FEATURE: serialize and update category custom_fields

- send to client
- update from client

app/assets/javascripts/discourse/models/category.js

@@ -75,7 +75,8 @@ Discourse.Category = Discourse.Model.extend({
         parent_category_id: this.get('parent_category_id'),
         logo_url: this.get('logo_url'),
         background_url: this.get('background_url'),
-        allow_badges: this.get('allow_badges')
+        allow_badges: this.get('allow_badges'),
+        custom_fields: this.get('custom_fields')
       },
       type: this.get('id') ? 'PUT' : 'POST'
     });

app/controllers/categories_controller.rb

@@ -146,6 +146,7 @@ class CategoriesController < ApplicationController
                         :background_url,
                         :allow_badges,
                         :slug,
+                        :custom_fields => [params[:custom_fields].try(:keys)],
                         :permissions => [*p.try(:keys)])
       end
     end

app/serializers/category_serializer.rb

@@ -10,7 +10,8 @@ class CategorySerializer < BasicCategorySerializer
              :email_in_allow_strangers,
              :can_delete,
              :cannot_delete_reason,
-             :allow_badges
+             :allow_badges,
+             :custom_fields
 
   def group_permissions
     @group_permissions ||= begin

spec/controllers/categories_controller_spec.rb

@@ -162,8 +162,12 @@ describe CategoriesController do
                               permissions: {
                                 "everyone" => readonly,
                                 "staff" => create_post
+                              },
+                              custom_fields: {
+                                "dancing" => "frogs"
                               }
 
+
           expect(response.status).to eq(200)
           @category.reload
           expect(@category.category_groups.map{|g| [g.group_id, g.permission_type]}.sort).to eq([
@@ -173,6 +177,7 @@ describe CategoriesController do
           expect(@category.slug).to eq("hello-category")
           expect(@category.color).to eq("ff0")
           expect(@category.auto_close_hours).to eq(72)
+          expect(@category.custom_fields).to eq({"dancing" => "frogs"})
         end
       end
     end