Define the book review entity

With the book entity in place, you can add a second entity, book_review, to store reviews of those books. The model looks like this:

Adding the book review entity

Open src/main/entities.rell and add the following definition for book_review:

entity book_review {  index book: book;  reviewer_name: text;  review: text;  rating: integer;}

Breakdown of the code

• entity keyword: Declares a new entity, comparable to creating a table in a SQL database.
• index book: book;: This attribute references a book, connecting each review to its book. The index keyword speeds up queries that go through this relationship.
• reviewer_name: text;: Holds the name or alias the reviewer chooses to use.
• review: text;: Holds the review itself as text.
• rating: integer;: Holds the numeric rating given in the review.

These attributes are all you need to start storing book reviews in your Chromia app.