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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:
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How to rollback just one step using rake db:migrate
After adding migration files in the db/migrate folder and running rake db:migrate , I want get back to the previous step, I think using VERSION=n is the right way to do that, but I don't know the correct value of n to use. Is there any command to check the current n value?
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XML schema or DTD for logback.xml?
...een several discussions on the net about how great it would be to have an XML schema or DTD for logback.xml file to have at least the very basic validation and auto-completion in IDEs like IDEA or Eclipse, but I never saw any solution.
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How can I calculate the time between 2 Dates in typescript
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Use the getTime method to get the time in total milliseconds since 1970-01-01, and subtract those:
var time = new Date().getTime() - new Date("2013-02-20T12:01:04.753Z").getTime();
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How to determine function name from inside a function
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You can use ${FUNCNAME[0]} in bash to get the function name.
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Rails: convert UTC DateTime to another time zone
In Ruby/Rails, how do I convert a UTC DateTime to another time zone?
6 Answers
6
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LD_LIBRARY_PATH vs LIBRARY_PATH
I'm building a simple C++ program and I want to temporarily substitute a system supplied shared library with a more recent version of it, for development and testing.
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Heroku free account limited?
Currently, I am running wordpress as my blog engine on free hosting, but I'm planning to move to use git-based blog engine(Jekyll, Toto) on Ruby platform. Then I see Heroku provides free account features, but I don't see any detail on bandwidth, disk spaces, requests?
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Forcing child to obey parent's curved borders in CSS
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According to the specs:
A box's backgrounds, but not its
border-image, are clipped to the
appropriate curve (as determined by
‘background-clip’). Other effects that
clip to the border or padding edge
(such as ‘overflow’ other than
‘visible’) also must clip to the
cu...
How do I convert a org.w3c.dom.Document object to a String?
I want to convert a org.w3c.dom.Document object to a String. I'm using Java 6 and am open to using any (completely free) technology that is up to the task. I tried the solution from this thread -- Is there a more elegant way to convert an XML Document to a String in Java than this code? , where t...