Add tags in edit endpoint

app/commands/posts/update.rb

@@ -13,7 +13,7 @@ module Adamantium
           end
 
           if params.key? :add
-
+            post_repo.tag_post(post.id, params[:add][:category])
           end
 
           if params.key? :delete

app/repos/post_repo.rb

@@ -27,6 +27,24 @@ module Adamantium
         end
       end
 
+      def tag_post(post_id:, tags:)
+        tags.each do |tag_name|
+          next if tag_name == ""
+
+          tag = post.tags.where(label: tag_name).one ||
+            post
+              .tags
+              .changeset(:create, {label: tag_name, slug: tag_name.downcase.strip.tr(" ", "-").gsub(/[^\w-]/, "")})
+              .commit
+
+          posts.post_tags.changeset(:create, {
+            post_id: post_id,
+            tag_id: tag[:id]
+          })
+            .commit
+        end
+      end
+
       def post_listing(limit: nil)
         posts
           .where(post_type: "post")