rails study group day 6

interacting with our models

Transcript

1. Rails Study Group
2. Pull Request • make code changes in feature branch • git checkout -b feature/my_feature_branch • commit your code • use github to make a pull request
3. Git Flow • to start: always git pull origin <branch> • git checkout -b feature/my_feature_branch • write the code! • commit your code • git add path/to/files • git commit -m “your commit message” • git push • use github.com to make a pull request
4. MVC
5. MVC
6. MVC
7. MVC
8. MVC
9. MVC
10. Model
11. Create • your_variable = Model.new • your_model.save • your_model.save!
12. Validity • valid? • presence • length • format • uniqueness • roll your own!
13. Find • Model.find(:id) • Model.find_by(attribute: value) • Model.find_by_attribute(value)
14. Index • Do you want to find a model by attribute? • Prevents “full table scan” • To add index • rails g migration AddIndexToTableColumn
15. Update • updates update_at timestamp • direct update with resave • update_attribute(:attribute, value) • update_attributes(attribute1: value, attribute2:value)
16. Destroy • a_model_instance.destroy
17. Tests • Especially important for teams without QA • Ruby is dynamically typed - make sure you get what you are expecting • Provides a developer confidence in their code
18. Tests • They are auto-magically created for you!
19. Tests (green)
20. Tests (red)
21. Model Errors