This project demonstrates a Golang application utilizing GORM for ORM and implementing tests for the functionalities.

GORM is a powerful ORM library for Go, designed to simplify database operations and streamline development workflows. This project demonstrates various GORM features and best practices through a simple yet comprehensive example application.

The project consists of the following files:

• db.go: Contains the implementation of the database connection using the singleton design pattern.
• main.go: Defines the main functionalities of the application.
• main_test.go: Contains test cases for the implemented functionalities.
• go.mod and go.sum: Files generated by Go modules to manage dependencies.

The project connects to a PostgreSQL database. Modify the connection parameters (user, password, host, port, dbname) in db.go according to your PostgreSQL setup.

• GetConnection(): Establishes a connection to the database using the singleton pattern.
• RefreshDatabase(): Refreshes the database by dropping existing tables and recreating them.
• SeedUser(): Seeds the database with user data, including calendars and appointments.
• UserWithRangeAppointmentScope(): Defines a scope to retrieve users with appointments within a specified date range and calendar name.
• UpdateAppointment(): Updates appointment start time and description based on calendar name and keyword.

• TestDatabaseConnectionAndAutoMigrate(): Tests the database connection and auto-migration of tables.
• TestUserTable(), TestCalendarTable(), TestAppointmentTable(), TestTaskListTable(): Tests the structure of each database table.
• TestUserCalendarRelationship(), TestCalendarAppointmentRelationship(), TestTaskListAppointmentRelationship(), TestUserAppointmentRelationship(): Tests the relationships between database tables.
• TestRefreshDatabase(): Tests the refresh database functionality.
• TestSeedUser(): Tests the seed user functionality.
• TestUserWithRangeAppointmentScope(): Tests the user appointment scope functionality.
• TestUpdateAppointment(): Tests the update appointment functionality.

• Each user has a calendar, and each calendar belongs to a user.
• Each user can have several appointments, and each appointment can have several users (through the appointment_user table).
• Each calendar can have several appointments.
• Each task list can have several appointments.
• Whenever an appointment belongs to a calendar or task list.

1. Clone the repository: git clone <repository-url>
2. Navigate to the project directory: cd <project-directory>
3. Modify the database connection parameters in db.go if necessary.
4. Run the tests: go test -v

• Go 1.16 or higher
• PostgreSQL database

This project was inspired by the need for a practical guide to working with GORM in Golang. it's a good starting point for learning about GORM and getting familiar with its features.