#eager loading

Eager Loading Nedir?

Web uygulamaları geliştirirken, veritabanı sorguları ve veri yönetimi, performans üzerinde belirleyici bir rol oynar. Bu bağlamda, Eager Loading, verilerinizi sorgulama ve yönetme biçimi olarak önemli bir kavramdır. Bu makalede, Eager Loading'in ne olduğunu, avantajlarını, dezavantajlarını ve web geliştirme sürecinde nasıl kullanılabileceğini detaylı bir şekilde ele alacağız.

Eager Loading, özellikle ilişkisel veritabanlarıyla çalışırken, ana sorgu çalıştırıldığında ilişkili tüm verilerin hemen yüklenmesi yöntemidir. Bu, bir veri tablosu ile ilişkili diğer tabloların verilerinin tek bir sorgu ile önceden yüklenmesi anlamına gelir. Örneğin, bir e-ticaret sitesinde müşterilerin siparişlerini gösterirken, müşteri bilgileri, sipariş detayları ve ürün bilgileri tek bir sorguyla çekilebilir. Bu yöntem, gereksiz sorgu sayısını azaltarak ve sayfa yükleme süresini kısaltarak performansı artırabilir.

Laravel 5.8 Tutorial From Scratch – e42 – Lazy Loading vs. Eager Loading (Fixing N + 1 Problem) – Laravel

Laravel 5.8 Tutorial From Scratch – e42 – Lazy Loading vs. Eager Loading (Fixing N + 1 Problem) – Laravel

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You may have heard these fancy terms or read them in a blog post but what do they mean? In this lesson, we are diving deep to find out what it means, how to detect it and ultimately how to fix and avoid it.

For the best experience, follow along in our interactive school at https://www.…

It has been stressed that applying conditions or sorting on an Eager Loading Query may have unintended consequences.

May refer to the following:-

http://api.rubyonrails.org/classes/ActiveRecord/Associations/ClassMethods.html#label-Eager+loading+of+associations

http://snaprails.tumblr.com/post/234198162/eager-loading

http://stackoverflow.com/questions/9642900/eager-loading-the-right-way-to-do-things

http://guides.rubyonrails.org/active_record_querying.html#specifying-conditions-on-eager-loaded-associations

That is if you have the following,

posts.includes(:comments, :commenters).where("comments.created_at > ?", 1.week.ago)

You probably expect to get all the posts with comments and commenters eager loaded, BUT the comments should be filtered to be all later than 1 week ago.

However, you will find that the result you would get is - all posts with comments that were created more than 1.week.ago, the other posts will not be returned in the result.

Solution?

You can specify an association with condition in the Post model like so,

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I saw a lot of questions regarding Java & Ruby, but i don't know any of these languages, and I find it hard to read code. I don't know what's supposed to do in the first place.

There are three terms of loading for faster application/start up.

Eager loading: you do everything when asked. Classic example is when you multiply two matrices. You do all the calculations. That's eager loading.

Lazy loading: you only do a calculation when required. In the previous example, you don't do any calculations until you access an element of the result matrix and.

Over-eager loading: this is where you try and anticipate what the user will ask for and pre-load it.

See a "Webby" example...

Imagine a page with roll-over images like for menu items or navigation. There are three ways the image loading could work on this page:

Eager: Load every single image required before you render the page.

Lazy: Load only the displayed images on page load and load the others if/when they are required.

preload_associations is your friend.