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Why is SELECT * considered harmful?
...er. Imagine a query that joins two tables, both of which contain a column called "ID". How would a consumer know which was which? SELECT * can also confuse views (at least in some versions SQL Server) when underlying table structures change -- the view is not rebuilt, and the data which comes bac...
Why is using the rails default_scope often recommend against?
... default_scope { where(published: true) }
belongs_to :user
end
Calling user.destroy will delete all the posts that are published, but it won't delete posts that are unpublished. Hence the database will throw a foreign key violation because it contains records that reference the user you ...
Inheriting constructors
...y selected ones you need to write the individual constructors manually and call the base constructor as needed from them.
Historically constructors could not be inherited in the C++03 standard. You needed to inherit them manually one by one by calling base implementation on your own.
...
Start ssh-agent on login
... even if you don't use ssh. Need to make this fire off every time ssh is called... and ideally, you should be able to configure which hosts cause which keys to load.
– Erik Aronesty
Jul 22 '16 at 15:30
...
Remove border radius from Select tag in bootstrap 3
...
the class is called:
.form-control { border-radius: 0; }
be sure to insert the override after including bootstraps css.
If you ONLY want to remove the radius on select form-controls use
select.form-control { ... }
instead
EDIT: w...
ruby send method passing multiple parameters
Trying to create objects and call methods dynamically by
2 Answers
2
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Apply CSS style attribute dynamically in Angular JS
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ngStyle directive allows you to set CSS style on an HTML element dynamically.
Expression which evals to an object whose keys are CSS style names and values are corresponding values for those CSS keys. Since some CSS style names are not valid keys for an object, they must be quoted.
ng-sty...
Akka Kill vs. Stop vs. Poison Pill?
...is synchronous vs. Poison pill is asynchronous." But in what way? Does the calling actor thread lock during this time? Are the children actors notified during kill, post-stop envoked, etc? Example uses of one concept vs. the other?
...
Why doesn't Java allow generic subclasses of Throwable?
...ype-correctness. The generic type information is then removed in a process called type erasure. For example, List<Integer> will be converted to the non-generic type List.
Because of type erasure, type parameters cannot be determined at run-time.
Let's assume you are allowed to extend Throwab...
Configuring Git over SSH to login once
...ewhere.
All ssh-family commands1 will then consult the agent and automatically be able to use your private key.
On OSX (err, macOS), GNOME and KDE systems, ssh-agent is usually launched automatically for you. I will go through the details in case, like me, you also have a Cygwin or other windows ...