Tutorial by Examples: e

Using BASE_DIR to ensure app portability

It's a bad idea to hard code paths in your application. One should always use relative urls so that your code can work seamlessly across different machines. The best way to set this up is to define a variable like this import os BASE_DIR = os.path.dirname(os.path.dirname(__file__)) Then use th...

Using Environment variables to manage Settings across servers

Using environment variables is a widely used way to setting an app's config depending on it environment, as stated in The Twelve-Factor App. As configurations are likely to change between deployment environments, this is a very interesting way to modify the configuration without having to dig in th...

Enum to string and back

public enum DayOfWeek { Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, Saturday } // Enum to string string thursday = DayOfWeek.Thursday.ToString(); // "Thursday" string seventhDay = Enum.GetName(typeof(DayOfWeek), 6); // "Satur...

Using Join in an Update

Joins can also be used in an UPDATE statement: CREATE TABLE Users ( UserId int NOT NULL, AccountId int NOT NULL, RealName nvarchar(200) NOT NULL ) CREATE TABLE Preferences ( UserId int NOT NULL, SomeSetting bit NOT NULL ) Update the SomeSetting column of the Prefere...

Transforming the elements of an Array with map(_:)

As Array conforms to SequenceType, we can use map(_:) to transform an array of A into an array of B using a closure of type (A) throws -> B. For example, we could use it to transform an array of Ints into an array of Strings like so: let numbers = [1, 2, 3, 4, 5] let words = numbers.map { Stri...

Extracting values of a given type from an Array with flatMap(_:)

The things Array contains values of Any type. let things: [Any] = [1, "Hello", 2, true, false, "World", 3] We can extract values of a given type and create a new Array of that specific type. Let's say we want to extract all the Int(s) and put them into an Int Array in a safe ...

Dynamic Parameters in Dapper

connection.Execute(@"some Query with @a,@b,@c", new {a=somevalueOfa,b=somevalueOfb,c=somevalueOfc});

Installation or Setup

python-requests is available on PyPI, the Python Package Index, which means it can be installed through pip: pip install requests Up-to-date source code can be found on the requests GitHub repository If you wish to install it from source, you can do this by either cloning the GitHub repository:...

GET a remote JSON resource

This snippet will grab a JSON formatted resource, decode it and print it in PHP array format. // Fetch $response = wp_remote_get( 'http://www.example.com/resource.json' ); if ( ! is_wp_error( $response ) ) { $headers = wp_remote_retrieve_headers( $response ); if ( isset( $headers[ 'con...

Media Queries

Media Queries in Bootstrap allow you to move, show and hide content based on the viewport size. The following media queries are used in LESS files to create the key breakpoints in the Bootstrap grid system: /* Small devices (tablets, 768px and up) */ @media (min-width: @screen-sm-min) { ... } /...

Basic Template

<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta http-equiv="X-UA-Compatible" content="IE=edge"> <meta name="viewport" content="width=device-widt...

Searching

Jumping to characters f{char} - move to the next occurrence of {char} to the right of the cursor on the same line F{char} - move to the next occurrence of {char} to the left of the cursor on the same line t{char} - move to the left of the next occurrence of {char} to the right of the cursor on th...

Modifying keys and values

You can create a new hash with the keys or values modified, indeed you can also add or delete keys, using inject (AKA, reduce). For example to produce a hash with stringified keys and upper case values: fruit = { name: 'apple', color: 'green', shape: 'round' } # => {:name=>"apple",...

ThenBy

ThenBy can only be used after a OrderBy clause allowing to order using multiple criteria var persons = new[] { new {Id = 1, Name = "Foo", Order = 1}, new {Id = 1, Name = "FooTwo", Order = 2}, new {Id = 2, Name = "Bar", Order = 2}, new {Id = 2, Nam...

Running a Seeder

You may add your new Seeder to the DatabaseSeeder class. /** * Run the database seeds. * * @return void */ public function run() { $this->call(UserTableSeeder::class); } To run a database seeder, use the Artisan command php artisan db:seed ...

Creating a Seed

Database seeds are stored in the /database/seeds directory. You can create a seed using an Artisan command. php artisan make:seed UserTableSeeder Alternatively you can create a new class which extends Illuminate\Database\Seeder. The class must a public function named run().

Inserting Data using a Seeder

You can reference models in a seeder. use DB; use App\Models\User; class UserTableSeeder extends Illuminate\Database\Seeder{ public function run(){ # Remove all existing entrie DB::table('users')->delete() ; User::create([ 'name' => 'Admin', ...

Hello World

There are two things you will need to know when writing a "hello world" application in Erlang: The source code is written in the erlang programming language using the text editor of your choice The application is then executed in the erlang virtual machine. In this example we will inte...

Simple data structures

Structure data types are useful way to package related data and have them behave like a single variable. Declaring a simple struct that holds two int members: struct point { int x; int y; }; x and y are called the members (or fields) of point struct. Defining and using structs: ...

Trim empty spaces

Trim is used to remove write-space at the beginning or end of selection In MSSQL there is no single TRIM() SELECT LTRIM(' Hello ') --returns 'Hello ' SELECT RTRIM(' Hello ') --returns ' Hello' SELECT LTRIM(RTRIM(' Hello ')) --returns 'Hello' MySql and Oracle SELECT TRIM(' Hello ') ...

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