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How to copy files between two nodes using ansible
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good answer! Unfortunately I did not get it working in an Vagrant environment with multi VMs. Seems Vagrant does something special there.
– therealmarv
Mar 5 '15 at 6:56
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How do I make an HTML text box show a hint when empty?
...hould display the text normally (black, non-italics). This will help me avoid clutter by removing the label.
21 Answers
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Declaring a default constraint when creating a table
... square brackets rather than quotes as many readers won't work with QUOTED_IDENTIFIERS on by default.
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Converting from Integer, to BigInteger
...eger the intValue() will not overflow, so the call to valueOf will simply widen the int to a long. There's no noticeable difference between using longValue() and intValue() in this example, but if he started with a Long, he would want to use longValue().
– jbindel
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Open another application from your own (intent)
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Firstly, the concept of "application" in Android is slightly an extended one.
An application - technically a process - can have multiple activities, services, content providers and/or broadcast listeners. If at least one of them is running, the application is up and run...
Pycharm does not show plot
... It's really amazing - this worked for me, and none of the others did. What was surprising is, I didn't need plt.show() in Jupyter Notebook, dunno why the behavior is different in PyCharm
– Ambareesh
Jan 24 '19 at 5:08
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No route matches “/users/sign_out” devise rails 3
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I did the test and it works for me. Don't forget that things change from one version to another (be it in Rails or Devise). Besides, logging out is state-changing behaviour which should not be done using GET methods (in my humb...
difference between primary key and unique key
...S it cannot be NULL - e.g. MySQL adds NOT NULL
Primary Key is a unique key identifier of the record
Unique Key:
Can be more than one unique key in one table
Unique key can have NULL values
It can be a candidate key
Unique key can be NULL ; multiple rows can have NULL values and therefore may not...
Objective-C: Calling selectors with multiple arguments
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Your method signature is:
- (void) myTest:(NSString *)
withAString happens to be the parameter (the name is misleading, it looks like it is part of the selector's signature).
If you call the function in this manner:
[self performSelector:@selector(myTe...
Run JavaScript when an element loses focus
...want to run JavaScript code when it loses focus. Sadly my Google searches did not reveal how to do this.
5 Answers
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