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How to define two fields “unique” as couple
...ple:
class MyModel(models.Model):
field1 = models.CharField(max_length=50)
field2 = models.CharField(max_length=50)
class Meta:
unique_together = ('field1', 'field2',)
And in your case:
class Volume(models.Model):
id = models.AutoField(primary_key=True)
journal_id = models.Foreign...
How to rollback just one step using rake db:migrate
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answered Dec 4 '10 at 9:43
rwilliamsrwilliams
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Should I use static_cast or reinterpret_cast when casting a void* to whatever
... mapping performed by reinterpret_cast is implementation-defined.” [5.2.10.3]
But in the particular case of casting from void* to T* the mapping is completely well-defined by the standard; namely, to assign a type to a typeless pointer without changing its address.
This is a reason to prefer sta...
How to avoid merge-commit hell on GitHub/BitBucket
...k!
– Todd A. Jacobs
May 3 '13 at 22:02
3
One thing to note with this process is that, before merg...
Do you need to close meta and link tags in HTML?
...t it causes no harm (except if you try to validate e.g. against the HTML 4.01 doctype).
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How to create multiple levels of indentation in Javadoc?
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Charlie MartinCharlie Martin
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I don't understand -Wl,-rpath -Wl,
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answered Jul 3 '11 at 10:47
Kerrek SBKerrek SB
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Xcode 6 / Beta 4: using bridging headers with framework targets is unsupported
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edited May 23 '17 at 10:31
Community♦
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answered Jul 22 '14 at 4:22
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makefile execute another target
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edited Jun 20 at 9:12
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answered Jul 16 '10 at 16:53
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string.ToLower() and string.ToLowerInvariant()
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answered Nov 4 '13 at 22:05
AaronLSAaronLS
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