REFACTOR: Complete filtering on back end for complexity purposes

app/controllers/knowledge_explorer/knowledge_explorer_controller.rb

@@ -16,11 +16,7 @@ module KnowledgeExplorer
        category_topic_lists = get_topics_from_categories(knowledge_explorer_categories)
       end
 
-      if filters[:tags]
-        tag_topic_lists = get_topics_from_tags(tags_by_filter(filters[:tags]))
-      else
-        tag_topic_lists = get_topics_from_tags(knowledge_explorer_tags)
-      end
+      tag_topic_lists = get_topics_from_tags(knowledge_explorer_tags)
 
       # Deduplicate results
 
@@ -43,6 +39,11 @@ module KnowledgeExplorer
         end
       end
 
+      if filters[:tags]
+        tag_filter = filters[:tags].split(' ')
+        topics = topics.select { |topic| (topic[:tags] & tag_filter).size >= 1}
+      end
+
       topics = count_tags(topics)
 
       render json: topics
@@ -77,8 +78,11 @@ module KnowledgeExplorer
 
       topics.each do |topic|
         topic[:tags].each do |tag| 
+          if params[:tags]
+            active = params[:tags].include?(tag)
+          end
           if tags.none? { |item| item[:id].to_s == tag }
-            tags << { id: tag, count: 1 }
+            tags << { id: tag, count: 1 , active: active || false }
           else
             tag_index = tags.index(tags.find { |item| item[:id].to_s == tag })
             tags[tag_index][:count] += 1
@@ -123,7 +127,9 @@ module KnowledgeExplorer
 
     def tags_by_filter(tags)
       selected_tags = tags.split(' ')
-      Tag.where('name IN (?)', selected_tags)
+      if (selected_tags)
+        return Tag.where('name IN (?)', selected_tags)
+      end
     end
   end
 end

assets/javascripts/discourse/components/knowledge-explorer-search.js.es6

@@ -10,7 +10,11 @@ export default Ember.Component.extend({
     }
 
     // query the search api
-    knowledgeExplorer.search(this.get("filteredTags"), term).then(result => {
+    const tags = this.get("filterTags") || null;
+    if (tags && tags.includes(" ")) {
+      tags.join(" ");
+    }
+    knowledgeExplorer.search(tags, term).then(result => {
       this.set("searchResults", result.topics || []);
     });
   },

assets/javascripts/discourse/controllers/knowledge-explorer.js.es6

@@ -3,26 +3,15 @@ import {
   observes
 } from "ember-addons/ember-computed-decorators";
 
-function arrayContainsArray(superset, subset) {
-  if (0 === subset.length) {
-    return false;
-  }
-  return subset.every(v => superset.indexOf(v) >= 0);
-}
-
 export default Ember.Controller.extend({
   application: Ember.inject.controller(),
   queryParams: {
     filterCategory: "category",
     filterTags: "tags"
   },
-  filtered: false,
   filterTags: null,
   filterCategory: null,
 
-  filteredTags: null,
-  filteredTopics: null,
-
   searchTerm: null,
   searchResults: null,
 
@@ -41,63 +30,8 @@ export default Ember.Controller.extend({
     return results.length;
   },
 
-  @observes("filterTags")
-  filterByTags() {
-    const filterTags = this.get("filterTags");
-    if (filterTags != null) {
-      const filter = filterTags.split(" ");
-      const topics = this.get("topics");
-      const tags = this.get("tags");
-
-      if (filter != "") {
-        const filteredTopics = topics.filter(topic =>
-          arrayContainsArray(topic.tags, filter)
-        );
-
-        const filteredTags = [];
-
-        // add active tags
-        filter.forEach(tag => {
-          let t = {
-            id: tag,
-            count: 0,
-            active: true
-          };
-
-          filteredTags.push(t);
-        });
-
-        filteredTopics.forEach(topic => {
-          let topicTags = topic.tags;
-          topicTags.forEach(tag => {
-            if (filterTags.includes(tag)) {
-              //increment count for active tags
-              let index = filteredTags.findIndex(t => t.id === tag);
-              filteredTags[index].count++;
-            } else if (filteredTags.findIndex(t => t.id === tag) != -1) {
-              //increment count for seen subtags
-              let index = filteredTags.findIndex(t => t.id === tag);
-              filteredTags[index].count++;
-            } else {
-              //add entry for unseen subtag
-              let t = {
-                id: tag,
-                count: 1
-              };
-              filteredTags.push(t);
-            }
-          });
-        });
-
-        this.set("filteredTags", filteredTags);
-        this.set("filteredTopics", filteredTopics);
-        this.set("filtered", true);
-      } else {
-        this.set("filteredTags", null);
-        this.set("filteredTopics", null);
-        this.set("filterTags", null);
-        this.set("filtered", false);
-      }
-    }
+  @computed("filterTags")
+  filtered(filterTags) {
+    return !!filterTags;
   }
 });

assets/javascripts/discourse/routes/knowledge-explorer.js.es6

@@ -1,8 +1,18 @@
 import { ajax } from "discourse/lib/ajax";
 
 export default Ember.Route.extend({
-  model() {
-    return ajax("/knowledge-explorer.json");
+  queryParams: {
+    filterTags: {
+      refreshModel: true
+    }
+  },
+  model(params) {
+    if (params.filterTags) {
+      const tags = params.filterTags;
+      return ajax(`/knowledge-explorer.json?tags=${tags}`);
+    } else {
+      return ajax("/knowledge-explorer.json");
+    }
   },
 
   setupController(controller, model) {
@@ -10,6 +20,5 @@ export default Ember.Route.extend({
       tags: model.tags,
       topics: model.topics
     });
-  },
-
+  }
 });

assets/javascripts/discourse/templates/knowledge-explorer.hbs

@@ -1,26 +1,13 @@
 <div class="knowledge-explorer">
   <div class="knowledge-explorer-filter">
-    {{knowledge-explorer-search searchResults=searchResults searchTerm=searchTerm filteredTags=filteredTags}}
+    {{knowledge-explorer-search searchResults=searchResults searchTerm=searchTerm filterTags=filterTags}}
   </div>
   <div class="knowledge-explorer-browse">
-    {{#if filteredTags}}
-      {{knowledge-explorer-tag-list
-          tags=filteredTags
-          filterTags=filterTags
-      }}
-    {{else}}
-      {{knowledge-explorer-tag-list
-          tags=tags
-          filterTags=filterTags
-      }}
-    {{/if}}
-    {{#if filtered}}
-      {{#if filteredTopics}}
-        {{knowledge-explorer-topic-list topics=filteredTopics}}
-      {{else}}
-        <div class="no-result">No results match the current filter</div>
-      {{/if}}
-    {{else if hasSearchResults}}
+    {{knowledge-explorer-tag-list
+        tags=tags
+        filterTags=filterTags
+    }}
+    {{#if hasSearchResults}}
       {{#if emptySearchResults}}
         <div class="no-result">{{i18n 'search.no_results'}}</div>
       {{else}}