Overview
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Speed up and improve your development of full-featured web applications. Explore built-in features of models and associations in Ruby on Rails and apply these to a sample project.
Syllabus
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Introduction
- Let ActiveRecord objects manage your data
- What you should know
- Using the exercise files on GitHub
- Non-database attributes
- Smart models by design
- More ActiveRecord query methods
- Query data selection
- Named scopes
- Challenge: Named scopes
- Solution: Named scopes
- Overview of validation methods
- Write validations
- Use the multipurpose validates method
- Write custom validations
- How to skip validations
- Challenge: Validations
- Solution: Validations
- Overview of callbacks
- Use callbacks to automate actions
- Execute callbacks conditionally
- How to skip callbacks
- Challenge: Callbacks
- Solution: Callbacks
- Work with associations
- Validate presence with belongs_to
- Destroy dependent-related records
- Has and belongs to many relationships
- Rich join associations
- Traversing a rich join association
- Joining tables during queries
- Next steps
