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Rails: Adding an index after adding column
...g technique may be helpful:
rails generate migration AddIndexToUsers name:string:index will generate the following migration:
class AddIndexToUsers < ActiveRecord::Migration
def change
add_column :users, :name, :string
add_index :users, :name
end
end
Delete add_column line and run...
Regex to test if string begins with http:// or https://
I'm trying to set a regexp which will check the start of a string, and if it contains either http:// or https:// it should match it.
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How to get index of object by its property in JavaScript?
...date, numbers and empty values might return false if the actual value is a string. You can use == equal sign if the datatype is of no essence for you.
– David Addoteye
Feb 15 '16 at 12:43
...
Get Current Area Name in View or Controller
...controller/action from the .Values of the RouteData.
public static MvcHtmlString TopMenuLink(this HtmlHelper htmlHelper, string linkText, string controller, string action, string area, string anchorTitle)
{
var urlHelper = new UrlHelper(htmlHelper.ViewContext.RequestContext);
va...
Most lightweight way to create a random string and a random hexadecimal number
What is the most lightweight way to create a random string of 30 characters like the following?
13 Answers
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How can I use Spring Security without sessions?
...ssets on the first load because "the URL contained a potentially malicious String ';'".
– workerjoe
Mar 5 at 17:36
@wo...
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 to estimate how much memory a Pandas' DataFrame will need?
...o stdout. Technically these are kibibytes (KiB), not kilobytes - as the docstring says, "Memory usage is shown in human-readable units (base-2 representation)." So to get bytes would multiply by 1024, e.g. 451.6 KiB = 462,438 bytes.
>>> df.info()
...
memory usage: 70.0+ KB
>>> d...
Entity Framework select distinct name
... select ta.Name).Distinct();
This will give you an IEnumerable<string> - you can call .ToList() on it to get a List<string>.
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What is the difference between String.Empty and “” (empty string)?
In .NET, what is the difference between String.Empty and "" , and are they interchangable, or is there some underlying reference or Localization issues around equality that String.Empty will ensure are not a problem?
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