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Preventing Laravel adding multiple records to a pivot table
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You can also use the $model->sync(array $ids, $detaching = true) method and disable detaching (the second param).
$cart->items()->sync([$item->id], false);
Update:
Since Laravel 5.3 or 5.2.44, you can also call syncWithoutDetaching:
$cart->ite...
How to sort by two fields in Java?
I have array of objects person (int age; String name;) .
16 Answers
16
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What are the differences between vector and list data types in R?
...er they are recursive, atomic or have dimensional attributes (matrices and arrays). However, I'm not sure that a discussion of the "advantages and disadvantages" of different data structures is a sufficiently focused question for SO. To add to what Tommy said, besides lists being capable of holding ...
MySQL, Check if a column exists in a table with SQL
...mysql_query("SELECT * FROM `my_table_name` LIMIT 1");
$mycol = mysql_fetch_array($chkcol);
if(!isset($mycol['my_new_column']))
mysql_query("ALTER TABLE `my_table_name` ADD `my_new_column` BOOL NOT NULL DEFAULT '0'");
shar...
What is 'YTowOnt9'?
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It seems to be a PHP-serialized empty array, base 64 encoded.
$ base64 -D <<< 'YTowOnt9'
a:0:{}
$ php -r 'var_dump(unserialize(base64_decode("YTowOnt9")));'
array(0) {
}
There are many scripts that serialize arrays of data. When the arrays have data, ...
How do you clear a slice in Go?
...resting. Is there any other way to remove all elements from the underlying array of the slice while leaving the underlying capacity unchanged?
– Chris Weber
Jun 6 '13 at 21:07
3
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90后创业四年:曾经觉得不公 后来愿赌服输 - 资讯 - 清泛网 - 专注C/C++及内核技术
...流量，我觉得很不公平。
后来我反思总结了一下，这种使用场景，不应该站在技术人员的角度来看，而是应该站在产品经理的角度来看。这类产品对用户来讲只是娱乐的需求，用户其实不太关心准不准确，只是哈哈一笑。我用...
How can I shift-select multiple checkboxes like GMail?
...ired by the fine answers provided, here's a plain JavaScript version using Array.prototype to coerce nodelists to use array functions, rather than for loops.
(function () { // encapsulating variables with IIFE
var lastcheck = null // no checkboxes clicked yet
// get desired checkboxes
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How to swap keys and values in a hash
...ue you can use Hash#invert. If not, then you can keep all the values as an array, like this:
class Hash
# like invert but not lossy
# {"one"=>1,"two"=>2, "1"=>1, "2"=>2}.inverse => {1=>["one", "1"], 2=>["two", "2"]}
def safe_invert
each_with_object({}) do |(key,value...
Is if(items != null) superfluous before foreach(T item in items)?
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Cute idea; an empty array would be preferable because it consumes less memory and produces less memory pressure. Enumerable.Empty<string> would be even more preferable because it caches the empty array it generates and re-uses it.
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