Tutorial by Examples: ed

Assuming the route: resources :users, only: [:index] You can redirect to a different URL using: class UsersController def index redirect_to "http://stackoverflow.com/" end end You can go back to the previous page the user visited using: redirect_to :back Note that i...

The following query returns the database options and metadata: select * from sys.databases WHERE name = 'MyDatabaseName';

// Only accept T and U generic types that also implement Debug fn print_objects<T: Debug, U: Debug>(a: T, b: U) { println!("A: {:?} B: {:?}", a, b); } print_objects(13, 44); // or annotated explicitly print_objects::<usize, u16>(13, 44); The bounds must cover a...

The jQuery API may be extended by adding to its prototype. For example, the existing API already has many functions available such as .hide(), .fadeIn(), .hasClass(), etc. The jQuery prototype is exposed through $.fn, the source code contains the line jQuery.fn = jQuery.prototype Adding functio...

Generally, dialog relies on a div within the HTML. Sometimes you may want to create a dialog from scratch, programmatically. Here is an example of a complex modal dialog created dynamically with interactive functions. HTML <div id="users-contain" class="ui-widget"> &lt...

This design pattern is useful for generating a sequence of asynchronous actions from a list of elements. There are two variants : the "then" reduction, which builds a chain that continues as long as the chain experiences success. the "catch" reduction, which builds a chain t...

Events that work with most form elements (e.g., change, keydown, keyup, keypress) do not work with contenteditable. Instead, you can listen to changes of contenteditable contents with the input event. Assuming contenteditableHtmlElement is a JS DOM object that is contenteditable: contenteditableH...

If no ordering function is passed, std::sort will order the elements by calling operator< on pairs of elements, which must return a type contextually convertible to bool (or just bool). Basic types (integers, floats, pointers etc) have already build in comparison operators. We can overload this ...

Model with ForeignKey We will work with these models : from django.db import models class Book(models.Model): name= models.CharField(max_length=50) author = models.ForeignKey(Author) class Author(models.Model): name = models.CharField(max_length=50) Suppose we often (always) access ...

DataFrame: import pandas as pd import numpy as np np.random.seed(5) df = pd.DataFrame(np.random.randint(100, size=(5, 5)), columns = list("ABCDE"), index = ["R" + str(i) for i in range(5)]) df Out[12]: A B C D E R0 99 78 61 16 73...

Alamofire.request(.GET, "https://httpbin.org/get") .validate() .responseString { response in print("Response String: \(response.result.value)") } .responseJSON { response in print("Response JSON: \(response.result.value)") ...

Extension methods can be used for writing strongly typed wrappers for dictionary-like objects. For example a cache, HttpContext.Items at cetera... public static class CacheExtensions { public static void SetUserInfo(this Cache cache, UserInfo data) => cache["UserInfo"] ...

In order to enable EdgeCache, set the following HTTP response headers (Do not deviate from this exact format): Cache-Control header to public, max-age=X where: X = the number of seconds that you want the response to be cached for X > 60 seconds X < 365*24*60*60 Set the Pragma he...

Drop Table MyTable;

MySQL3.19 DROP TABLE IF EXISTS MyTable; PostgreSQL8.x DROP TABLE IF EXISTS MyTable; SQL Server2005 If Exists(Select * From Information_Schema.Tables Where Table_Schema = 'dbo' And Table_Name = 'MyTable') Drop Table dbo.MyTable SQLite3.0 DROP TABLE IF EXI...

Example Using Activity w/ LocationRequest /* * This example is useful if you only want to receive updates in this * activity only, and have no use for location anywhere else. */ public class LocationActivity extends AppCompatActivity implements GoogleApiClient.ConnectionCallbacks, ...

XML elements often nest, have data in attributes and/or as character data. The way to capture this data is by using ,attr and ,chardata respectively for those cases. var doc = ` <parent> <child1 attr1="attribute one"/> <child2>and some cdata</child2> </p...

Using the Android API 23 or higher, very often such situation can be seen: This situation is caused by the structural change of the Android API regarding getting the resources. Now the function: public int getColor(@ColorRes int id, @Nullable Theme theme) throws NotFoundException should ...

JavaScript has a predefined collection of reserved keywords which you cannot use as variables, labels, or function names. ECMAScript 1 1 A — EE — RS — Zbreakexportsupercaseextendsswitchcatchfalsethisclassfinallythrowconstfortruecontinuefunctiontrydebuggeriftypeofdefaultimportvardeleteinvoiddoneww...

Mage::app()->getStore()->getIsActive();