Search Results for "where-any-vs-exists-discussion"

Lessons

In this lesson, we will look at using the exists? method from active record to check if any records are returned from a query just like with using .where(..).any? but without the overhead of loading all of the records into memory.

SQL Learning Path - Where Calculations

Apr 01, 2023

In this lesson, we will look at how to use calculations with the where clause to filter the results from our database queries.

10m

SQL Learning Path - Where Clause

Apr 01, 2023

In this lesson, we will look at how to filter the results from our database queries.

Ember Features and Where to Find Them

Nov 21, 2016

Resources on how to learn Ember more deeply

12m

Open Source Vlog - Where Do We Even Start?

Jun 24, 2015

I want to do open source every day. How do we even get started?

Fixing Brittle Tests: Avoid Hardcoded Values

Dec 23, 2019

Test suites often become brittle over time where small changes end up breaking various tests. One way to avoid that is by avoiding using hardcoded values in your test suite.

18m

ActiveSupport Concerns: Making a Soft Deletable module

Feb 12, 2015 Pro

An introduction to Ruby on Rails ActiveSupport concerns where we build a Soft Deletable module like the Paranoia gem

37m

Syncing Repositories with Ruby Scripts - Part 2

Dec 25, 2023

In this lesson, we will pick up where we left off in the last part and package up our script into a gem that we can share. Along the way, we'll look at how we can spread responsibility across a few small classes to separate concerns and hopefully make the

URL Shortener Requirements

Sep 18, 2023 Pro

We're going to build a URL Shortener in Rails, so where do we start? In this lesson, we'll plan out our project and the features we want to build.

16m

Adding a Blog Post Show Action

Apr 03, 2023

We need a way to view individual Blog Posts on their own URLs now. That's where our Show action comes into play and we will learn how to build that in this lesson.

10m

How to use the MQTT Protocol with Ruby

Aug 22, 2022

MQTT is a message protocol for Internet of Things devices. It's very similar to pubsub where you can broadcast and subscribe to different topics. Learn how to send messages to an MQTT broker in this tutorial.

12m

Lazy Requiring Dependencies in Ruby

Feb 03, 2025 Pro

Normally, we require dependencies at the top of files, but today we'll see where and when we might want to lazily require dependencies.

10m

Custom ActionText Sanitizer & Scrubber in Rails

Nov 14, 2022 Pro

ActionText is secure by default, but sometimes you need more control over the sanitization. That's where custom sanitizers and scrubbers come in and we'll learn how to use these.

12m

ActiveRecord Default Scopes, Unscoped, and Unscope

Jun 22, 2021 Pro

ActiveRecord default_scopes are incredibly useful for some features like soft delete. But sometimes we need to undo a scope, so that's where unscope comes in.

Hash Fetch with Default Value

Jan 27, 2025 Pro

In this screencast, we explore Ruby's Hash#fetch method and how it handles default values. We show how providing a direct default value vs a block affects performance, especially important in Rails apps where unnecessary operations can impact speed.

23m

Concept Application: Assert Difference Deep Dive

Apr 25, 2022

In this video, we will explore how the concepts we looked at in "Flattening Scopes in Ruby" are used in Rails by taking a look at the assert_difference method. We will walk through how the method works while taking note of where the concepts are applied.

33m

Syncing Repositories with Ruby Scripts - Part 1

Dec 18, 2023

In this lesson, we will be looking at getting a v1 of a Ruby script that will fetch, pull, and push across several repositories and remotes to keep our code up-to-date. Hopefully, it will give you ideas for other areas in your workflow where a simple Ruby

10m

Symbols vs Strings

Feb 14, 2019

Ever wondered what the difference between Symbols and Strings were? Why would we use one over the other when most languages only have strings?

11m

Notifications for ActionText User Mentions

Jun 05, 2019 Pro

When you at-mention a user, you typically want to send email or other types of notifications to alert that user they were mentioned. In this episode, we'll look into ActionText Content to see how we can extract the user mention attachments and do that.

How to use Mocks in Ruby tests

Jan 13, 2020 Pro

Mocks are a handy tool for writing tests in Ruby. You can use them to fake an object and verify that the correct methods were called against it. Perfect for testing a method that integrates closely with another class or module.

More lesson search results →

Forum Threads

Search Results for "where-any-vs-exists-discussion"

Lessons

Where Any? vs Exists?

Mar 17, 2050 Pro

SQL Learning Path - Where Calculations

Apr 01, 2023

SQL Learning Path - Where Clause

Apr 01, 2023

Ember Features and Where to Find Them

Nov 21, 2016

Open Source Vlog - Where Do We Even Start?

Jun 24, 2015

Fixing Brittle Tests: Avoid Hardcoded Values

Dec 23, 2019

ActiveSupport Concerns: Making a Soft Deletable module

Feb 12, 2015 Pro

Syncing Repositories with Ruby Scripts - Part 2

Dec 25, 2023

URL Shortener Requirements

Sep 18, 2023 Pro

Adding a Blog Post Show Action

Apr 03, 2023

How to use the MQTT Protocol with Ruby

Aug 22, 2022

Lazy Requiring Dependencies in Ruby

Feb 03, 2025 Pro

Custom ActionText Sanitizer & Scrubber in Rails

Nov 14, 2022 Pro

ActiveRecord Default Scopes, Unscoped, and Unscope

Jun 22, 2021 Pro

Hash Fetch with Default Value

Jan 27, 2025 Pro

Concept Application: Assert Difference Deep Dive

Apr 25, 2022

Syncing Repositories with Ruby Scripts - Part 1

Dec 18, 2023

Symbols vs Strings

Feb 14, 2019

Notifications for ActionText User Mentions

Jun 05, 2019 Pro

How to use Mocks in Ruby tests

Jan 13, 2020 Pro

Forum Threads

Where Any? vs Exists? Discussion

Setup Ubuntu 16.04 Xenial Xerus Discussion

Inviting Users with devise_invitable Discussion

Deploy Ubuntu 14.04 Trusty Tahr Discussion

Pull data from another table in a lookup

Rails 5.2 - Encrypted Credentials Discussion

Preferences & Settings with ActiveRecord::Store Discussion

Advanced Caching with User Permissions and Authorization Discussion

Rails 6 With Full Vue Frontend vs Sprinkled Vue Components

Best strategy for downloading multiple files from S3

Searchkick: Reindex on model in multitenancy through default scope app

Multi Model Sign-up Wizard

Ruby question - Generating a nested hash with group_by

Structure Guidance - Multi Tenancy Authentication / Authorization

Any Rails code documentation best practices? Yard vs Rdoc?

Where do I start?

Symbols vs Strings Discussion

Spree commerce vs custom solution from scratch

Accepts_nested_attributes vs the regular way.