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How do you delete an ActiveRecord object?
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It's destroy and destroy_all methods, like
user.destroy
User.find(15).destroy
User.destroy(15)
User.where(age: 20).destroy_all
User.destroy_all(age: 20)
Alternatively you can use delete and delete_all which won't enforce :before_destroy and :after_destroy callbacks or any dependent associ...
Change UICollectionViewCell size on different device orientations
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1) You could maintain and swap out multiple layout objects, but there's a simpler way. Just add the following to your UICollectionViewController subclass and adjust the sizes as required:
- (CGSize)collectionView:(UICollecti...
Check whether a string contains a substring
...ns substring you can use the index function:
if (index($str, $substr) != -1) {
print "$str contains $substr\n";
}
It will return the position of the first occurrence of $substr in $str, or -1 if the substring is not found.
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How do I search within an array of hashes by hash values in ruby?
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Dave Powers
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answered Feb 11 '10 at 14:11
Jordan RunningJo...
How to send POST request?
...s
>>> r = requests.post("http://bugs.python.org", data={'number': 12524, 'type': 'issue', 'action': 'show'})
>>> print(r.status_code, r.reason)
200 OK
>>> print(r.text[:300] + '...')
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/x...
Does MySQL included with MAMP not include a config file?
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189
The MySQL server of MAMP (not PRO) will be started without any my.cnf file. But you can create...
Should you always favor xrange() over range()?
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Python Charts库(Highcharts API的封装) - 大数据 & AI - 清泛网 - 专注C/C++及内核技术
...进行封装,通过python生成Highcharts脚本Highcharts中文网:http: v1 hcharts cn demo index php?p=1 charts库实际是对调用Highcharts API 进行封装,通过python生成Highcharts脚本
Highcharts中文网:http://v1.hcharts.cn/demo/index.php?p=10
Highcharts官网:http://api.highchar...