Ruby on Rails 6 Essential Training: Models and Associations

Course details

Ruby on Rails can speed up and improve your development of full-featured web applications because it provides powerful tools that give structure and automate common data tasks. In this course, learn about the built-in features of models and associations in Rails. Apply named scopes, validations, callbacks, and associations to a sample project. Find out how to build smarter models by adding attributes not in the database and leveraging efficient queries. Walk through the use of available validation methods and helpers. Learn how to implement custom validations and to write and add automatic actions, known as callbacks. Explore effective use of Active Record associations, investigate belongs-to-many relationships and rich associations, and learn how to write queries that span several tables.

Concepts

0. Introduction

01 - Let ActiveRecord objects manage your data
02 - What you should know
03 - Using the exercise files on GitHub

1. Smarter Models

04 - Non-database attributes
05 - Smart models by design
06 - More ActiveRecord query methods
07 - Query data selection
08 - Named scopes
09 - Challenge - Named scopes
10 - Solution - Named scopes

2. Data Validations

11 - Overview of validation methods
12 - Write validations
13 - Use the multipurpose validates method
14 - Write custom validations
15 - How to skip validations
16 - Challenge - Validations
17 - Solution - Validations

3. ActiveRecord Callbacks

18 - Overview of callbacks
19 - Use callbacks to automate actions
20 - Execute callbacks conditionally
21 - How to skip callbacks
22 - Challenge - Callbacks
23 - Solution - Callbacks

4. ActiveRecord Associations

24 - Work with associations
25 - Validate presence with belongs to
26 - Destroy dependent-related records
27 - Has and belongs to many relationships
28 - Rich join associations
29 - Traversing a rich join association
30 - Joining tables during queries

Conclusion

31 - Next steps