intrn(database): post tag transformer

database/transformers/post_tag.ts

@@ -0,0 +1,41 @@
+import type { IncludedRelationships } from "%/types/independent"
+
+import PostTag from "%/models/post_tag"
+import Transformer from "%/transformers/base"
+import TagTransformer from "%/transformers/tag"
+import Serializer from "%/transformers/serializer"
+import PostTransformer from "%/transformers/post"
+import type { AttributesObject, TransformerOptions } from "%/types/dependent"
+
+type Relationships = "post"|"tag"
+
+export default class extends Transformer<PostTag, void> {
+	constructor({ included }: IncludedRelationships<Relationships> = {
+		"included": [ "post", "tag" ]
+	}) {
+		super("post_tag", [
+			included.indexOf("post") > -1
+				? {
+					"attribute": "post",
+					"transformer": new PostTransformer()
+				}
+				: null,
+			included.indexOf("tag") > -1
+				? {
+					"attribute": "tag",
+					"transformer": new TagTransformer()
+				}
+				: null
+		])
+	}
+
+
+	transform(model: PostTag|PostTag[], unusedOptions: TransformerOptions)
+	: AttributesObject {
+		const safeObject = Serializer.whitelist(model, [
+			"id"
+		])
+
+		return safeObject
+	}
+}