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Rails migration: t.references with alternative name?
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You can do it this way:
create_table :courses do |t|
t.string :name
t.references :transferrable_as
t.references :same_as
t.timestamps
end
or using t.belongs_to as an alias for t.references
You can't add foreign_key: true to those two references lines. If you want to mark t...
What does PermGen actually stand for?
...Briefly, it contains the Java objects associated with classes and interned strings. In Sun's client implementation with sharing on, classes.jsa is memory mapped to form the initial data, with about half read-only and half copy-on-write.
Java objects that are merely old are kept in the Tenured Gener...
GUI-based or Web-based JSON editor that works like property explorer [closed]
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Generally when I want to create a JSON or YAML string, I start out by building the Perl data structure, and then running a simple conversion on it. You could put a UI in front of the Perl data structure generation, e.g. a web form.
Converting a structure to JSON is very...
What is the difference (if any) between Html.Partial(view, model) and Html.RenderPartial(view,model)
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The only difference is that Partial returns an MvcHtmlString, and must be called inside <%= %>, whereas RenderPartial returnsvoid and renders directly to the view.
If you look at the source code, you'll see that they both call the same internal method, passing a StringWri...
Clearing NSUserDefaults
...Defaults] to store application settings. This consists of roughly a dozen string values. Is it possible to delete these values permanently instead of just setting them to a default value?
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Launching an application (.EXE) from C#?
...t this article on how to use it.
Process.Start("notepad", "readme.txt");
string winpath = Environment.GetEnvironmentVariable("windir");
string path = System.IO.Path.GetDirectoryName(
System.Windows.Forms.Application.ExecutablePath);
Process.Start(winpath + @"\Microsoft.NET\Framework...
Express-js wildcard routing to cover everything under and including a path
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Passing in an array of strings is preferential to me as well. Unfortunately: passing an array to app.VERB() is deprecated and will be removed in 4.0
– CodeWarrior
Jul 26 '13 at 16:36
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Why exactly is eval evil?
...s non-Lisp languages, because in those languages, eval() typically takes a string argument, and the user's input is typically spliced in. The user can include a quote in their input and escape into the generated code. But in Lisp, EVAL's argument is not a string, and user input cannot escape into th...
Linux日志管理Rsyslog入门 - C/C++ - 清泛网 - 专注IT技能提升
...设置App服务器：
module(load="imtcp")
template(name="msg" type="string" string="%msg:2:$%\n")
ruleset(name="analysis") {
action(type="omfile"
File="/path/to/access.log"
Template="msg")
stop
}
input(type="imtcp"
Port="<PORT>"
Ruleset="analysis...
Iterating over Java collections in Scala
...= it.hasNext
override def next() = it.next()
}
val jIterator: Iterator[String] = ... // iterating over a large dataset
scalaIterator(jIterator).take(2).map(_.length).foreach(println) // only first 2 elements are loaded to memory
It has similar concept but less verbose IMO :)
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