internal/postgres/tag.go

@@ -13,11 +13,11 @@ import (
 func CreateTag(ctx context.Context, db *gorm.DB, tagName models.AnthroveTagName, tagType models.TagType) error {
 
 	if tagName == "" {
-		return &otterError.EntityValidationFailed{Reason: "tagName is empty"}
+		return &otterError.EntityValidationFailed{Reason: "tagName cannot be empty"}
 	}
 
 	if tagType == "" {
-		return &otterError.EntityValidationFailed{Reason: "tagType is empty"}
+		return &otterError.EntityValidationFailed{Reason: "tagType cannot be empty"}
 	}
 
 	result := db.WithContext(ctx).Create(&models.Tag{Name: string(tagName), Type: tagType})
@@ -40,6 +40,28 @@ func CreateTag(ctx context.Context, db *gorm.DB, tagName models.AnthroveTagName,
 	return nil
 }
 
+func DeleteTag(ctx context.Context, db *gorm.DB, tagName models.AnthroveTagName) error {
+
+	if tagName == "" {
+		return &otterError.EntityValidationFailed{Reason: "tagName cannot be empty"}
+	}
+
+	result := db.WithContext(ctx).Delete(&models.Tag{Name: string(tagName)})
+
+	if result.Error != nil {
+		if errors.Is(result.Error, gorm.ErrRecordNotFound) {
+			return &otterError.NoDataFound{}
+		}
+		return result.Error
+	}
+
+	log.WithFields(log.Fields{
+		"tag_name": tagName,
+	}).Trace("database: deleted tag")
+
+	return nil
+}
+
 func CreateTagAndReferenceToPost(ctx context.Context, db *gorm.DB, anthrovePostID models.AnthrovePostID, tag *models.Tag) error {
 
 	if anthrovePostID == "" {

internal/postgres/tag_test.go

@@ -949,3 +949,73 @@ func TestDeleteTagGroup(t *testing.T) {
 		})
 	}
 }
+
+func TestDeleteTag(t *testing.T) {
+	// Setup trow away container
+	ctx := context.Background()
+	container, gormDB, err := test.StartPostgresContainer(ctx)
+	if err != nil {
+		t.Fatalf("Could not start PostgreSQL container: %v", err)
+	}
+	defer container.Terminate(ctx)
+
+	// Setup Test
+	validTagID := models.AnthroveTagID("toothless")
+
+	validTag := &models.Tag{
+		Name: string(validTagID),
+		Type: models.Character,
+	}
+
+	err = CreateTag(ctx, gormDB, models.AnthroveTagName(validTag.Name), validTag.Type)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// Test
+	type args struct {
+		ctx     context.Context
+		db      *gorm.DB
+		tagName models.AnthroveTagName
+	}
+	tests := []struct {
+		name    string
+		args    args
+		wantErr bool
+	}{
+		{
+			name: "Test 1: Valid TagName",
+			args: args{
+				ctx:     ctx,
+				db:      gormDB,
+				tagName: models.AnthroveTagName(validTagID),
+			},
+			wantErr: false,
+		},
+		{
+			name: "Test 2: Invalid TagName",
+			args: args{
+				ctx:     ctx,
+				db:      gormDB,
+				tagName: models.AnthroveTagName("aaa"),
+			},
+			wantErr: false,
+		},
+		{
+			name: "Test 3: No TagName",
+			args: args{
+				ctx:     ctx,
+				db:      gormDB,
+				tagName: "",
+			},
+			wantErr: true,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			if err := DeleteTag(tt.args.ctx, tt.args.db, tt.args.tagName); (err != nil) != tt.wantErr {
+				t.Errorf("DeleteTag() error = %v, wantErr %v", err, tt.wantErr)
+			}
+		})
+	}
+}

pkg/database/postgres.go

@@ -212,8 +212,7 @@ func (p *postgresqlConnection) GetAllTagByTagType(ctx context.Context, tagType m
 }
 
 func (p *postgresqlConnection) DeleteTag(ctx context.Context, tagName models.AnthroveTagName) error {
-	//TODO implement me
+	return postgres.DeleteTag(ctx, p.db, tagName)
-	panic("implement me")
 }
 
 // HELPER

pkg/database/postgres_test.go

@@ -3073,3 +3073,73 @@ func Test_postgresqlConnection_UpdateUserSourceValidation(t *testing.T) {
 		})
 	}
 }
+
+func Test_postgresqlConnection_DeleteTag(t *testing.T) {
+	// Setup trow away container
+	ctx := context.Background()
+	container, gormDB, err := test.StartPostgresContainer(ctx)
+	if err != nil {
+		t.Fatalf("Could not start PostgreSQL container: %v", err)
+	}
+	defer container.Terminate(ctx)
+
+	// Setup Test
+	validTagID := models.AnthroveTagID("toothless")
+
+	validTag := &models.Tag{
+		Name: string(validTagID),
+		Type: models.Character,
+	}
+
+	err = postgres.CreateTag(ctx, gormDB, models.AnthroveTagName(validTag.Name), validTag.Type)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// Test
+	type args struct {
+		ctx     context.Context
+		tagName models.AnthroveTagName
+	}
+	tests := []struct {
+		name    string
+		args    args
+		wantErr bool
+	}{
+		{
+			name: "Test 1: Valid TagName",
+			args: args{
+				ctx:     ctx,
+				tagName: models.AnthroveTagName(validTagID),
+			},
+			wantErr: false,
+		},
+		{
+			name: "Test 2: Invalid TagName",
+			args: args{
+				ctx:     ctx,
+				tagName: models.AnthroveTagName("aaa"),
+			},
+			wantErr: false,
+		},
+		{
+			name: "Test 3: No TagName",
+			args: args{
+				ctx:     ctx,
+				tagName: "",
+			},
+			wantErr: true,
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			p := &postgresqlConnection{
+				db:    gormDB,
+				debug: true,
+			}
+			if err := p.DeleteTag(tt.args.ctx, tt.args.tagName); (err != nil) != tt.wantErr {
+				t.Errorf("DeleteTag() error = %v, wantErr %v", err, tt.wantErr)
+			}
+		})
+	}
+}