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How to override to_json in Rails?
... the one you have encountered. The 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 ...
Why does instanceof return false for some literals?
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Primitives are a different kind of type than objects created from within Javascript. From the Mozilla API docs:
var color1 = new String("green");
color1 instanceof String; // returns true
var color2 = "coral";
color2 instanceof String; // returns false (color2 is not a String object)
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Setting Icon for wpf application (VS 08)
... This worked for me. However, it appears that when running the application from the VS debugger (ie pressing F5), the 'generic' icon is still shown. However, running without the debugger (ie ctrl + f5, or from desktop etc) shows the custom icon, as expected.
– Tom
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How to delete a cookie?
...Here is an implementation of a delete cookie function with unicode support from Mozilla:
function removeItem(sKey, sPath, sDomain) {
document.cookie = encodeURIComponent(sKey) +
"=; expires=Thu, 01 Jan 1970 00:00:00 GMT" +
(sDomain ? "; domain=" + sDomain :...
How to return an empty ActiveRecord relation?
...ils 4
In Rails 4, a chainable ActiveRecord::NullRelation will be returned from calls like Post.none.
Neither it, nor chained methods, will generate queries to the database.
According to the comments:
The returned ActiveRecord::NullRelation inherits from
Relation and implements the Null Obje...
What is the “->” PHP operator called and how do you say it when reading code out loud? [closed]
...omes, what do you call -> in C/C++ where it has different functionality from the actual dot operator?
– user229044♦
Sep 17 '10 at 16:53
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What is the difference between aggregation, composition and dependency? [duplicate]
...n - separable part to whole. The part has a identity of its own, separate from what it is part of. You could pick that part and move it to another object. (real world examples: wheel -> car, bloodcell -> body)
Composition - non-separable part of the whole. You cannot move the part to anothe...
What's the best free C++ profiler for Windows? [closed]
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If you're using a Windows binary from the gcc stack, this is a great choice - AMD CodeAnalyst doesn't recognize gcc symbols on Windows, but very sleepy does!
– Mike
Feb 12 '12 at 1:48
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Getting View's coordinates relative to the root layout
... if that works.
It should recursively just add the top and left positions from each parent container.
You could also implement it with a Point if you wanted.
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Choosing between std::map and std::unordered_map [duplicate]
...ook). This also manifests in other indirect ways like: (1) Start iterating from the iterator returned by find(), or (2) existence of member functions like lower_bound().
Also, I think there is some difference in the worst case search complexity.
For map, it is O( lg N )
For unordered_map, it is O...