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How to implement the activity stream in a social network
...vity is related to. So if the activity type means "added favorite" then I know that the source_id refers to the ID of a favorite record.
The parent_id/parent_type are useful for my app - they tell me what the activity is related to. If a book was favorited, then parent_id/parent_type would tell m...
How to add images in select list?
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2020 now and still no way to do this.
– Wingsuit
Apr 7 at 4:20
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Why does this Java code compile?
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int x = x + 1;
first we need to compute x+1 but the value of x is not known so you get an error (the compiler knows that the value of x is not known)
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Ignore mouse interaction on overlay image
I have a menu bar with hover effects, and now I want to place a transparent image with a circle and a "handdrawn" text over one of the menu items. If I use absolute positioning to place the overlay image above the menu item, the user will not be able to click the button and the hover effect will not...
how does multiplication differ for NumPy Matrix vs Array classes?
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the key things to know for operations on NumPy arrays versus operations on NumPy matrices are:
NumPy matrix is a subclass of NumPy array
NumPy array operations are element-wise (once broadcasting is accounted for)
NumPy matrix operations foll...
Haskell error parse error on input `='
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@Bakuriu LYAH does now mention let. But a follow-up. In LYAH I read addThree :: Int -> Int -> Int -> Int (newline) addThree x y z = x + y + z but only the second one runs in GHCi with let. Why?
– isomorphismes
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How to override to_json in Rails?
...e creation of the json should be separate from the rendering of the json.
Now, anytime to_json is called on an object, as_json is invoked to create the data structure, and then that hash is encoded as a JSON string using ActiveSupport::json.encode. This happens for all types: object, numeric, date,...
jQuery: select an element's class and id at the same time?
...s one did:
$('#country .save')
so my conclusion is to use the space. Now I don't know if it's to the new version of jQuery that I'm using (1.5.1), but anyway hope this helps to anyone with similar problem that I've had.
edit: Full credit for explanation (in the comment to Alex's answer) goes ...
Alarm Manager Example
...ontext.ALARM_SERVICE ));
// set alarm to fire 5 sec (1000*5) from now (SystemClock.elapsedRealtime())
manager.set( AlarmManager.ELAPSED_REALTIME_WAKEUP, SystemClock.elapsedRealtime() + 1000*5, pintent );
}
Remember though that the AlarmManager fires even when your application ...
Neo4j - Cypher vs Gremlin query language
... 100-200 times faster. We did so and got easily factor 60 out of it. As of now we have no single Cypher query in our system due to lack of confidence. Easy Cypher queries are easy to write in Java, complex queries won't perform. The problem is when you have multiple conditions in your query there is...