Rails allows developers to define relationships between models using “associations” and then work with those associations in an object-oriented way. Learn about the different relationship types between database tables—one to one, one to many, many to many—and then how to use Rails associations to define each relationship type.
- [Instructor] In the previous chapter,…when we were creating, reading,…updating, and deleting records,…we were working with a single model,…in a single database table,…but what if we want to work…with the data in related tables?…After all, that's kind of the point…of working with relational databases.…We could query for a record,…then read the value of its foreign key,…and then make a second query using that foreign key…in our query conditions to find the related record.…That would be a valid approach, but it's a little tedious.…It would be better if we could…define relationships between our models,…and therefore between our tables,…and then work with those relationships…in an object oriented way,…and let Rails handle the behind the scenes work for us.…
ActiveRecord provides something called associations…that allow us to define these relationships.…Let's start by talking about…the different relationship types,…and then learn how Rails handles each one.…There are three main relational database types,…one-to-one, one-to-many, and many-to-many.…
Author
Kevin Skoglund
Released
9/28/2016- Creating and configuring a new Ruby on Rails project
- Generating controllers and views
- Handling server requests
- Using different types of routes
- Rendering and viewing templates
- Generating migrations and models
- Creating, updating, and deleting records
- Finding records with queries
- Understanding relationship types
- Writing controllers for CRUD
- Working with layouts and helpers
- Managing application assets
- Building forms
- Validating data
- Authenticating users
Skill Level Beginner
Duration
Views
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Introduction
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Welcome1m 4s
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1. What Is Ruby on Rails?
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2. Get Started
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Create a project6m 45s
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Configure a project10m 15s
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File structure of a project4m 28s
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Access a project3m 38s
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Routes9m 12s
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Experiment on your own1m 17s
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3. Controllers, Views, and Dynamic Content
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Redirect actions6m 4s
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View templates7m 4s
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Instance variables3m 56s
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Links6m 11s
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URL parameters7m 24s
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4. Databases and Migrations
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Introduction to databases7m 53s
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Create a database2m 27s
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Migrations3m 4s
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Generate migrations4m 3s
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Generate models7m 58s
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Run migrations8m 22s
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Migration methods7m 47s
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Solve migration problems5m 41s
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5. Models and ActiveRecord
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Model naming5m 52s
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Model attributes2m 51s
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The Rails console3m 17s
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Create records4m 53s
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Update records3m 16s
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Delete records2m 29s
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Find records5m 48s
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Query methods: Conditions7m 39s
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Named scopes8m 26s
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6. Associations
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Relationship types7m 2s
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One-to-one associations9m 42s
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One-to-many associations7m 54s
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Many-to-many associations: Rich10m 17s
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Traverse a rich association5m 24s
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7. CRUD, REST, and Resourceful Routes
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CRUD6m 56s
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REST5m 51s
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Resourceful routes6m 54s
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Resourceful URL helpers4m 5s
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8. Controllers and CRUD
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Read action: Index6m 31s
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Read action: Show5m 22s
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Form basics5m 13s
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Create action: New4m 54s
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Create action: Create5m 27s
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Strong parameters6m 33s
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Update actions: Edit/update7m 53s
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Flash hash7m 28s
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9. Layouts, Partials, and View Helpers
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Layouts8m 33s
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Partial templates4m 43s
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Text helpers4m 32s
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Number helpers4m 22s
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Date and time helpers3m 39s
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Custom helpers5m 22s
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Sanitization helpers8m 53s
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10. Assets
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Asset pipeline4m 49s
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Stylesheets12m 1s
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JavaScript7m 33s
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Images6m 22s
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11. Forms
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Form helpers8m 35s
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Form options helpers8m 45s
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Date and time form helpers6m 16s
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Form errors7m 36s
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12. Data Validation
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Validation methods11m 37s
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Write validations12m 7s
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Validates method3m 15s
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Custom validations6m 12s
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13. Controller Features
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Cookies3m 10s
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Sessions6m 50s
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Controller filters10m 45s
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Logging7m 40s
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14. User Authentication
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Secure passwords8m 35s
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Login and logout8m 29s
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Restrict access7m 36s
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15. Improve the Simple CMS
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Challenge: AdminUser CRUD2m 44s
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Solution: AdminUser CRUD7m 56s
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Public area10m 35s
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Public area navigation6m 3s
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Nesting pages in subjects9m 44s
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Nesting sections in pages7m 37s
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Finishing touches3m 30s
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Conclusion
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Next steps1m 44s
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Video: Relationship types