main-program.go

//Create New POST
post := &Post{Name: "Post2"}
	if db.Create(&post).Error != nil {
		log.Panic("Unable to create post")
	}


//RELATION QUERY (POST & COMMENT)
comment := &Comment{Name: "Nice Post", PostID: post.ID}
if db.Create(&comment).Error != nil {
		log.Panic("Unable to create comment")
	}

//WHERE
fetchedPost := &Post{}
if err := db.Where("id = ?", comment.PostID).Preload("Comment").First(&fetchedPost).Error; err != nil {
		log.Panic("Unable to find created Post.")
}