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How to define two fields “unique” as couple
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There is a simple solution for you called unique_together which does exactly what you want.
For example:
class MyModel(models.Model):
field1 = models.CharField(max_length=50)
field2 = models.CharField(max_length=50)
class Meta:
unique_together = ('field1', 'fi...
Postgres - FATAL: database files are incompatible with server
... btw, immediately after this you'll probably need to run createuser -s your_rails_app to create the rails' postgres user. See stackoverflow.com/questions/11919391/…
– Meekohi
Dec 20 '17 at 18:39
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What is “rvalue reference for *this”?
.... Take the following code as a further example:
struct test2{
std::unique_ptr<int[]> heavy_resource;
test2()
: heavy_resource(new int[500]) {}
operator std::unique_ptr<int[]>() const&{
// lvalue object, deep copy
std::unique_ptr<int[]> p(new int[500]);
f...
Crash logs generated by iPhone Simulator?
...gured out is how to get them to generate even if the debugger grabs the EXC_BAD_ACCESS signal.
Update
Currently, (OSX 10.11.6), the .crash logs in ~/Library/Logs/DiagnosticReports, are when the emulator itself crashes. Logs for an app crashing (but the emulator device is still running fine), ar...
Shell command to sum integers, one per line?
... for a: count all documents’ pages script: ls $@ | xargs -i pdftk {} dump_data | grep NumberOfPages | awk '{s+=$2} END {print s}'
– flying sheep
Jul 10 '13 at 14:42
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How to modify Github pull request？
...nswered Apr 29 '14 at 18:08
user_19user_19
55177 silver badges1212 bronze badges
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Distinct not working with LINQ to Objects
...answered Aug 25 '16 at 8:19
Ashu_90Ashu_90
68666 silver badges88 bronze badges
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How to Convert all strings in List to lower case using LINQ?
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var _reps = new List(); // with variant data
_reps.ConvertAll<string>(new Converter<string,string>(delegate(string str){str = str.ToLower(); return str;})).Contains("invisible"))
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Installing SciPy and NumPy using pip
... To install BLAS and LAPACK you need to run yum install lapack-devel.x86_64 blas-devel.x86_64
– Max L
Apr 5 '16 at 11:27
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invalid target release: 1.7
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You need to set JAVA_HOME to your jdk7 home directory, for example on Microsoft Windows:
"C:\Program Files\Java\jdk1.7.0_40"
or on OS X:
/Library/Java/JavaVirtualMachines/jdk1.7.0_40.jdk/Contents/Home
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