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A SQL pagination library for golang with GORM.

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pageboy
==========
[![CircleCI](https://circleci.com/gh/soranoba/pageboy.svg?style=svg&circle-token=977b6c270d30867fe12a0e65d34f8adbb3d7d7f2)](https://circleci.com/gh/soranoba/pageboy)
[![Go Report Card](https://goreportcard.com/badge/github.com/soranoba/pageboy)](https://goreportcard.com/report/github.com/soranoba/pageboy)
[![PkgGoDev](https://pkg.go.dev/badge/github.com/soranoba/pageboy/v4)](https://pkg.go.dev/github.com/soranoba/pageboy/v4)

`pageboy` is a pagination library with [GORM v2](https://github.com/go-gorm/gorm).

## Overviews

- 💪　Support both of before/after (Cursor) and page/per (Pager) DB pagination.
- 🤗　Accept human readable queries.
  - Like them: `?page=1&per_page=2` and `?before=1585706584&limit=10`
  - We can also customize it if needed.
- 💖　We can write smart code using GORM scopes.
- 👌　Supports all DB engine officialy supported by GORM.
  - MySQL, PostgreSQL, SQLite, SQL Server

## Installation

To install it, run:

```bash
go get -u github.com/soranoba/pageboy/v4
```

## Usage

### Cursor

Cursor can be used to indicate a range that is after or before that value. 
It can sort using by time or integer. 
For example, when we sort using CreatedAt and ID, it can prevent duplicate values from occurring.

#### Query Formats

- Simple numbers
  - `https://example.com/api/users?before=1&limit=10`
- Unix Timestamp in seconds
  - `https://example.com/api/users?before=1585706584&limit=10`
- Unix Timestamp in milliseconds (Depends on settings on your database)
  - `https://example.com/api/users?before=1585706584.25&limit=10`
- Unix Timestamp and Sub-Element (e.g. ID)
  - `https://example.com/api/users?before=1585706584.25_20&limit=10`

#### Index Settings

You should create an index when using a Cursor. 
Example using CreatedAt and ID for sorting:

```sql
CREATE INDEX created_at_id ON users (created_at DESC, id DESC);
```

#### Usage in Codes

```go
db, _ := gorm.Open(sqlite.Open("test.db"), &gorm.Config{})
// Please execute it only once immediately after opening DB.
pageboy.RegisterCallbacks(db)
```

```go
type UsersRequest struct {
	pageboy.Cursor
}

func getUsers(ctx echo.Context) error {
	// Set to Default Limit
	req := &UsersRequest{Cursor: pageboy.Cursor{Limit: 10}}
	// Read from query or body
	if err := ctx.Bind(req); err != nil {
		return err
	}
	// Validation
	if err := req.Validate(); err != nil {
		return err
	}
	// Read from DB
	var users []*User
	if err := db.Scopes(req.Cursor.Paginate("CreatedAt", "ID").Order("DESC", "DESC").Scope()).Find(&users).Error; err != nil {
		return err
	}
}
```

#### NULLS FIRST / NULLS LAST

PostgresSQL can accept NULLS FIRST or NULLS LAST for index. 
In that case, it can use the index by adding NULLS FIRST or NULLS LAST in Order.

It is not supported other engines because they cannot accept these for index.

```go
cursor.Paginate("CreatedAt", "UpdatedAt").Order("DESC NULLS LAST", "ASC NULLS FIRST").Scope()
```

### Pager

Pager can be used to indicate a range that is specified a page size and a page number.

#### Query Formats

It includes a page which is 1-Based number, and per_page.

- `https://example.com/users?page=1&per_page=10`

#### Usage in Codes

```go
db, _ := gorm.Open(sqlite.Open("test.db"), &gorm.Config{})
// Please execute it only once immediately after opening DB.
pageboy.RegisterCallbacks(db)
```

```go
type UsersRequest struct {
	pageboy.Pager
}

func getUsers(ctx echo.Context) error {
	// Set to Default
	req := &UsersRequest{Pager: pageboy.Pager{Page: 1, PerPage: 10}}
	// Read from query or body
	if err := ctx.Bind(req); err != nil {
		return err
	}
	// Validation
	if err := req.Validate(); err != nil {
		return err
	}
	// Read from DB
	var users []*User
	if err := db.Scopes(req.Pager.Scope()).Order("id ASC").Find(&users).Error; err != nil {
		return err
	}
}
```

### Attentions

This library is only available for the kind of functions that the [Query callback](https://pkg.go.dev/gorm.io/gorm@v1.21.8/callbacks#Query) is executed on. 
That is, it cannot be used with [Row](https://pkg.go.dev/gorm.io/gorm@v1.21.8#DB.Row) or [Scan](https://pkg.go.dev/gorm.io/gorm@v1.21.8#DB.Scan)

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