Add internal tool to preview feed configs (#18544)

* Add internal tool to preview feed configs

* Update app/services/articles/feeds/variant_query.rb

app/controllers/admin/tools_controller.rb

@@ -22,6 +22,27 @@ module Admin
       redirect_to admin_tools_path
     end
 
+    def feed_playground
+      return if params[:config].blank?
+
+      begin
+        config_json = JSON.parse(params[:config])
+        config = Articles::Feeds::VariantAssembler
+          .build_with(catalog: Articles::Feeds.lever_catalog, config: config_json, variant: "test")
+        @user = User.find_by(username: params[:username]) || current_user
+        @feed = Articles::Feeds::VariantQuery.new(
+          config: config,
+          user: @user,
+          number_of_articles: params[:number_of_articles] || 25,
+          page: 1,
+          tag: nil,
+        )
+        @articles = @feed.more_comments_minimal_weight_randomized.to_a
+      rescue KeyError, JSON::ParserError, ActiveRecord::StatementInvalid => e
+        flash[:danger] = e.message
+      end
+    end
+
     private
 
     def handle_dead_path

app/models/articles/feeds/variant_assembler.rb

@@ -88,7 +88,6 @@ module Articles
           reseed_randomizer_on_each_request: config.fetch("reseed_randomizer_on_each_request"),
         )
       end
-      private_class_method :build_with
     end
   end
 end

app/services/articles/feeds/variant_query.rb

@@ -25,8 +25,6 @@ module Articles
         new(config: config, **kwargs)
       end
 
-      # Let's make sure that folks initialize this with a variant configuration.
-      private_class_method :new
 
       Config = Struct.new(
         :variant,

app/views/admin/tools/feed_playground.html.erb

@@ -0,0 +1,33 @@
+<h1>Feed Playground</h1>
+<div class="crayons-card p-6 my-6">
+  <%= form_tag feed_playground_admin_tools_path do %>
+    <div class="form-group">
+      <%= label_tag :config %>
+      <%= text_area_tag :config, params[:config], placeholder: '{"description": ..., "order_by": ..., etc.}', class: "block w-100 mb-4 rounded", style: "height: 300px" %>
+      <%= label_tag :username, "User" %>
+      <%= text_field_tag :username, params[:username] || current_user.username, placeholder: "sloan" %>
+      <%= label_tag :number_of_articles %>
+      <%= text_field_tag :number_of_articles, params[:number_of_articles] || 25, placeholder: "25" %>
+      <%= submit_tag("Preview feed") %>
+    </div>
+  <% end %>
+</div>
+
+<% if @user && @articles %>
+  <h1>Feed Preview for <a href="/<%= @user.username %>">@<%= @user.username %></a></h1>
+  <div>
+    <% Follow.follower_tag(@user.id).includes(:followable).order("points DESC").each do |follow| %>
+      <a href="/t/<%= follow.followable.name %>" class="crayons-tag">
+        <span class="crayons-tag__prefix">#</span><%= follow.followable.name %>: <%= follow.points.round(3) %>
+      </a>
+    <% end %>
+  </div>
+
+  <div class="articles-list mt-4" id="articles-list">
+    <div class="substories" id="substories">
+      <% @articles.each do |article| %>
+        <%= render "articles/single_story", story: article.decorate, featured: article.main_image.present? %>
+      <% end %>
+    </div>
+  </div>
+<% end %>

config/routes/admin.rb

@@ -132,6 +132,8 @@ namespace :admin do
     resources :tools, only: %i[index create] do
       collection do
         post "bust_cache"
+        get "feed_playground"
+        post "feed_playground"
       end
     end
 

spec/requests/admin/feed_playground_spec.rb

@@ -0,0 +1,78 @@
+require "rails_helper"
+
+RSpec.describe "/admin/advanced/tools/feed_playground", type: :request do
+  describe "GET /admin/advanced/tools/feed_playground" do
+    context "when the user is not an admin" do
+      let(:user) { create(:user) }
+
+      before do
+        sign_in user
+      end
+
+      it "blocks the request" do
+        expect do
+          get feed_playground_admin_tools_path
+        end.to raise_error(Pundit::NotAuthorizedError)
+      end
+    end
+
+    context "when the user is a super admin" do
+      let(:super_admin) { create(:user, :super_admin) }
+
+      before do
+        sign_in super_admin
+        get feed_playground_admin_tools_path
+      end
+
+      it "allows the request" do
+        expect(response).to have_http_status(:ok)
+      end
+    end
+
+    context "when the user is a single resource admin" do
+      let(:single_resource_admin) { create(:user, :single_resource_admin, resource: Tool) }
+
+      before do
+        sign_in single_resource_admin
+        get feed_playground_admin_tools_path
+      end
+
+      it "allows the request" do
+        expect(response).to have_http_status(:ok)
+      end
+    end
+
+    context "when the user is the wrong single resource admin" do
+      let(:single_resource_admin) { create(:user, :single_resource_admin, resource: Article) }
+
+      before do
+        sign_in single_resource_admin
+      end
+
+      it "blocks the request" do
+        expect do
+          get feed_playground_admin_tools_path
+        end.to raise_error(Pundit::NotAuthorizedError)
+      end
+    end
+  end
+
+  describe "POST /admin/advanced/tools/feed_playground" do
+    context "when the user is a super admin" do
+      let(:super_admin) { create(:user, :super_admin) }
+
+      before do
+        sign_in super_admin
+        post feed_playground_admin_tools_path, params: { config: "sddsdsdsdsds" }
+      end
+
+      it "allows the request" do
+        expect(response).to have_http_status(:ok)
+      end
+
+      it "shows proper error" do
+        expect(response.body).to include("unexpected token at")
+      end
+    end
+  end
+end