Moved away from local files to complete database driven articles

database/tag.go

@@ -0,0 +1,54 @@
+package database
+
+import (
+	"gorm.io/gorm/clause"
+	"strings"
+)
+
+type Tag struct {
+	ID   int
+	Name string
+}
+
+func ArticleTagsFromTagSlice(article Article, tags []Tag) (tagsTable []ArticleTags) {
+	for _, tag := range tags {
+		tagsTable = append(tagsTable, ArticleTags{
+			ArticleID: article.ID,
+			TagID:     tag.ID,
+		})
+	}
+	return
+}
+
+type ArticleTags struct {
+	ArticleID int
+	TagID     int
+}
+
+func (db *Database) AddOrGetTags(names []string) (tags []Tag, err error) {
+	for i, name := range names {
+		names[i] = strings.ToLower(name)
+	}
+
+	err = db.gormDB.Table("tag").Clauses(clause.OnConflict{
+		Columns:   []clause.Column{{Name: "name"}},
+		DoNothing: true,
+	}).Select("name").Create(&names).Error
+	if err != nil {
+		return nil, err
+	}
+
+	err = db.gormDB.Table("tag").Find(&tags).Where("name in (?)", &names).Error
+	return
+}
+
+func (db *Database) SetTags(article Article, tags []Tag) error {
+	return db.gormDB.Table("tags").Clauses(clause.OnConflict{
+		Columns:   []clause.Column{{Name: "article_id"}, {Name: "tag_id"}},
+		DoNothing: true,
+	}).Create(ArticleTagsFromTagSlice(article, tags)).Error
+}
+
+func (db *Database) RemoveTags(article Article, tags []Tag) error {
+	return db.gormDB.Table("tags").Delete(ArticleTagsFromTagSlice(article, tags)).Error
+}