Show valuation comment thread @ Valuation show/edit

Why:

Budget Investment's valuators should be able to see internal valuation
comments thread at both show and edit views.

How:

At Valuation::BudgetInvestmentsController:
* Include CommentableActions to gain access to the entire feature, with
required resource_model & resource_name methods.
* Add the only possible order (oldest to newest)
* Load comments on both show & edit actions, passing `valuations` flag
to the CommentTree in order to only list those.

At CommentTree:
* Use `valuations` flag as instance variable to decide wich
comment threat to load: valuations (if relation exists) or comments.

app/controllers/valuation/budget_investments_controller.rb

@@ -1,11 +1,14 @@
 class Valuation::BudgetInvestmentsController < Valuation::BaseController
   include FeatureFlags
+  include CommentableActions
+
   feature_flag :budgets
 
   before_action :restrict_access_to_assigned_items, only: [:show, :edit, :valuate]
   before_action :load_budget
   before_action :load_investment, only: [:show, :edit, :valuate]
 
+  has_orders %w{oldest}, only: [:show, :edit]
   has_filters %w{valuating valuation_finished}, only: :index
 
   load_and_authorize_resource :investment, class: "Budget::Investment"
@@ -36,8 +39,30 @@ class Valuation::BudgetInvestmentsController < Valuation::BaseController
     end
   end
 
+  def show
+    load_comments
+  end
+
+  def edit
+    load_comments
+  end
+
   private
 
+    def load_comments
+      @commentable = @investment
+      @comment_tree = CommentTree.new(@commentable, params[:page], @current_order, valuations: true)
+      set_comment_flags(@comment_tree.comments)
+    end
+
+    def resource_model
+      Budget::Investment
+    end
+
+    def resource_name
+      resource_model.parameterize('_')
+    end
+
     def load_budget
       @budget = Budget.find(params[:budget_id])
     end

app/views/valuation/budget_investments/_written_by_valuators.html.erb

@@ -51,3 +51,11 @@
   <h2><%= t("valuation.budget_investments.show.internal_comments") %></h2>
   <%= explanation_field @investment.internal_comments %>
 <% end %>
+
+<div class="tabs-panel is-active" id="tab-comments">
+  <% unless @comment_tree.nil? %>
+    <%= render partial: '/comments/comment_tree', locals: { comment_tree: @comment_tree,
+                                                            comment_flags: @comment_flags,
+                                                            display_comments_count: false } %>
+  <% end %>
+</div>

app/views/valuation/budget_investments/edit.html.erb

@@ -103,6 +103,14 @@
   </div>
 <% end %>
 
+<div class="tabs-panel is-active" id="tab-comments">
+  <% unless @comment_tree.nil? %>
+    <%= render partial: '/comments/comment_tree', locals: { comment_tree: @comment_tree,
+                                                            comment_flags: @comment_flags,
+                                                            display_comments_count: false } %>
+  <% end %>
+</div>
+
 <h1><%= @investment.title %></h1>
 
 <%= safe_html_with_links @investment.description %>

lib/comment_tree.rb

@@ -4,16 +4,24 @@ class CommentTree
 
   attr_accessor :root_comments, :comments, :commentable, :page, :order
 
-  def initialize(commentable, page, order = 'confidence_score')
+  def initialize(commentable, page, order = 'confidence_score', valuations: false)
     @commentable = commentable
     @page = page
     @order = order
-
+    @valuations = valuations
     @comments = root_comments + root_descendants
   end
 
   def root_comments
-    commentable.comments.roots.send("sort_by_#{order}").page(page).per(ROOT_COMMENTS_PER_PAGE).for_render
+    base_comments.roots.send("sort_by_#{order}").page(page).per(ROOT_COMMENTS_PER_PAGE).for_render
+  end
+
+  def base_comments
+    if @valuations && commentable.respond_to?('valuations')
+      commentable.valuations
+    else
+      commentable.comments
+    end
   end
 
   def root_descendants