implemented file upload for attachments

src/model/Post.ts

@@ -5,6 +5,7 @@ import { Attribute, AutoIncrement, BelongsTo, BelongsToMany, CreatedAt, Default,
 import { Tag } from "./Tag";
 import { PostTag } from "./PostTag";
 import { Project } from "./Project";
+import { Attachment } from "./Attachment";
 
 export class Post extends Model<InferAttributes<Post>, InferCreationAttributes<Post>> {
     
@@ -45,6 +46,10 @@ export class Post extends Model<InferAttributes<Post>, InferCreationAttributes<P
 
     @BelongsToMany(()=>Tag, { through: { model: ()=>PostTag, unique: false}, inverse: {as: 'taggedPosts'} })
     declare postTags?:NonAttribute<Tag[]>;
+
+    /** Defined by {@link Attachment.post} */
+    declare Attachments:NonAttribute<Attachment>[];
+
     
     declare getUser: BelongsToGetAssociationMixin<User>;