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How to add multiple objects to ManyToMany relationship at once in Django ?
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Use: object.m2mfield.add(*items) as described in the documentation:
add() accepts an arbitrary number of arguments, not a list of them.
add(obj1, obj2, obj3, ...)
To expand that list into arguments, use *
add(*[obj1, obj2, obj3])
A...
differences between 2 JUnit Assert classes
The JUnit framework contains 2 Assert classes (in different packages, obviously) and the methods on each appear to be very similar. Can anybody explain why this is?
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What is the apply function in Scala?
... compose method on f and chaining two different functions together:
val f2 = f.compose((x:Int) => x - 1)
Now if we want to actually execute the function, or as mathematician say "apply a function to its arguments" we would call the apply method on the Function1[Int,Int] object:
f2.apply(2)
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Gradle alternate to mvn install
I have 2 different project build on mvn. I am trying to replace to Gradle.
4 Answers
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Float vs Decimal in ActiveRecord
...Float. It's like a scientific notation for binary (something like +1.43*10^2). Because of that, it is impossible to store fractions and decimals in Float exactly.
That's why there is a Decimal format. If you do this:
irb:001:0> "%.47f" % (1.0/10)
=> "0.10000000000000000555111512312578270211...
SQL Group By with an Order By
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200
In all versions of MySQL, simply alias the aggregate in the SELECT list, and order by the alia...
How to get year/month/day from a date object?
alert(dateObj) gives Wed Dec 30 2009 00:00:00 GMT+0800
16 Answers
16
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Adding data attribute to DOM
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432
Use the .data() method:
$('div').data('info', '222');
Note that this doesn't create an actual...