Use db for queue (#498)

internal/db/gist_init_queue.go

@@ -0,0 +1,34 @@
+package db
+
+type GistInitQueue struct {
+	GistID uint `gorm:"primaryKey"`
+	Gist   Gist `gorm:"constraint:OnUpdate:CASCADE,OnDelete:CASCADE;foreignKey:GistID"`
+	UserID uint `gorm:"primaryKey"`
+	User   User `gorm:"constraint:OnUpdate:CASCADE,OnDelete:CASCADE;foreignKey:UserID"`
+}
+
+func GetInitGistInQueueForUser(userID uint) (*Gist, error) {
+	queue := new(GistInitQueue)
+	err := db.Preload("Gist").Preload("Gist.User").
+		Where("user_id = ?", userID).
+		Order("gist_id asc").
+		First(&queue).Error
+	if err != nil {
+		return nil, err
+	}
+
+	err = db.Delete(&queue).Error
+	if err != nil {
+		return nil, err
+	}
+
+	return &queue.Gist, nil
+}
+
+func AddInitGistToQueue(gistID uint, userID uint) error {
+	queue := &GistInitQueue{
+		GistID: gistID,
+		UserID: userID,
+	}
+	return db.Create(&queue).Error
+}