update posts and postCategories slug/relation

public/admin/config.yml

@@ -65,7 +65,7 @@ collections: # A list of collections the CMS should be able to edit
     editor:
       preview: false
     folder: content/posts
-    slug: "{{slug}}"
+    slug: "{{year}}-{{month}}-{{day}}-{{slug}}"
     create: true # Allow users to create new documents in this collection
     fields: # The fields each document in this collection have
       - {label: Title, name: title, widget: string}
@@ -83,7 +83,7 @@ collections: # A list of collections the CMS should be able to edit
             widget: "relation"
             collection: "postCategories"
             searchFields: ["title"]
-            valueField: "title"
+            valueField: "name"
       - {label: Date / Order, name: date, widget: date}
       - {label: Post Featured Image, name: postFeaturedImage, widget: image, required: false}
       - {label: Excerpt, name: excerpt, widget: text}

src/App.js

@@ -74,7 +74,7 @@ class App extends Component {
     )
     const categoriesFromPosts = getCollectionTerms(posts, 'categories')
     const postCategories = this.getDocuments('postCategories').filter(
-      category => categoriesFromPosts.indexOf(category.title.toLowerCase()) >= 0
+      category => categoriesFromPosts.indexOf(category.name.toLowerCase()) >= 0
     )
 
     return (