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How to find third or nth maximum salary from salary table?
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edited Sep 27 '17 at 7:32
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Rails Observer Alternatives for 4.0
...ef do_something
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end
end
Next, include that in the models you wish to run the after_save in:
class MyModel < ActiveRecord::Base
include MyConcernModule
end
Depending on what you're doing, this might get you close without observers.
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Different ways of clearing lists
Is there any reason to do anything more complicated than one of these two lines when you want to clear a list in Python?
8 ...
Apache Commons equals/hashCode builder [closed]
... overhead (with and without hibernate). But as Alain writes, the Guava way is even nicer:
Here's a sample Bean:
public class Bean{
private String name;
private int length;
private List<Bean> children;
}
Here's equals() and hashCode() implemented with Commons/Lang:
@Override
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Testing two JSON objects for equality ignoring child order in Java
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As a general architectural point, I usually advise against letting dependencies on a particular serialization format bleed out beyond your storage/networking layer; thus, I'd first recommend that you consider testing equality between your own application objects rather th...
Can't launch my app in Instruments: At least one target failed to launch
...ll my code signing entitlements set correctly. Running the app on my phone is fine, but launching it in instruments gives me an error message:
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JavaScript naming conventions [closed]
I know there is a lot of controversy (maybe not controversy, but arguments at least) about which naming convention is the best for JavaScript.
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Get list from pandas DataFrame column headers
I want to get a list of the column headers from a pandas DataFrame. The DataFrame will come from user input so I won't know how many columns there will be or what they will be called.
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How to verify an XPath expression in Chrome Developers tool or Firefox's Firebug?
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Chrome
This can be achieved by three different approaches (see my blog article here for more details):
Search in Elements panel like below
Execute $x() and $$() in Console panel, as shown in Lawrence's answer
Third party extensions ...
How to make a div fill a remaining horizontal space?
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This seems to accomplish what you're going for.
#left {
float:left;
width:180px;
background-color:#ff0000;
}
#right {
width: 100%;
background-color:#00FF00;
}
<div>
<div id="left">
le...