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Active Record Transactions can be applied to Model classes as well as Model instances, the objects within the transaction block need not all be instances of same class. This is because transactions are per-database connection, not per-model. For example: User.transaction do account.save! prof...

Using Oracle SQL’s NVL2() function, you can create a display column which contains one value if a field contains data and another value if a field does not contain data. For example, in an Entity search, turn the presence of a primary e-mail address into a text display column: NVL2( {email} , 'YES...

Below is a single hidden layer Multilayer Perceptron (MLP) using nested scoping of variables. def weight_variable(shape): return tf.get_variable(name="weights", shape=shape, initializer=tf.zeros_initializer(dtype=tf.float32)) def bias_variable(shape): ...

Application visits are initiated by clicking a Turbolinks-enabled link, or programmatically by calling Turbolinks.visit(location) By default, the visit function uses the 'advance' action. More understandably, the default behavior for the visit function is to advance to the page indicated by the ...

Turbolinks provides an event listener that can be used to stop visits from occurring. Listen to the turbolinks:before-visit event to be notified when a visit is about to commence. In the event handler, you can use: // pure javascript event.data.url or // jQuery $event.originalEvent.data.url...

Since 1.7 there's a java.util.BitSet class that provides simple and user-friendly bit storage and manipulation interface: final BitSet bitSet = new BitSet(8); // by default all bits are unset IntStream.range(0, 8).filter(i -> i % 2 == 0).forEach(bitSet::set); // {0, 2, 4, 6} bitSet.set(3);...

To allow multiple user registration on Ejabberd server, we need to configure file ejabberd.yml in Ejabberd latest versions. Configure ejabberd.yml like: in access_rules: add register: - allow register_from: - allow registration_timeout: - infinity mod_register: acc...

Optionals type, which handles the absence of a value. Optionals say either "there is a value, and it equals x" or "there isn't a value at all". An Optional is a type on its own, actually one of Swift’s new super-powered enums. It has two possible values, None and Some(T), where ...

on your elements.html file, run the following commands: cd PATH/TO/IMPORTFILE/ vulcanize elements.html -o elements.vulc.html --strip-comments --inline-css --inline-js crisper --source elements.vulc.html --html build.html --js build.js Vulcanize retrieved source code of all the imports, then re...

CleverTapAPI cleverTap; try { cleverTap = CleverTapAPI.getInstance(getApplicationContext()); } catch (CleverTapMetaDataNotFoundException e) { // thrown if you haven't specified your CleverTap Account ID or Token in your AndroidManifest.xml } catch (CleverTapPermissionsNotSatisfied e) { /...

In your custom application class, override the onCreate() method, add the line below: CleverTapAPI.setDebugLevel(1);

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For this example we will use the Live Test RavenDB instance. We will build a simple console app here which demonstrates the most basic operations: Creation Retrieval by Id Querying Updating Deletion Begin by creating a new Visual Studio solution and add a Console Application project to it...

Because Boxes implement the Deref<Target=T>, you can use boxed values just like the value they contain. let boxed_vec = Box::new(vec![1, 2, 3]); println!("{}", boxed_vec.get(0)); If you want to pattern match on a boxed value, you may have to dereference the box manually. struct...

If you try and create a recursive enum in Rust without using Box, you will get a compile time error saying that the enum can't be sized. // This gives an error! enum List { Nil, Cons(i32, List) } In order for the enum to have a defined size, the recursively contained value must be in...

Requirement is to check if in a form, ‘Online_date’ field is blank or filled. If it is blank, then fill it with current date, on form load. Controller calls ‘$form->createForm()” with type “folder”. In “FolderType”, event subscriber “FolderSubscriber” is added. Controller: $form =...

The visible binding will hide an element by applying style="display: none;" to it when the binding evaluate as falsey. <input type="text" data-bind="textInput: name"> <span class="error" data-bind="visible: isInvalid">Required!</span&...

func Recovery(h http.Handler) http.Handler { return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request){ defer func() { if err := recover(); err != nil { // respondInternalServerError } }() h.ServeHTTP(w , r) }...

new Vue({ el:"#app", data:{ foo: "bar" }, methods:{ doSomethingAsynchronous(){ setTimeout(function(){ // This is wrong! Inside this function, // "this" refers to the window object. this.foo = "baz"; ...

Using the move command, you can move files: @echo off cd C:\Foo\Bat\Baz move /Y Meow.bat "Meow Folder" >nul Meow.bat stands for which file to move. The "Meow Folder" moves Meow.bat to the Meow Folder. /Y says to not prompt for confirmation. Replacing that with /-Y makes ...