Web Development with Golang and Beego/

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Notes Display

Notes Display

Learn to create an API to read and render a note from the database.

We'll cover the following...

Reading a note

In this lesson, we are going to implement a route/API that shows the details of a note.

Let’s start by defining a new route in the routers/route.go file.

Go (1.18.2)
package routers
import (
	"beego_notes/controllers"
	beego "github.com/beego/beego/v2/server/web"
)
func init() {
	beego.Router("/", &controllers.MainController{})
	beego.Router("/notes", &controllers.NotesController{}, "get:NotesIndex")
	beego.Router("/notes/new", &controllers.NotesController{}, "get:NotesNewForm")
	beego.Router("/notes", &controllers.NotesController{}, "post:NotesCreate")
	beego.Router("/notes/:id([0-9]+)", &controllers.NotesController{}, "get:NotesShow")
}

Line 14: The route with the pattern /notes/:id([0-9]+) uses the GET method to trigger the NotesShow() action, where :id is a placeholder for the note’s numerical Id. Therefore, requesting /notes/1 would fetch and render the note with Id 1 from the database.

Handler function

Go (1.18.2)
package controllers
import (
	"beego_notes/models"
	"fmt"
	"net/http"
	"strconv"
	beego "github.com/beego/beego/v2/server/web"
)
// NotesController operations for Notes
type NotesController struct {
	beego.Controller
}
func (c *NotesController) NotesIndex() {
	// Get all notes
	notes := models.NotesGetAll()
	c.Data["notes"] = notes
	c.TplName = "notes/index.tpl"
}
func (c *NotesController) NotesNewForm() {
	c.TplName = "notes/new.tpl"
}
func (c *NotesController) NotesCreate() {
	name := c.GetString("name")
	content := c.GetString("content")
	models.NotesCreate(name, content)
	c.Redirect("/notes", http.StatusFound)
}
func (c *NotesController) NotesShow() {
	idStr := c.Ctx.Input.Param(":id")
	id, err := strconv.ParseUint(idStr, 10, 64)
	if err != nil {
		fmt.Printf("Error: %v", err)
	}
	note := models.NotesFind(id)
	c.Data["note"] = note
	c.TplName = "notes/show.tpl"
}

The NotesShow() function is responsible for showing a note. Details of the function are as follows: ...