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What is causing this ActiveRecord::ReadOnlyRecord error?
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Rails 2.3.3 and lower
From the ActiveRecord CHANGELOG(v1.12.0, October 16th, 2005):
Introduce read-only records. If you call object.readonly! then it will
mark the object as read-only and raise
ReadOnlyRecord if you call
object.save. object.readonly? reports
whether the ...
How to re-raise an exception in nested try/except blocks?
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edited Jul 20 at 13:45
answered Aug 12 '13 at 13:47
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How do I get the RootViewController from a pushed controller?
...andard way of getting the "back" view controller. The reason objectAtIndex:0 works is because the view controller you're trying to access is also the root one, if you were deeper in the navigation, the back view would not be the same as the root view.
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How to convert a string of bytes into an int?
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110
You can also use the struct module to do this:
>>> struct.unpack("<L", "y\xcc\xa6\x...
Java: Class.this
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edited Jul 25 at 14:40
Rarblack
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answered Ap...
Why use make over a shell script?
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answered Sep 26 '10 at 16:05
Jerry CoffinJerry Coffin
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Access mysql remote database from command line
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303
To directly login to a remote mysql console, use the below command:
mysql -u {username} -p'{pa...
How to prove that a problem is NP complete?
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edited Jun 20 at 9:12
Community♦
111 silver badge
answered Nov 27 '10 at 23:11
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Array Size (Length) in C#
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b.GetLength(dimensionIndex)
will get the length of any given dimension (0-based indexing for the dimensions - so b.GetLength(0) is 3 and b.GetLength(1) is 5).
See System.Array documentation for more info.
As @Lucero points out in the comments, there is a concept of a "jagged array", which is re...
What's the difference between == and .equals in Scala?
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204
You normally use ==, it routes to equals, except that it treats nulls properly. Reference equal...