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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...
Convert boolean result into number/integer
... Why? This works on truthiness which is more general and accepts any type (string, number, etcetera.) The unary answer is clever indeed, but if I pass it a string it returns NaN. So if you want L33T and guarantee the input, go urary, otherwise methinks the ternary + truthy test is best.
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What is the difference between the WPF TextBlock element and Label control? [duplicate]
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Label takes all kinds of data inputs like String, Number etc...
TextBlock, as the name suggests, only accepts a Text string.
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Commonly accepted best practices around code organization in JavaScript [closed]
...rmatting capabilities and validation of data and information.
* @ Param {String} mask - mask validation of input data.
*/
Exc.ui.maskedInput = function (mask) {
this.mask = mask;
...
};
/**
* Class <i> domTips </i> used to add an HTML element the ability to present tips an...
How do I get a distinct, ordered list of names from a DataTable using LINQ?
... this
var names = (from DataRow dr in dataTable.Rows
select (string)dr["Name"]).Distinct().OrderBy( name => name );
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Multiline bash commands in makefile
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If you want to break a string in bash/perl/script inside makefile, close the string quote, backslash, newline, (no indentation) open string quote. Example; perl -e QUOTE print 1; QUOTE BACKSLASH NEWLINE QUOTE print 2 QUOTE
–...
How to extract request http headers from a request using NodeJS connect
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To see a list of HTTP request headers, you can use :
console.log(JSON.stringify(req.headers));
to return a list in JSON format.
{
"host":"localhost:8081",
"connection":"keep-alive",
"cache-control":"max-age=0",
"accept":"text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=...
“Notice: Undefined variable”, “Notice: Undefined index”, and “Notice: Undefined offset” using PHP
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Recommended: Declare your variables, for example when you try to append a string to an undefined variable. Or use isset() / !empty() to check if they are declared before referencing them, as in:
//Initializing variable
$value = ""; //Initialization value; Examples
//"" When you want ...
Is there any difference between the `:key => “value”` and `key: “value”` hash notations?
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Ruby hash-keys assigned by hash-rockets can facilitate strings for key-value pairs (e.g. 's' => x) whereas key assignment via symbols (e.g. key: "value" or :key => "value") cannot be assigned with strings. Although hash-rockets provide freedom and functionality for hash-ta...
Vim: What's the difference between let and set?
...ption} Toggle option: set, switch it on. Number option: show value. String option: show value. This doesn't agree with what you have here, when you say 'will set the default value for option wrap'. ??
– Elliptical view
Jul 13 at 22:24
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