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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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How can I change property names when serializing with Json.net?
...artin Brown
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answered Jan 9 '12 at 23:26
Darin DimitrovDarin Dimitrov
9...
MySQL ON vs USING?
...lid to just say film_id since that would make for an ambiguity:
ERROR 1052 (23000): Column 'film_id' in field list is ambiguous
As for select *, the joining column appears in the result set twice with ON while it appears only once with USING:
mysql> create table t(i int);insert t select 1...
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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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...
Numpy: find first index of value fast
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There is a feature request for this scheduled for Numpy 2.0.0: https://github.com/numpy/numpy/issues/2269
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How do I move an existing window to a new tab?
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answered Nov 19 '09 at 8:25
DrAlDrAl
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How to map calculated properties with JPA and Hibernate
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edited Jun 20 '18 at 16:43
Ask613
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How do I convert a org.w3c.dom.Document object to a String?
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edited Mar 26 '14 at 6:03
Ashish Aggarwal
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