docs: update many-to-many-relations.md, make it easier to understand (typeorm#4680)

QoVoQ · pleerock · commit 5bd29d58c342 · 2019-09-05T17:27:30.000+05:00
* Update many-to-many-relations.md

Make the example of the last section `many-to-many relations with custom properties` more clear and general.

* Update many-to-many-relations.md
diff --git a/docs/many-to-many-relations.md b/docs/many-to-many-relations.md
@@ -186,7 +186,10 @@ export class PostToCategory {
     @PrimaryGeneratedColumn()
     public postToCategoryId!: number;
 
+    @Column()
     public postId!: number;
+    
+    @Column()
     public categoryId!: number;
 
     @Column()
@@ -203,6 +206,13 @@ export class PostToCategory {
 Additionally you will have to add a relationship like the following to `Post` and `Category`:
 
 ```typescript
+// category.ts
+...
+@OneToMany((type) => PostToCategory, (postToCategory) => postToCategory.category)
+public postToCategories!: PostToCategory[];
+
+// post.ts
+...
 @OneToMany((type) => PostToCategory, (postToCategory) => postToCategory.post)
 public postToCategories!: PostToCategory[];
 ```
