func List(c *gin.Context) {
context := appengine.NewContext(c.Request)
greetings := models.Greetings{}
if err := db.NewDatastore(context).Query(greetings.GetAll()).All(&greetings); err != nil {
statusInternalServerError(c, err)
} else {
c.JSON(http.StatusOK, greetings)
}
}