#70 #72

backend/app/models/post_tag.rb

@@ -1,6 +1,6 @@
 class PostTag < ApplicationRecord
   belongs_to :post
-  belongs_to :tag
+  belongs_to :tag, counter_cache: :post_count
 
   validates :post_id, presence: true
   validates :tag_id, presence: true

backend/app/models/user.rb

@@ -19,4 +19,12 @@ class User < ApplicationRecord
   def viewed? post
     user_post_views.exists? post_id: post.id
   end
+
+  def member?
+    ['member', 'admin'].include?(role)
+  end
+
+  def admin?
+    role == 'admin'
+  end
 end

backend/app/models/wiki_page.rb

@@ -8,6 +8,11 @@ class WikiPage < ApplicationRecord
 
   validates :title, presence: true, length: { maximum: 255 }, uniqueness: true
 
+  def as_json options = { }
+    self.sha = nil
+    super options
+  end
+
   def sha= val
     if val.present?
       @sha = val
@@ -18,9 +23,16 @@ class WikiPage < ApplicationRecord
     end
     vers = @page.versions
     idx = vers.find_index { |ver| ver.id == @sha }
-    @pred = vers[idx + 1]&.id
-    @succ = idx.positive? ? vers[idx - 1].id : nil
-    @updated_at = vers[idx].authored_date
+    if idx
+      @pred = vers[idx + 1]&.id
+      @succ = idx.positive? ? vers[idx - 1].id : nil
+      @updated_at = vers[idx].authored_date
+    else
+      @sha = nil
+      @pred = nil
+      @succ = nil
+      @updated_at = nil
+    end
     @sha
   end