the programmer (e.g. OutOfMemoryError). Likewise you should avoid catching Throwable, which could result in you catching Errors in addition to Exceptions.
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C# generic “where constraint” with “any generic type” definition?
...in option2. The best solution would be if IGarage<TCar> found type T by analysing type TCar.
– pt12lol
May 16 '15 at 7:32
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