FIX: newly created categories were not showing up

app/assets/javascripts/discourse/models/category.js.es6

@@ -286,6 +286,10 @@ Category.reopenClass({
     return Discourse.ajax(`/c/${id}/show.json`);
   },
 
+  reloadBySlug(slug, parentSlug) {
+    return parentSlug ? Discourse.ajax(`/c/${parentSlug}/${slug}/find_by_slug.json`) : Discourse.ajax(`/c/${slug}/find_by_slug.json`);
+  },
+
   search(term, opts) {
     var limit = 5;
 

app/assets/javascripts/discourse/routes/build-category-route.js.es6

@@ -2,6 +2,8 @@ import { filterQueryParams, findTopicList } from 'discourse/routes/build-topic-r
 import { queryParams } from 'discourse/controllers/discovery-sortable';
 import TopicList from 'discourse/models/topic-list';
 import PermissionType from 'discourse/models/permission-type';
+import CategoryList from 'discourse/models/category-list';
+import Category from 'discourse/models/category';
 
 // A helper function to create a category route with parameters
 export default (filter, params) => {
@@ -9,7 +11,19 @@ export default (filter, params) => {
     queryParams,
 
     model(modelParams) {
-      return { category: Discourse.Category.findBySlug(modelParams.slug, modelParams.parentSlug) };
+      const category = Category.findBySlug(modelParams.slug, modelParams.parentSlug);
+      if (!category) {
+        return Category.reloadBySlug(modelParams.slug, modelParams.parentSlug).then((atts) => {
+          if (modelParams.parentSlug) {
+            atts.category.parentCategory = Category.findBySlug(modelParams.parentSlug);
+          }
+          const record = this.store.createRecord('category', atts.category);
+          record.setupGroupsAndPermissions();
+          this.site.updateCategory(record);
+          return { category: Category.findBySlug(modelParams.slug, modelParams.parentSlug) };
+        })
+      };
+      return { category };
     },
 
     afterModel(model, transition) {
@@ -38,7 +52,6 @@ export default (filter, params) => {
     _createSubcategoryList(category) {
       this._categoryList = null;
       if (Em.isNone(category.get('parentCategory')) && Discourse.SiteSettings.show_subcategory_list) {
-        const CategoryList = require('discourse/models/category-list').default;
         return CategoryList.listForParent(this.store, category).then(list => this._categoryList = list);
       }
 

app/controllers/categories_controller.rb

@@ -2,7 +2,7 @@ require_dependency 'category_serializer'
 
 class CategoriesController < ApplicationController
 
-  before_filter :ensure_logged_in, except: [:index, :show, :redirect]
+  before_filter :ensure_logged_in, except: [:index, :show, :redirect, :find_by_slug]
   before_filter :fetch_category, only: [:show, :update, :destroy]
   before_filter :initialize_staff_action_logger, only: [:create, :update, :destroy]
   skip_before_filter :check_xhr, only: [:index, :redirect]
@@ -153,6 +153,15 @@ class CategoriesController < ApplicationController
     render json: success_json
   end
 
+  def find_by_slug
+    params.require(:category_slug)
+    @category = Category.find_by_slug(params[:category_slug], params[:parent_category_slug])
+    guardian.ensure_can_see!(@category)
+
+    @category.permission = CategoryGroup.permission_types[:full] if Category.topic_create_allowed(guardian).where(id: @category.id).exists?
+    render_serialized(@category, CategorySerializer)
+  end
+
   private
 
     def required_param_keys

app/models/category.rb

@@ -450,6 +450,15 @@ SQL
   def publish_discourse_stylesheet
     DiscourseStylesheets.cache.clear
   end
+
+  def self.find_by_slug(category_slug, parent_category_slug=nil)
+    if parent_category_slug
+      parent_category_id = self.where(slug: parent_category_slug, parent_category_id: nil).pluck(:id).first
+      self.where(slug: category_slug, parent_category_id: parent_category_id).first
+    else
+      self.where(slug: category_slug, parent_category_id: nil).first
+    end
+  end
 end
 
 # == Schema Information

config/routes.rb

@@ -430,6 +430,8 @@ Discourse::Application.routes.draw do
   put "category/:category_id/slug" => "categories#update_slug"
 
   get "c/:id/show" => "categories#show"
+  get "c/:category_slug/find_by_slug" => "categories#find_by_slug"
+  get "c/:parent_category_slug/:category_slug/find_by_slug" => "categories#find_by_slug"
   get "c/:category.rss" => "list#category_feed", format: :rss
   get "c/:parent_category/:category.rss" => "list#category_feed", format: :rss
   get "c/:category" => "list#category_latest"

spec/models/category_spec.rb

@@ -583,4 +583,14 @@ describe Category do
     end
   end
 
+  describe "find_by_slug" do
+    it "finds with category and sub category" do
+      category = Fabricate(:category, slug: 'awesome-category')
+      sub_category = Fabricate(:category, parent_category_id: category.id, slug: 'awesome-sub-category')
+
+      expect(Category.find_by_slug('awesome-category')).to eq(category)
+      expect(Category.find_by_slug('awesome-sub-category', 'awesome-category')).to eq(sub_category)
+    end
+  end
+
 end