Book Exchange App 📚♻️📚

An exercise on Express API creation, Databases and Sequelize.

Objectives

To setup an Express API using node-postgres, Sequelize, Mocha/Chai and Supertest for testing.
Use advanced Sequelize schema validation, error handling and establish complex relationships between database tables.

Planning the project

In order to create this App, I was presented with an imaginary client's requests. I was to create an app that allowed them to do the following:

Display their books to be loaned by other users.
Loan other users' books.
Create an account that would secure their personal information.

I generated an ERD so I could design the database before starting to write any code. This is how I envisioned the project's structure.

I would create the following Models:

Reader ✅

param	data type
Reader_ID	INT (PK)
Name	STRING
Book_ID	INT(FK)

It will include the Book Model data of referenced entries.

Book ✅

param	data type
Book_ID	INT (PK)
Title	STRING
ISBN	STRING
Loaned	BOOLEAN
Reader_ID	INT (FK)
Genre_ID	INT (FK)
Author_ID	INT (FK)
Loan_ID	INT (FK)

It will include the Reader, Genre and Author Model data of referenced entries.

Author ✅

param	data type
Author_ID	INT (PK)
Name	STRING
Book_ID	INT (FK)

Author and Genre are individual models to support searches (by Author, Genre or Book) through the library.

Genre ✅

param	data type
Genre_ID	INT (PK)
Genre	STRING
Book_ID	INT (FK)

Author and Genre are individual models to support searches (by Author, Genre or Book) through the library.

Account 🚧

param	data type
Account_N	INT (PK)
Email	STRING
Password	STRING
Reader_ID	INT (FK)

STILL TO BE IMPLEMENTED:
For now, Account data is stored in the Reader Model.

Loan 🚧

param	data type
Loan_ID	INT (PK)
Date_Loaned	DATE
Date_Returned	DATE
Returned	BOOLEAN
Account_N	INT (FK)
Book_ID	INT (FK)

STILL TO BE IMPLEMENTED

Current Version

This version supports:

Creating your own Reader entry that safely stores your personal information.
Creating & Updating a list of the Books you own.
Search by Author, Genre or Book.

This version does not include the Loan & Account models nor any functionality or parameter related to them. These will be included in further updates.

Set Up

Set up Docker to run a postgres container:

docker run --name postgres -p 5432:5432 -e POSTGRES_PASSWORD=password -d postgres

Run pgAdmin 4 and create a new server:
- hostname/address: localhost
- user: postgres
- password: password
Fork this project. Then clone the repo to your machine:

git clone git@github.com:[your-github-username]/book-library-api

Install the project's dependencies:

npm install

In the root of your project, create a .env file and a .env.test file. Specify in them your environment variables.

    PGPASSWORD=password
    PGDATABASE=book_library_dev
    PGUSER=postgres
    PGHOST=localhost
    PGPORT=5433

Make sure your PGPORT matches the one assigned in your pgAdmin4 Server!

Make sure your PGDATABASE names are different in your .env & .env.test files!

Use the following commands to:

npm test  # Test code.
npm start # Start the app in your preferred port (3000 by default).

You can interact with the API and test its functions through Postman.

API Endpoints

Reader

POST /readers (creates a new reader entry)

Parameters and body content

Parameters Body content

None Name [STRING], Email [STRING], Password [STRING](8 characters or more)

Responses

code description

201 Successful operation

400 Content element empty, null, not unique, not the right format or not the right length

GET /readers (returns all the reader entries)

Parameters and body content

Parameters Body content

None None

Responses

code description

200 Successful operation

404 Entry not found

GET /readers/:id (returns a reader entry by ID)

Parameters and body content

Parameters Body content

Reader_ID None

Responses

code description

200 Successful operation

404 Entry not found

PATCH /readers/:id (updates a reader entry by ID)

Parameters and body content

Parameters Body content

Reader_ID Name [STRING], Email [STRING], Password [STRING](8 characters or more)

Responses

code description

200 Successful operation

404 Entry not found

DELETE /readers/:id (deletes a reader entry by ID)

Parameters and body content

Parameters Body content

Reader_ID None

Responses

code description

204 Successful operation

404 Entry not found

Book

POST /books (creates a new book entry)

Parameters and body content

Parameters Body content. Required.

None Title [STRING], ISBN [INT], Author_ID [INT], Genre_ID [INT], Reader_ID [INT]

Responses

code description

201 Successful operation

400 Content element empty, null or not unique

GET /books (returns all book entries)

Parameters and body content

Parameters Body content

None None

Responses

code description

200 Successful operation

404 Entry not found

GET /books/:id (returns a book entry by ID)

Parameters and body content

Parameters Body content

Book_ID None

Responses

code description

200 Successful operation

404 Entry not found

PATCH /books/:id (updates a book entry by ID)

Parameters and body content

Parameters Body content

Book_ID Title [STRING], ISBN [STRING], Author_ID [INT], Genre_ID [INT] and/or Reader_ID [INT]

Responses

code description

200 Successful operation

404 Entry not found

DELETE /books/:id (deletes a book entry by ID)

Parameters and body content

Parameters Body content

Book_ID None

Responses

code description

204 Successful operation

404 Entry not found

Author

POST /authors (creates a new author entry)

Parameters and body content

Parameters Body content

None Name [STRING]

Responses

code description

201 Successful operation

400 Content element empty, null or not unique

GET /authors (returns all the author entries)

Parameters and body content

Parameters Body content

None None

Responses

code description

200 Successful operation

404 Entry not found

GET /authors/:id (returns an author entry by ID)

Parameters and body content

Parameters Body content

Author_ID None

Responses

code description

200 Successful operation

404 Entry not found

PATCH /authors/:id (updates an author entry by ID)

Parameters and body content

Parameters Body content

Author_ID Name [STRING]

Responses

code description

200 Successful operation

404 Entry not found

DELETE /authors/:id (deletes an author entry by ID)

Parameters and body content

Parameters Body content

Author_ID None

Responses

code description

204 Successful operation

404 Entry not found

Genre

POST /genres (creates a new genre entry)

Parameters and body content

Parameters Body content

None Genre[STRING]

Responses

code description

201 Successful operation

400 Content element empty, null or not unique

GET /genres (returns all the genre entries)

Parameters and body content

Parameters Body content

None None

Responses

code description

200 Successful operation

404 Genres not found

GET /genres/:id (returns a genre entry by ID)

Parameters and body content

Parameters Body content

Genre_ID None

Responses

code description

200 Successful operation

404 Entry not found

PATCH /genres/:id (updates a genre entry by ID)

Parameters and body content

Parameters Body content

Genre_ID Genre [STRING]

Responses

code description

200 Successful operation

404 Entry not found

DELETE /genres/:id (deletes a genre entry by ID)

Parameters and body content

Parameters Body content

Genre_ID None

Responses

code description

204 Successful operation

404 Entry not found

Tests

I have been using Mocha, Chai and Supertest to write test suites trying the functionality of the API. This is the result for the current version when running npm test:

Test Results


/authors
    with no records in the database
      POST /authors
        ✔ creates a new author in the database (770ms)
        ✔ errors if name is null
    with records in the database
      GET /authors
        ✔ gets all authors records
      GET /authors/:id
        ✔ gets authors record by id
        ✔ returns a 404 if the author does not exist
      PATCH /authors/:id
        ✔ updates authors name by id
        ✔ returns a 404 if the author does not exist
      DELETE /authors/:id
        ✔ deletes author record by id
        ✔ returns a 404 if the author does not exist


  /books
    with no records in the database
      POST /books
        ✔ creates a new book in the database
        ✔ errors if title is null
    with records in the database
      GET /books
        ✔ gets all books records
      GET /books/:id
        ✔ gets books record by id
        ✔ returns a 404 if the book does not exist
      PATCH /books/:id
        ✔ updates books title by id
        ✔ returns a 404 if the book does not exist
      DELETE /books/:id
        ✔ deletes book record by id
        ✔ returns a 404 if the book does not exist


  /genres
    with no records in the database
      POST /genres
        ✔ creates a new genre in the database
        ✔ errors if genre is null
    with records in the database
      GET /genres
        ✔ gets all genres records
      GET /genres/:id
        ✔ gets genres record by id
        ✔ returns a 404 if the genre does not exist
      PATCH /genres/:id
        ✔ updates genres genre by id
        ✔ returns a 404 if the genre does not exist
      DELETE /genres/:id
        ✔ deletes genre record by id
        ✔ returns a 404 if the author does not exist


  /readers
    with no records in the database
      POST /readers
        ✔ creates a new reader in the database
        ✔ errors if email format not valid
        ✔ errors if any fields are missing
        ✔ errors password is less than 8 char length
    with records in the database
      GET /readers
        ✔ gets all readers records
      GET /readers/:id
        ✔ gets readers record by id
        ✔ returns a 404 if the reader does not exist
      PATCH /readers/:id
        ✔ updates readers email by id
        ✔ returns a 404 if the reader does not exist
      DELETE /readers/:id
        ✔ deletes reader record by id
        ✔ returns a 404 if the reader does not exist

38 passing (3s)

Name		Name	Last commit message	Last commit date
Latest commit History 19 Commits
scripts		scripts
src		src
tests		tests
.gitignore		.gitignore
ERD.jpeg		ERD.jpeg
README.md		README.md
index.js		index.js
package-lock.json		package-lock.json
package.json		package.json

code	description
`201`	Successful operation
`400`	Content element empty, null, not unique, not the right format or not the right length

C-Marfil/book_exchange

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Book Exchange App 📚♻️📚

Objectives

Planning the project

Current Version

Set Up

API Endpoints

Reader

Parameters and body content

Responses

Parameters and body content

Responses

Parameters and body content

Responses

Parameters and body content

Responses

Parameters and body content

Responses

Book

Parameters and body content

Responses

Parameters and body content

Responses

Parameters and body content

Responses

Parameters and body content

Responses

Parameters and body content

Responses

Author

Parameters and body content

Responses

Parameters and body content

Responses

Parameters and body content

Responses

Parameters and body content

Responses

Parameters and body content

Responses

Genre

Parameters and body content

Responses

Parameters and body content

Responses

Parameters and body content

Responses

Parameters and body content

Responses

Parameters and body content

Responses

Tests

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