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How to get the original value of an attribute in Rails
...iginal value that an ActiveRecord attribute (=the value that was loaded from the database)?
4 Answers
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How can I catch a “catchable fatal error” on PHP type hinting?
I am trying to implem>me m>nt Type Hinting of PHP5 on one of my class,
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What is the difference between up-casting and down-casting with respect to class variable
... a type check and can throw a ClassCastException.
In your case, a cast from a Dog to an Animal is an upcast, because a Dog is-a Animal. In general, you can upcast whenever there is an is-a relationship between two classes.
Downcasting would be som>me m>thing like this:
Animal animal = new Dog();
Dog c...
What is the difference between Directory.Enum>me m>rateFiles vs Directory.GetFiles?
What is the difference between Directory.Enum>me m>rateFiles vs GetFiles ?
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Can we have multiple “WITH AS” in single sql - Oracle SQL
I had a very simple question: Does oracle allow multiple "WITH AS" in a single sql statem>me m>nt.
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How do I delete a Git branch with TortoiseGit
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You should read this article: Remote branches with TortoiseGit
According to this blog post:
...remove the local branch by first opening up the Checkout/Switch dialog to get at the Browse refs dialog.
In the Browse refs dialog we can right click on the ...
TypeScript: problems with type system
I'm just testing typescript in VisualStudio 2012 and have a problem with its type system. My html site has a canvas tag with the id "mycanvas". I'm trying to draw a rectangle on this canvas. Here's the code
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How can I truncate a datetim>me m> in SQL Server?
What's the best way to truncate a datetim>me m> value (as to remove hours minutes and seconds) in SQL Server 2008?
13 Answers
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Compare integer in bash, unary operator expected
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Your problem arises from the fact that $i has a blank value when your statem>me m>nt fails. Always quote your variables when performing comparisons if there is the slightest chance that one of them may be empty, e.g.:
if [ "$i" -ge 2 ] ; t...
What is &amp used for
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& is HTML for "Start of a character reference".
& is the character reference for "An ampersand".
&current; is not a standard character reference and so is an error (browsers may try to perform error recovery b...