Join Kevin Skoglund for an in-depth discussion in this video Introducing migrations, part of Ruby on Rails 4 Essential Training.
…We created a database and configured our Rails project to connect to it.…Next we need to add tables.…We will do that by writing Rails migrations.…A migration is a set of database instructions.…Those instructions are Ruby code, which migrates…our database from one state to another.…Essentially they describe database changes.…In our migration we can create a table, add a column,…change the name of a column, drop a table and much more.…A migration will contain both the instructions for moving up to a…new state, and also instructions for moving back down to the previous state.…
If a migration has instructions to create a table when moving forward or up, it…will also include the instructions to allow it…to move back down by dropping the table.…If you move up by adding three columns to the table then…you'll also have instructions to move back down by removing those three columns.…Being able to move in both the directions…like this allows us to migrate in both directions.…We can migrate our database to the newest…
- Why use Ruby on Rails?
- Installing Ruby on Rails on Mac and Windows
- Rendering templates and redirecting requests
- Generating and running database migrations
- Creating, updating, and deleting records
- Understanding association types
- Using layouts, partials, and view helpers
- Incorporating assets using asset pipeline
- Validating form data
- Authenticating users and managing user access
- Architecting RESTful applications
- Debugging and error handing
Skill Level Intermediate
1. What Is Ruby on Rails?
2. Installing Ruby on Rails on a Mac
3. Installing Ruby on Rails on a Windows Machine
4. Getting Started
5. Controllers, Views, and Dynamic Content
6. Databases and Migrations
7. Models, ActiveRecord, and ActiveRelation
9. Controllers and CRUD
10. Layouts, Partials, and View Helpers
13. Data Validation
14. User Authentication
15. Improving the Simple CMS
16. REST and RESTful Routes
17. Debugging and Error Handling
18. Introducing More Advanced Topics
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