FEATURE: Render Topics from Selected Categories/Tags on `/knowledge-explorer`

Add category/tag settings

Rename to knowledge explorer

Missed rename

Render a deduplicated list of topics from all selected tags and categories

Exclude category topic ids from rendered list

app/controllers/knowledge_explorer/knowledge_explorer_controller.rb

@@ -0,0 +1,64 @@
+module KnowledgeExplorer
+  class KnowledgeExplorerController< ApplicationController
+    skip_before_action :check_xhr
+    before_action :init_guardian
+
+    def index
+      category_topic_lists = []
+      tag_topic_lists = []
+
+      knowledge_explorer_categories.each do |c|
+        if topic_list = TopicQuery.new(current_user, category: c.id).list_latest
+          category_topic_lists << TopicListSerializer.new(topic_list, scope: @guardian).as_json
+        end
+      end
+
+      knowledge_explorer_tags.each do |t|
+        if topic_list = TopicQuery.new(current_user, tags: t.name).list_latest
+          tag_topic_lists << TopicListSerializer.new(topic_list, scope: @guardian).as_json
+        end
+      end
+
+      topics = []
+
+      category_topic_lists.each do |list|
+        list[:topic_list][:topics].each do |t| 
+          if !topics.any?{|item| item[:id] == t[:id]}
+            if t[:id] != Category.find(t[:category_id]).topic_id
+              topics << t
+            end
+          end
+        end
+      end
+      tag_topic_lists.each do |list|
+        list[:topic_list][:topics].each do |t| 
+          if !topics.any?{|item| item[:id] == t[:id]}
+            topics << t
+          end
+        end
+      end
+
+      render json: topics
+    end
+
+    private
+
+    def init_guardian
+      @guardian = Guardian.new(current_user)
+    end
+    
+    def knowledge_explorer_categories
+      selected_categories = SiteSetting.knowledge_explorer_categories.split("|")
+
+      categories = Category.where('slug IN (?)', selected_categories)
+
+      categories.select { |c| @guardian.can_see_category?(c) }
+    end
+
+    def knowledge_explorer_tags
+      selected_tags = SiteSetting.knowledge_explorer_tags.split("|")
+
+      tags = Tag.where('name IN (?)', selected_tags)
+    end
+  end
+end

config/locales/server.en.yml

@@ -1,3 +1,5 @@
 en:
   site_settings:
-    knowledge_base_enabled: "Enable the Knowledge Base Plugin"
+    knowledge_explorer_enabled: "Enable the Knowledge Explorer Plugin"
+    knowledge_explorer_categories: "A list of category slugs to include in the knowledge explorer"
+    knowledge_explorer_tags: "A list of tags to include in the knowledge explorer"

config/routes.rb

@@ -0,0 +1,5 @@
+require_dependency "knowledge_explorer_constraint"
+
+KnowledgeExplorer::Engine.routes.draw do
+  get "/" => "knowledge_explorer#index", constraints: KnowledgeExplorerConstraint.new
+end

config/settings.yml

@@ -1,4 +1,12 @@
 plugins:
-  knowledge_base_enabled:
+  knowledge_explorer_enabled:
     default: false
     client: true
+  knowledge_explorer_categories:
+    type: list
+    default: ""
+    client: true
+  knowledge_explorer_tags:
+    type: list
+    default: ""
+    client: true

lib/knowledge_explorer/engine.rb

@@ -0,0 +1,11 @@
+module ::KnowledgeExplorer
+  class Engine < ::Rails::Engine
+    isolate_namespace KnowledgeExplorer
+
+    config.after_initialize do
+      Discourse::Application.routes.append do
+        mount ::KnowledgeExplorer::Engine, at: "/knowledge-explorer"
+      end
+    end
+  end
+end

lib/knowledge_explorer_constraint.rb

@@ -0,0 +1,5 @@
+class KnowledgeExplorerConstraint
+  def matches?(request)
+    SiteSetting.knowledge_explorer_enabled
+  end
+end

plugin.rb

@@ -1,8 +1,10 @@
-# name: discourse-knowledge-base
-# about: A plugin to make it easy to find knowledge base articles in Discourse
+# name: discourse-knowledge-explorer
+# about: A plugin to make it easy to explore and find knowledge base-type articles in Discourse
 # version: 0.1
 # author: Justin DiRose
 # license: 
 # url: 
 
-enabled_site_setting :knowledge_base_enabled
+enabled_site_setting :knowledge_explorer_enabled
+
+load File.expand_path('../lib/knowledge_explorer/engine.rb', __FILE__)