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How get integer value from a enum in Rails?
...lass to access the integer value for that instance:
my_model = Model.find(123)
Model.sale_infos[my_model.sale_info] # Returns the integer value
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What does [object Object] mean?
...answered Aug 21 '14 at 6:25
user123444555621user123444555621
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Batch file: Find if substring is in string (not in a file)
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When this is run in CMD.EXE, we get:
C:\DemoDev>y pqrs "abc def pqr 123"
got one - pattern not found
C:\DemoDev>y pqr "abc def pqr 123"
got zero - found pattern
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Test if characters are in a string
...# Correct
> grepl("1+2", "1+2", fixed=TRUE)
[1] TRUE
> grepl("1+2", "123+456", fixed=TRUE)
[1] FALSE
# Incorrect
> grepl("1+2", "1+2")
[1] FALSE
> grepl("1+2", "123+456")
[1] TRUE
Interpretation
grep is named after the linux executable, which is itself an acronym of "Global Regular...
MQTT与TCP的区别 - 创客硬件开发 - 清泛IT社区，为创新赋能！
...地球战略的组成部分。
侵删，来源：https://blog.sciencenet.cn/blog-858128-1286181.html
Regex Email validation
...ht, fail to catch at least two invalid formats: "Abc.@example.com" , "Abc..123@example.com"
– sean717
Aug 22 '12 at 5:22
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Calculating a directory's size using Python?
...p)
return total_size
print(get_size(), 'bytes')
And a oneliner for fun using os.listdir (Does not include sub-directories):
import os
sum(os.path.getsize(f) for f in os.listdir('.') if os.path.isfile(f))
Reference:
os.path.getsize - Gives the size in bytes
os.walk
os.path.islink
Updat...
Redirect stderr and stdout in Bash
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On AIX (ksh) your solution works. The accepted answer do_something &>filename doesn't. +1.
– Withheld
Jan 4 '13 at 16:01
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Can a relative sitemap url be used in a robots.txt?
...nswered Aug 23 '19 at 6:30
cstpl123cstpl123
1722 bronze badges
add a c...
fstream默认不支持中文路径和输出整数带逗号的解决办法 - C/C++ - 清泛网 -...
...tfile )
{
cout << "Failed to create file!";
return ;
}
int i = 123456789;
outfile << "i = " << i << "/n"; //输出带逗号
outfile.close();
setlocale( LC_ALL, "C" ); //恢复全局locale，如果不恢复，可能导致cout无法输出中文
}
创建文件成功...