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Preventing Laravel adding multiple records to a pivot table
...resence of an existing record by writing a very simple condition like this one :
if (! $cart->items->contains($newItem->id)) {
$cart->items()->save($newItem);
}
Or/and you can add unicity condition in your database, it would throw an exception during an attempt of saving a doub...
Questions every good Java/Java EE Developer should be able to answer? [closed]
...tween Set, Map and List?
I'm still amazed how many people don't know this one in a telephone interview.
share
answered Jan 22 '10 at 1:09
...
How to detect a loop in a linked list?
...to have two references to the list and move them at different speeds. Move one forward by 1 node and the other by 2 nodes.
If the linked list has a loop they
will definitely meet.
Else either of
the two references(or their next)
will become null.
Java function implementing the algorithm:
boole...
WebSockets vs. Server-Sent events/EventSource
...g technologies. What is the difference between them? When would you choose one over the other?
6 Answers
...
How does Python's super() work with multiple inheritance?
...lls in the parents, nothing will happen. @lifeless's answer is the correct one.
– Cerin
Oct 17 '15 at 1:01
...
What is the effect of extern “C” in C++?
...s are distinct types even if otherwise identical
Linkage specs nest, inner one determines the final linkage
extern "C" is ignored for class members
At most one function with a particular name can have "C" linkage (regardless of namespace)
extern "C" forces a function to have external linkage (cannot...
Forking vs. Branching in GitHub
... collaborator for that specific project.
Forking is nothing more than a clone on the GitHub server side:
without the possibility to directly push back
with fork queue feature added to manage the merge request
You keep a fork in sync with the original project by:
adding the original project as...
Reading binary file and looping over each byte
...
To read a file — one byte at a time (ignoring the buffering) — you could use the two-argument iter(callable, sentinel) built-in function:
with open(filename, 'rb') as file:
for byte in iter(lambda: file.read(1), b''):
# Do stu...
Logging best practices [closed]
...etc) and Verbose logging simply becomes too much.
Rather than having only one switch that turns it all either on or off, it is useful to be able to turn on this information for one section of your system at a time.
This way, you can locate significant problems from the usually logging (all warning...
When to favor ng-if vs. ng-show/ng-hide?
... those elements will be lost. For example, if you bound a click handler to one of child elements, when ng-if evaluates to false, that element will be removed from DOM and your click handler will not work any more, even after ng-if later evaluates to true and displays the element. You will need to re...