Storing Resource as Model
Record-Oriented Data
Data whose attribute is different from each other but with the same structure.
If we want to store the data permanently, it has to live somewhere outside the programming language.
We should convert it between data as stored and data as manipulating.
In Rails, it shall use relationship database like SQL.
Active Record
Create != new, but new and save
.save! and .create! will throw exceptions once saving is failed.
Read
Update and Delete
Summary
update is used more often now!
Summary about Active Record
What’s new in Rails >= 5
Hierarchy is good for managing classes common methods and attributes.
Database and Migration
schema.rb is a executable file which re-create the schema in another database.
Create:
Change:
Summary
