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OO Design in Rails: Where to put stuff
...e huge ActiveRecord subclasses and huge controllers is quite natural (even if you do use a controller per resource). If you were to create deeper object worlds, where would you put the classes (and modules, I suppose)? I'm asking about views (in the Helpers themselves?), controllers and models.
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What are Runtime.getRuntime().totalMemory() and freeMemory()?
...aximum amount of memory that the Java virtual machine will attempt to use. If there is no inherent limit then the value Long.MAX_VALUE will be returned.
freeMemory()
Returns the amount of free memory in the Java Virtual Machine. Calling the gc method may result in increasing the value returned by...
doGet and doPost in Servlets
...raw URL in browser address bar, etcetera will all fire a HTTP GET request. If a Servlet is listening on the URL in question, then its doGet() method will be called. It's usually used to preprocess a request. I.e. doing some business stuff before presenting the HTML output from a JSP, such as gatheri...
HttpServletRequest to complete URL
...URL().toString());
String queryString = request.getQueryString();
if (queryString == null) {
return requestURL.toString();
} else {
return requestURL.append('?').append(queryString).toString();
}
}
...
Maintain/Save/Restore scroll position when returning to a ListView
...isible list item. But this item may be partially scrolled out of view, and if you want to restore the exact scroll position of the list you need to get this offset. So ListView.getChildAt(0) returns the View for the top list item, and then View.getTop() - mList.getPaddingTop() returns its relative o...
What's an appropriate HTTP status code to return by a REST API service for a validation failure?
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If "validation failure" means that there is some client error in the request, then use HTTP 400 (Bad Request). For instance if the URI is supposed to have an ISO-8601 date and you find that it's in the wrong format or refers...
Postgis installation: type “geometry” does not exist
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Thanks. BTW, If someone using 'psql' to run this code, make sure the role have 'Superuser' attribute/privilege.
– Yang
Dec 12 '15 at 3:09
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SQL Server SELECT into existing table
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SELECT ... INTO ... only works if the table specified in the INTO clause does not exist - otherwise, you have to use:
INSERT INTO dbo.TABLETWO
SELECT col1, col2
FROM dbo.TABLEONE
WHERE col3 LIKE @search_key
This assumes there's only two columns in db...
Rails migration for has_and_belongs_to_many join table
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@hoffmanc It will generate an empty migration file if you do not specify any fields. You must specify the fields if you want Rails to automatically add them to the migration file.
– Andrew
Jan 21 '15 at 19:44
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How to get JSON response from http.Get
...rl string, target interface{}) error {
r, err := myClient.Get(url)
if err != nil {
return err
}
defer r.Body.Close()
return json.NewDecoder(r.Body).Decode(target)
}
Example use:
type Foo struct {
Bar string
}
func main() {
foo1 := new(Foo) // or &Foo{}
...