added a controller to manage controller's errors

controllers/error_handler.go

@@ -0,0 +1,21 @@
+package controllers
+
+import (
+	"fmt"
+
+	beego "github.com/beego/beego/v2/server/web"
+)
+
+func HandleControllerErrors(c beego.Controller, code int, err *error, data *map[string]interface{}, messages ...string) {
+	for _, mess := range messages {
+		fmt.Println(mess)
+	}
+	if data != nil {
+		c.Data["json"] = data
+	}
+	if err != nil {
+		c.Data["json"] = map[string]string{"error": (*err).Error()}
+	}
+	c.Ctx.Output.SetStatus(code)
+	c.ServeJSON()
+}