background preloader

Eloquent ORM

Facebook Twitter

Filter Eloquent relationships "on-the-fly", when you need it. I find more and more Eloquent functions that are rarely used, so continue posting these short tips on the blog. Here’s the next one. Simple Eloquent relationship goes like this. And then you get the data in the Controller: $authors = Author::all(); foreach ($authors as $author) { foreach ($author->books as $book) { // .. do something } } But what if, in some case, you need to get only books that were written this year? Notice: did you know about whereYear() function? Another option is to have a separate relationship function for this: And then load it like this: foreach ($author->booksThisYear() as $book) ... But you probably don’t want to do that because it’s not flexible, so another option is to add filtering query at the time of getting the data.

$authors = Author::with(['books' => function($query) { $query->whereYear('created_at', date('Y')); }])->get(); This is probably the most flexible way – original relationship stays the same, and you use filtering only when you actually needed. Facebook. Eloquent Relationships: The Ultimate Guide – Quick Admin Panel. Eloquent is a powerful Laravel ORM, and it allows to define relationships pretty easily.

But do you know all about its functionality? Let’s check it in this ultimate guide, which will cover all types – one-to-one, one-to-many, many-to-many, and polymorphic relations. In addition to the article, each section will have a mini demo-project with link to GitHub and video explanation. 1. Intro: DB and Foreign Keys Let’s start with basic database theory, almost unrelated to Laravel. To have relationships between database tables, first you still need to take care of database fields and foreign keys. Schema::table('posts', function (Blueprint $table) { $table->integer('user_id')->unsigned(); $table->foreign('user_id')->references('id')->on('users'); }); In this example we’re defining posts.user_id field with foreign key to users.id field.

In pure MySQL, it would look like this: ALTER TABLE posts ADD FOREIGN KEY (user_id) REFERENCES users(id); Here are the main options: 2. HasOne function See this code: Laravel Eloquent Relationships Tutorial Example From Scratch.

Tuts - Copy

Optimize Eloquent Queries with Eager Loading. Object Relational mapping (ORM) makes working with databases amazingly simple. While defining database relationships in an object-oriented way makes it easy to query related model data, developers might not pay attention to the underlying database calls. A standard database optimization for an ORM is eager-loading related data. We will set up some example relationships and then walk through how queries change with and without eager loading. I like to get my hands directly on code and experiment with things, and I hope to illustrate how eager loading works with some examples will further help you understand how to optimize your queries.

Introduction At a basic level, ORMs “lazy” load related model data. Imagine that you were received 100 objects from the database, and each record had 1 associated model (i.e. belongsTo). $posts = Post::published()->get(); $authors = array_map(function($post) { return $post->author->name; }, $posts); Eager Loading Laravel’s Eloquent ORM Setup Migrations Models. Understanding and Using Laravel Eloquent Macros ― Scotch. The ability to define macros for Eloquent relationships is a new feature in Laravel 5.4.

It offers us the flexibility of fetching just a single instance of a hasMany() relationship by defining it in one place and then to utilize it for any related tables in the database with a one to many relationship. As you might be aware, Eloquent is the name of a very simple, yet powerful and expressive ORM (object relational mapping) in Laravel. Getting started with Eloquent in Laravel requires creating a model which corresponds to and represent a particular table within the database. This makes the process of defining relationships and retrieving related models very simple. Eloquent provides some very helpful ways of properly interacting with the tables in the database, thereby making it easy to carry out basic database operations, such as adding, deleting, updating and retrieving a specific record.

Here on Scotch, Chris Sevilleja wrote a well-structured article about Eloquent ORM. A Quick Example.

Eloquent & DB

Eloquent: Getting Started - Laravel - The PHP Framework For Web Artisans. Introduction The Eloquent ORM included with Laravel provides a beautiful, simple ActiveRecord implementation for working with your database. Each database table has a corresponding "Model" which is used to interact with that table. Models allow you to query for data in your tables, as well as insert new records into the table.

Before getting started, be sure to configure a database connection in config/database.php. For more information on configuring your database, check out the documentation. Defining Models To get started, let's create an Eloquent model. The easiest way to create a model instance is using the make:model Artisan command: php artisan make:model User If you would like to generate a database migration when you generate the model, you may use the --migration or -m option: php artisan make:model User --migration php artisan make:model User -m Eloquent Model Conventions <?

Table Names Note that we did not tell Eloquent which table to use for our Flight model. <? Primary Keys Timestamps.

Getting Started

Relationships. Collections. Mutators. API Resources. Serialization.